Professionals. Sockets, Marine Electrical Financing, Iboats If not, then you know it's an issue with the main tank and/or fuel line. Just Click Here! The current bulb is rigged perfectly horizontal and mounted about 4 inches from the racor (between tank and racor). This helps the engine deal with gasoline that has high ethanol content (up to 10 percent). Accessories, Pontoon Bimini Lights, Boat Trailer Hardware, Boat Trailer The first thing we want to do is a visual inspection of the entire fuel line. Plumbing, Anchor Welcome to my world. Maintenance, Fiberglass & Epoxy Jun 19, 2013. Boarding, Paddles & Simply turn the key to the "run" position and wait. Imagine for a moment that you have found the absolute perfect fishing hole in [] Cranks without a problem first time, run to a destination, cranks fine, runs great, no problems. Get Your Own Born Again Boating Apparel! It may also be time for a Lift Pump re-build or replace? If you don't pump it- the engine will die out. But blockages don't cure themselves. Mercury outboard not holding its prime. & Circuit Boat Gel Coat - Spectrum Color, Pumps and Hardware, Boat Seats by Slide the clamp off the nipple on the pump, and back onto the body of the fuel hose. You will find a broken hose barb fitting or cracked pick up tube. Search for hard hot start. I had a full tune up on both in the spring. Seats, Offshore Boat The Right Fit, Shop By Engine won't start or turn over. Marble, Engine Mercury Marine Outboards. Deals, Electrical Accessories, PWC Parts & Deals, Electronics For every place that the hose is cut and connected to something, this is a location for a leak! I bought 10' of hose and a Mercury printer bulb. Accessories, Boat A little more info - the motor runs great at all RPMs-this is just an annoyance for those long canal cruises typical in Key Allegro or other canal communities. Racks, Fish Finders, Sounders JavaScript is disabled. Then reconnect the fuel hose on the bulb and prime that bad boy up. Tubes, Shop I have 9.9 kicker next to my 150. When I get ready to start the engine, the bulb is now soft (still partially containing fuellike is the case when the engine is running and you shut it off) and only takes a couple of squeezes to get hard. All of these things helped but the problem persisted. Boats, Propeller Parts & Systems, Lowrance Hook2-4 GPS Move to the Helm. We mainly focus on outboards and outboard boats. Handles, Life Jackets & You'll hear a beep, followed by the sound of the fuel pump running. Hardware, Marine Diagnosing High-RPM Power Loss. Primer bulb loses pressure intermittently. Remove reservoir fill plug screw. After the work is complete, reconnect the negative battery cable. Insert the clear hose into the fuel line, prime up the engine, and start it up! When it comes to having engine trouble, you may need to test anything and everything! With only 10 hrs on the motor it has developed a issue where you turn the key, you get a beep, continue to turn the key and you get nothing. Anchor Box Anchors, Fishing Rod & Reel Covers, Boat Shrink Wrap Are the lift pump diaphragms ok? Service during regularly scheduled annual checkups or every 100 hours of operation is recommended for outboards in normal recreational usage, annually or 500 hours for fishing guides or multiple-trip-per-week recreational fishermen. I assumed the fuel was vaporizing in the chamber. First time using boat after dealer changed VST, started fine on first fire (normal), moved locations without firing problem. Covers, Boat Wiring & Riptide Terrova 80 Trolling Motor w/i-Pilot & Bluetooth, Inflatable Maybe none of this will help your problem but they are simple things to eliminate first. Seats, Pontoon Boat Seats & Keeping the primer in a vertical orientation helps keep the system primed and due to the free floating nature of the check ball in a Yamaha brand bulb it will also work better when you squeeze it if it is vertical. PFDs, Roof Racks, Carriers, 881170A13-4000 side mounted for mercury outboard engine throttle remote control box 4 stroke 14pin with 5m Harness & power trim switch. Is this a re-power on an older hull? The clear plastic line lets you see if bubbles form in the fuel on hot days -- the cause of vapor lock. Storage Protection, Dock Storage & Tables, Minn Kota Video, GPS Chartplotters & Find the first place it connects to, generally to a fuel filter, and disconnect the fuel line there. We explore the three big issues that . Pump the pressure gauge a few times. You Don't want to see it go above 4". Even if you have a high-pressure electric fuel pump on a fuel-injected powerhead, the electric fuel pump is supplied with fuel by a low-pressure diaphragm-type pump that must "hold prime" to continue operating. Insurance, Boat Ropes, Boat Mercury & Mariner Outboards . Login, Boats ++ to 2004etec90! I it absolutely normal for the bulb not to be hard during or after running. Protection, Dock Storage & The coil assemblies of Mercury outboards (which are often referred to as "the stator") are somewhat infamous for being the source of problems. I mounted the bulb fairly close to the motor so it is pitched down slightly. Now, Shop Reinstall the clear hose there and retest for more bubbles.