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Posted on Sep 15, 2009
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Not getting gas to motor on 150 efi,engine will try to turn over

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  • Expert 53 Answers
  • Posted on Nov 03, 2009
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Joined: Oct 25, 2009
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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

  • john_guiducc Apr 18, 2012

    Does engine need to be primed 40 hp merc outboard 2001 ran out of gas ?

  • john_guiducc Apr 18, 2012

    Does engine need to be primed 40 hp merc outboard 2001 ran out of gas ?

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Losing power when the lights is on of the motor electric problems
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