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Yamaha v4 1991 115hp outboard fuel pump failure

How to test, diagnose and replace.

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Remove fuel pump and check the diaphrams have not perished and valves are seated on housing ! But first try while engine is running if you prime the bulb does it keep running , if yes then pump not priming fuel !

Posted on Jul 10, 2014

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Posted on Jan 02, 2017

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I have a 1978 merc 85 hp outboard with a bad pump i purchased a used one that works mine has 4 hoses


Mercury Outboard Fuel Pump - Mercury Outboard Forums

forums.iboats.com/Mercury-Outboards/Fuel-Pump
5, 2004 Mercury 225 four-stroke EFI no power to Low Pressure fuel pump. Why please help · Mercury & Mariner Outboards. 13, Mercury 850 (85hp) - Gas pumps through the top carb - Failed fuel pump? ... 1, 1969 7.5 H.P. Mercury (Bad fuel Pump)? ... 1971 · 1972 · 1973 · 1974 · 1975 · 1976 · 1977 · 1978 · 1979 · 1980 · 1981 ...

Fuel Pump Diaphragm replacement Mercury outboard 110 ...

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My last test run of this motor lead me to believe I had fuel pumpissues...so in ... Mercury 9.8 h.p. 110 Outboard Motor WaterPump Repair and ...

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Dec 01, 2015 | Boating

1 Answer

What causes fuel pump failure on a Yamaha tdm 900?


Hi, Anonymous the following is a systematic procedure for diagnosing fuel pump issues designed to keep "DRACHMA" to a minimum. If you need parts check with Amazon and eBay first to keep costs down.
1. If your pump does not turn on check the pump fuse and relay and all wiring including connectors for corroded, broken, or loose pins/sockets.
1. Normal fuel pump pressure is 3-5 PSI.
2. Check any rubber or plastic tubing for age-related pinholes by removing and plugging the ends that connect to the fuel valve and then turn on the ignition switch and watch for fuel streams exiting the pinholes, if any exist, replace tubing as necessary.
3. Check for a clogged a primary fuel filter that comes off the bottom of the pump to screen out big rocks and clean as necessary.
4. Check for a clogged secondary fuel filter that's outside if applicable by removing it from the system and replace it with a short splicing tube turn on the ignition switch and recheck fuel pressure if pressure increases to normal pressure you need a new secondary filter.
5. If all the above check out OK and the pump is not functioning properly then you need a new fuel pump.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
Symptoms of Bad or Failing Fuel Pump YourMechanic Advice Yamaha TDM Riders Page 105
http://www.yamaha-tdm.cz/download/5PS1_AE1.pdf
OEM parts for Yamaha
YAMAHA TDM900 Owner Manual

May 31, 2014 | 2002 Yamaha TDM 900

1 Answer

Yamaha 200hp 2001 manual


  1. Fuel
    • A common problem with an easy solution, Yamaha boat engine trouble could arise due to inadequate levels of fuel or engine oil. All Yamaha outboards take unleaded gasoline as a main fuel source with a pump octane rating of 86 or higher. The type of engine oil varies according to motor size and can be found in the "Specifications" section of a particular outboard's owner's manual (See Resources).
    Electrical
    • Problems with the electrical system can also prevent a Yamaha outboard's engine from working correctly. Troubleshoot the electrical system, first removing the main fuse that's located underneath the electrical panel on any electric-starting outboard. If the connection at the center of the fuse is broken, it must be replaced by a fuse of the same amperage. The battery should also be removed, cleaned and fully charged when troubleshooting the electrical system.

    Spark Plugs
    • Owners should also remove and inspect the spark plugs during the troubleshooting process. If the insulator tip of any plug is burned, that spark plug should be replaced. The number and type of spark plug depends on the specific outboard. Additionally, owners should ensure that each spark plug gap is set to the width stipulated in the owner's manual (see Resources).

Jan 20, 2013 | Motorcycles

1 Answer

Yamaha outboard 150 4 stroke bad vibration at 700 to 1200 rpm run great in nuetral and over 1200 rpm what could it be


is you propeller bent? a dent the size of a quarter will cause a shake. If not that means your engine is misfiring. here are the troubleshooting test and tool list you need to find out. Tools(1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local outboard dealer. I know all these are expensive but if your going to be a outboard tech you will always need them. Troubleshooting (1) check compression. without the year model I'm giving you a average numbers. Look at your Clymer manual. all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark. use a spark gap tester all cylinders should jump a half inch gap. if you have good compression and good spark, fuel is the problem nine times out of ten.Ethanol gas is proven to stay stable in fuel systems for 30 days in 90 + degree heat. Drain gas tank,clean fuel lines replace primer bulb and replace all fuel filters. Yamaha has a gravity filter under engine coul clean it. Finally replace spark plugs, I know spark plugs probably don't look bad but this is a outboard. Fresh spark plugs means less resistance for the ignition system. The ignition system is week compared to automotive. Test drive boat, if the problem is still there then there is further steps to take. Again I don't know the year model so I guessing its fuel injected. Pull out your clymer manual. what is great about the Clymer Manual for Novice techs is it gives detailed info on your outboard. Troubleshooting tips and teaches you how your outboard works.

Nov 03, 2009 | Boating

1 Answer

Yamaha 115 will not shut off with key or kill switch


not enough information on the motor. what year and model? but all yamaha outboards are shut down by the C.D.I. being grounded by the key switch or the emergency kill switch. the cheapest thing to test or replace is the key switch and the emergency kill. with more info on engine I can help you further.

Sep 23, 2009 | Light Outboard Motor Boat Bass Fishing...

1 Answer

Not getting gas to motor on 150 efi,engine will try to turn over


need year and make? Tools(1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local dealer). I know all these are expensive but if your going to be a outboard owner you will always need them. Troubleshooting (1) check compression. without the year and make I'm giving you a average numbers. Look at your Clymer manual for specific specs. all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark. use a spark gap tester all cylinders should jump a half inch gap. if you have good compression and good spark, fuel is the problem nine times out of ten .Ethanol gas is proven to stay stable in fuel systems for only 30 days in 90 + degree heat. Drain gas tank,clean fuel lines replace primer bulb and replace all fuel filters. Yamaha has a gravity filter under engine cowl clean it. Finally replace spark plugs, I know spark plugs probably don't look bad but this is a outboard. Fresh spark plugs means less resistance for the ignition system. The ignition system is week compared to automotive. Test drive boat, if the problem is still there then there is further steps to take. Again I don't know the make so I guessing what fuel injected system. Pull out your clymer manual. what is great about the Clymer Manual for Novice techs is it gives detailed info on your outboard. Troubleshooting tips and teaches you how your outboard works. without the test information I would guess the electric fuel pump. but test everything first because a mercury efi fuel pump will set you back 600.00

Sep 15, 2009 | Nitro Boating

3 Answers

40hp 1987 yamaha outboard motor will run for 30-60


Sound like the fuel pump is not keeping up with the engine's demand. Check it out. Good luck. Hope this helps.

Apr 27, 2009 | Boating

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