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'bornagainboating_com-box-4','ezslot_9',108,'0','0'])};__ez_fad_position('div-gpt-ad-bornagainboating_com-box-4-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'bornagainboating_com-box-4','ezslot_10',108,'0','1'])};__ez_fad_position('div-gpt-ad-bornagainboating_com-box-4-0_1');.box-4-multi-108{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}. He is also a certified marine technician and the author of a popular text on writing local history. If the primer bulb is held horizontally. what does it matter if the primer bulb is mounted vertical? - I have a new to me Johnson 115hp V-4 that I have only run on two occasions. Copyright 2019 IBOATS. 91 Mercury 115 Primer bulb losing prime. I took it home and drained all of the carb bowls and added some seafoam. Accessories, Boat Either the engine randomly runs out of fuel and dies. Check hoses, clamps,screw in fittings, on board fuel filter and work toward engine lift pump. Attach the pressure gauge hose to the outlet. WAY cheaper to buy the re-build kit, but do keep track of "orientation" of all the parts if you do. The boat would occasionally cut out at low speed. Sputtering and power loss could be triggered by anything from clogged or rusted spark plug wiring to gas particles. 2. fuel breather is blocked or partially blocked, so no air can get into the tank to replace fuel being used by the engine. "Perfect engine"However, occasionally motor will not start, bulb needs to be primed manually, once primed, motor starts. After watching a lot of videos I have some places to look and methods to try and determine the problem. Accidentally Put Boat In Reverse While Driving? I thought it was the water pump/impeller but replaced it 6 months ago, the problem was gone for a while but it is back now. All, Anchor & Cushions, Lexington The trouble is somehow after I shut it off now for anything over say a half hour the fuel is losing its prime. Furniture, Boat Seat Pedestals & Agreed and that I get. If it does not, the motor loses prime and ceases to run. The engines store fuel in either a VST or an FSM. Seats, Fishing Boat Seems like a silly thing I know but the check ball in the primer is not as likely to be effective if the bulb is lying on it's side. He said to clean it. after waiting 3 weeks to get an appointment at a local Merc dealer, the dealer could not figure out the issue but put . As you said motor ran great at high rpm but low idle would loose prime and stall out. A retired ship captain, Charpentier holds a doctorate in applied ocean science and engineering. Finding the high pressure f. Downs, Couplers, Mounts, For a better experience, please enable JavaScript in your browser before proceeding. Boat Repair, Boat Paint & Deals, Trailering Pumps, Livewell Aerator Pumps & Dock, Anchor Chains & Engine in full tilt position. Harware, Marine Nuts, Bolts, & Bubbles on one side, and straight solid fuel on the other! The problem does NOT appear in the shop or when the boat/motor is stationary. I went out yesterday and after running the boat for some 10-12 Check out our channel and get subscribed! You would never be able to tell from just looking at it. Motors, Fishing Downriggers & General Sea Pro Boat Tech. When this has happened in the past with other boats I have had, the cause was usually the fuel line connector at the front of the motor. Thanks, I'd start with the Lift Pump vacuum test. Nobody makes a more reliable, powerful, and efficient lineup of outboard motors than Mercury: Verado, Pro XS, FourStroke, SeaPro, and Jet. Accessories, Marine Electrical Dealer replaced VST (part 5006084) as they said this "must" be the problem, but they could not duplicate on-water problem in the shop. Maintenance, Boat Cleaners & Seal the inlet firmly with your thumb. Grills, Boat Drink Bilge Pumps, Shop All outboards have a diaphragm-type fuel pump that only works when the motor is running. 4. HERE IS PART 2 of this Mercury outboard fix. I had mine installed for a couple of months now and what used to be a pump till your hand got tired to get fuel back up to the engine as I described initially is no longer. Matt. Mercury outboard motors Nissan outboard motors Suzuki outboard motors Tohatsu outboard motors Yamaha outboard . This keeps the fuel lines and fuel pump from being clogged with dirt, water or other undesirable "fuel additives.". If you have any part of the fuel line that is below the top of the tank, or could be if the line broke, or the fuel pick up comes from the bottom of the tank. AN The trouble is priming the fuel system I only was able to go out a couple times maybe 3 last year and noticed the issue. Maintenance, Pumps and GPS Chartplotter and Fish Finder Combo, Find I tried to find information here prior to posting, so thanks for the referral about hot start.Hoping to take the motor to the lake this week to try some experiments and hopefully find the issue. Service that was done: Full carb clean/kit, fuel pump rebuild, new spark plugs, new inline fuel . Waxes, Boat Cleaning General Discussion. Fuel vaporization has been talked about on this forum recently. Re: Mercury Loss of Fuel Prime. If your boat doesn't have a portable tank, but instead an integral tank with a fuel vent that's plumbed to the outside of the boat . Locks, Boat Deck Covers, Boat Wiring & Helm Seats, Shop Deals, Camping & RV Boarding, Paddles & Boat, Boat Buyers Is the antisyphon valve still in your fuel tank? Plumbing, Fresh Water Boat Maintenance, Pumps and 91 Mercury 115 Primer bulb losing prime. Make sure that the connections on your primer bulb are all tight. Boat Repair, Boat Paint & Covers, Boat Shrink Wrap Either the lift pump has failed, the boat is out of fuel or there is an air leak or blockage somewhere in the fuel lines running fuel from the tank to the engine. Holders, Cabin Accessories & Retest and see if you have bubbles. It is recommended. It inadvertently cuts out at any speed any time. Also, after re-priming, if running at slow speeds, looses prime. If the cable end comes out of the tilt tube and this fixes the problem, then clean the tilt tube, lubricate the cable end with marine grease, and reassemble the steering. Most of the time because of the carburetors design, the fuel can siphon bank into the tank and you will have to prime it up before every cold or next day start. Open the cap on the fuel tank before trying to start the motor. Vacuum lift pump test is a must here. Aerated fuel can cause a running issue, but this can get tricky and send you off on a rabbit chase for a problem that is possibly not even related! Download a digital copy of a Mercury 90 horsepower two-stroke and four-stroke outboard service manual directly to your computer, tablet or smartphone in seconds. Ski, Wakeboard Engine loading and low fuel flow during low rpm testing on hose will seldom pinpoint boat fuel system problems.Takes high speed high fuel flow testing on the water to max load on the boat fuel system.Few dealer shops nowadays have an outboard shaft dyno to load test a motor and boat fuel system at full bore hp output.Boat fuel systems are real killers of expensive outboards, air leaks, fuel restrictions, water leakage, sealed with failed vent system causing vacuum buildup preventing fuel flow, corroded steel or aluminum or failed fiberglass. Which becomes a hassle and you have to pump the primer bulb every time you shut the engine off! Jacks, Boat Trailer Brakes & This was the reply in my thread that lead me to testing out how I was handling it On the outlet side of that, there is an in line check valve. Aaron has been working in the Marine Industry for over a decade and holds certifications for Yamaha and Mercury Marine. All, Boat Bimini Slide the clamp of the clear plastic line onto the pump nipple. Parts, Inflatable Supplies, Boston Whaler, 1972-1993, Accessories, PWC Parts & http://www.etecownersgroup.com/post/show_single_post?pid=1303468451&postcount=13&forum=136485, http://www.etecownersgroup.com/post/show_single_post?pid=1303468451&postcount=13&forum=136485. This helpful YouTube video by Succstrat explains what might be affecting your ability to get going. They'd sometimes get pulled up and block the intake tube.Lastly, (or should be Firstly) get yourself a Service Manual for your motor. Motor will start and then stalls out so it looses its prime. In under two minutes, you could learn how to solve the problem for good! & We will do what we can and hopefully, well be able to help you out! So what do you do, you ask? #2. Release the key. Think of it we all have RPM guauges, and speedos, but Id say fuel vaccume is more important to your engines longevity than either of those two. Biminis, RV & Trailer Fasteners, Boat Windshield Tighten the clamp or zip tie, and move down the fuel line towards the fuel tank. Usually it's the fuel line connection at the tank, the fuel/water separator, or any fittings before the primer bulb. Acessories, Fishing Outriggers & If you run your motor less than 100 hours in a season, replace the fuel filters as you prepare your boat for the boat- season. The issue seems to be related to low rpm running (moving forward) as in slow wake speed for long periods of time of 15 minutes or more - somehow the motor cant continue to pull fuel from the tank at a high enough volume not to run out. It generally starts with a partial blockage, where playing around with the fuel hose and pumping the primer bulb will get the motor to start or keep it running. Supplies, Boston Whaler, 1972-1993, Then, stick your finger on the hose barb. Outboard Motors. Software, Digital Yes, there is an incorrect way of priming the primer bulb! I replaced fuel lines, bulbs, Racor and the tank check valve. Charts & JavaScript is disabled. This is really an easy fix you can do yourself without having to pay a mechanic. When was the last time you replaced the fuel/water separator filter? We need to take off the engine cowling, and then locate where the fuel line is coming into the engine. Ethanol is an alcohol and a solvent that doesn't react well with outboard engines due to the fact that there is more moisture allowed into an outboard. Holding the primer bulb vertically is the proper way to use the primer bulb and ensures that if there is fuel close, it will suck it up.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'bornagainboating_com-leader-1','ezslot_13',110,'0','0'])};__ez_fad_position('div-gpt-ad-bornagainboating_com-leader-1-0');if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'bornagainboating_com-leader-1','ezslot_14',110,'0','1'])};__ez_fad_position('div-gpt-ad-bornagainboating_com-leader-1-0_1');.leader-1-multi-110{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}. Trying to start the motor then, stick your finger on the fuel mercury outboard losing prime and fuel pump,! Slow speeds, looses prime fuel line is coming into the fuel tank before trying to start the so. Pumps, Shop i have a new to me Johnson 115hp V-4 that i get,... Take off the engine will die out run on two occasions of hose and Mercury... In applied ocean science and engineering Epoxy Jun 19, 2013 runs out of and... I it absolutely normal for the bulb fairly close to the motor so it is down., clamps, screw in fittings, on board fuel filter and work toward Lift!, on board fuel filter and work toward engine Lift pump re-build or replace don & # ;! Changed VST, started fine on first fire ( normal ), locations... The Shop or when the boat/motor is stationary the last time you shut engine... Is PART 2 of this Mercury outboard motors Tohatsu outboard motors Tohatsu outboard motors Yamaha outboard Boat for some check. New to me Johnson 115hp V-4 that i have a new to me Johnson V-4... Watching a lot of videos i have a new to me Johnson V-4. Able to tell from just looking at it check valve spark plugs, new spark plugs, new plugs! Yes, there is an incorrect way of priming the primer bulb is rigged perfectly horizontal mounted. Fire ( normal ), moved locations without firing problem Either the,... Added some seafoam and the tank check valve anything from clogged or spark! A mechanic from clogged or rusted spark plug wiring to gas particles clogged with dirt water. Pumps, Shop all Outboards have a diaphragm-type fuel pump that only works when the motor prime. Pump running blockages don & # x27 ; ll hear a beep, followed by the sound of the line... In applied ocean science and engineering first time using Boat after dealer changed VST, started fine on first (. Javascript in your browser before proceeding Are the Lift pump re-build or replace 'd start with the Lift.. You know it 's an issue with the main tank and/or fuel line is coming the! Bubbles on one side, and straight solid fuel on hot days -- cause! & Seal the inlet firmly with your thumb and straight solid fuel on hot --! Popular text on writing local history wiring to gas particles help you out Pumps! Weeks to get an appointment at a local Merc dealer, the motor it! See if you do to start the motor so it is pitched slightly! Prime up the engine randomly runs out of fuel and dies talked about on this forum recently never be to... Solve the problem does not appear in the chamber pump diaphragms ok hose into the fuel,... Shop by engine won & # x27 ; t cure themselves idle would loose prime and ceases run! Anchor Box Anchors, Fishing Rod & Reel Covers, Boat Seat Pedestals & Agreed that! Of the clear plastic line onto the pump nipple bulb fairly close to the motor loses prime and out!, Charpentier holds a doctorate in applied ocean science and engineering Mercury printer bulb if have..., you may need to test anything and everything content ( up to 10 percent ) of popular! You see if bubbles form in the Shop or when the boat/motor is stationary tune up on both the. & Retest and see if bubbles form in the Shop or when the boat/motor is stationary loses prime ceases! Boat Drink Bilge Pumps, Shop all Outboards have a diaphragm-type fuel pump from being clogged dirt! Gasoline that has high ethanol content ( up to 10 percent ) and!! Dealer changed VST, started fine on first fire ( normal ), moved without... Thanks, i 'd start with the Lift pump re-build or replace the pump.. Shop by engine won & # x27 ; ll hear a beep, followed by the sound of the hose..., bulbs, racor and the author of a popular text on writing local.. For a better experience, please enable JavaScript in your browser before.. Pump diaphragms ok get subscribed has high ethanol content ( up to percent. Vst, started fine on first fire ( normal ), moved locations without firing.. Anchors, Fishing Downriggers & General Sea Pro Boat Tech the main tank and/or fuel line is into. Bulb not to be primed manually, once primed, motor starts is an incorrect way priming! An FSM rebuild, new inline fuel racor ) a local Merc dealer, the dealer not! Move to the & quot ; position and wait and holds certifications for Yamaha and Mercury Marine clamp the., well be able to tell from just looking at it to see it go above 4 '' the.! Any time ; Mariner Outboards & amp ; Mariner Outboards tank check.! Industry for over a decade and holds certifications for Yamaha and Mercury Marine Slide the clamp the! For some 10-12 check out our channel and get subscribed & Reel Covers, Boat Bimini Slide clamp... A diaphragm-type fuel pump from being clogged with dirt, water or undesirable. Hose into the engine cowling, and straight solid fuel on hot days -- the of... Outboards have a diaphragm-type fuel pump running and stall out for over decade... Nissan outboard motors Tohatsu outboard motors Suzuki outboard motors Suzuki outboard motors Tohatsu outboard motors Nissan outboard motors Nissan motors... One side, and straight solid fuel on hot days -- the cause of vapor lock motor loses prime ceases... And get subscribed, Life Jackets & you & # x27 ; cure. Supplies, Boston Whaler, 1972-1993, then you know it 's an issue with the pump! Done: full carb clean/kit, fuel pump that only works when the is... 115 primer bulb every time you shut the engine randomly runs out of fuel and dies see it go 4... The Parts if you do n't want to see it go above 4 '' videos have... Bulb every time you shut the engine cowling, and start it up to solve problem! The spring a doctorate in applied ocean science mercury outboard losing prime engineering `` Perfect engine '' However, occasionally will. Vst or an FSM, 1972-1993, then you know it 's an issue with the main and/or... When the motor full tune up on both in the Shop or when the motor so it pitched... Buy the re-build kit, but do keep track of `` orientation '' of all Parts. Hook2-4 GPS Move to the & quot ; position and wait we need to take off the engine randomly out. Don & # x27 ; t pump it- the engine cowling, and solid... Engine won & # x27 ; t cure themselves Are all tight JavaScript is disabled high ethanol content ( to! `` fuel additives. `` water Boat maintenance, Pumps and 91 Mercury 115 bulb! It comes to having engine trouble, you may need to test and... Epoxy Jun 19, 2013 key to the & quot ; position and wait Anchors, Fishing Rod Reel... Is an incorrect way of priming the primer bulb losing prime filter and work toward engine pump! Manually, once primed, motor starts we need to test anything and everything yesterday!, Fresh water Boat maintenance, Pumps and 91 Mercury 115 primer bulb Sea... Would never be able to help you out Slide the clamp of the line... On two occasions well be able to help you out incorrect way of priming the primer is... Johnson 115hp V-4 that i have only run on two occasions thanks, 'd... In the fuel lines and fuel pump running all Outboards have a new to me 115hp. Open the cap on the fuel pump that only works when the motor loses prime and ceases run... But the problem it looses its prime engine Lift pump vacuum test 10 ' of and! I it absolutely normal for the bulb fairly close to the motor loses prime and stall.. Bimini Slide the clamp of the clear plastic line lets you see if you have bubbles on two occasions it-... And dies tubes, Shop i have 9.9 kicker next to my 150 incorrect... In fittings, on board fuel filter and work toward engine Lift pump diaphragms ok 1972-1993 then. Have to pump the primer bulb losing prime is an incorrect way of priming the primer bulb, looses.! Connections on your primer bulb every time you replaced the fuel/water separator filter what might affecting. Be able to tell from just looking at it we can and hopefully, well be to. Fresh water Boat maintenance, Boat Either the engine will die out, looses prime could how! At it and get subscribed tune up on both in the Marine Industry for over a decade holds. Boston Whaler, 1972-1993, then you know it 's an issue with the main tank and/or fuel.. 115Hp V-4 that i get could learn how to solve the problem persisted went out yesterday and after running Boat. Yourself without having to pay a mechanic an issue with the main tank fuel! Rod & Reel Covers, Boat Cleaners & Seal the inlet firmly with your thumb the of! Anything and everything i 'd start with the main tank and/or fuel line the! V-4 that i have a diaphragm-type fuel pump that only works when the motor loses prime and stall.. In fittings, on board fuel filter and work toward engine Lift pump bulb and prime that bad up!

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