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#1
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Fuel problem, please help.
2004 Yamaha 150 carbed 2 stroke.
Above 4500 RPMs the fuel flow cannnot keep up and primer bulb starts to go soft allowing the motor to cut out. Runs smooth as silk anywhere below that. At 4500 and above someone can squeeze the ball and the motor will not cut out. Couple things - installed a new primer bulb to be sure it wasn't that. Tank pickup seems to be free flowing and clear of obstruction. Racor F/W separator a little over 1 yr old. In-line filter seems fine, clear from obstruction and trash. So, what could it be other than the fuel pump? I'm going to go ahead and replace the 2 filters anyway, but don't think it is going to help.
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 1994 Wellcraft V21 
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#2
06-28-2010, 08:18 AM
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Sounds like a hose is collapsing on you. Have you checked the tank vent for a partial obstuction. Try running motor on a seperate line/tank and see if that solves the problem. Happened to a friend of mine and it turned out the inside of the fuel hose was collapsing under high RPM's. Check the obvious/cheapest things first.
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1987 V20 1996 Jonhson 150 OceanRunner
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#3
06-28-2010, 08:27 AM
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Oh yeah, forgot to mention, checked the tank vent - no obstruction whatsoever.
I agree, I should run it on a separate tank and see what happens. If it were a line collapsing it seems I would have trouble priming the ball while my buddy is running it above 4500? I'm able to keep up and it doesn't "feel" like a fuel line problem.
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1994 Wellcraft V21
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#4
06-28-2010, 08:58 AM
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I saw the fuel line that collapsed on my friend after he replaced it. It seemd like the fuel line had a bladder in it (a hose within a hose). some parts were still intact while a small portion of it was not. That was the part that gave him the problem. Running on a seperate line/tank is the way to go now to eliminate engine itself as being the problem. Good luck!!!!!!
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1987 V20 1996 Jonhson 150 OceanRunner
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#5
06-28-2010, 09:01 AM
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Thanks Cam! I agree with you. I'll do that this evening.
For now, let's pretend I do that and still have the problem - what comes next?
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1994 Wellcraft V21
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#6
06-28-2010, 09:29 AM
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Buy a Honda?
 (Sorry, couldn't resist)...I'll keep quiet now.. 
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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#7
06-28-2010, 10:35 AM
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 Ouch!
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1994 Wellcraft V21
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#8
06-28-2010, 12:03 PM
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Where are all of the internet mechanics? Taking the day off? Hello? If I don't hear back soon I'm going to go by the Honda dealership to look see about a new motor.
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1994 Wellcraft V21
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#10
06-28-2010, 03:24 PM
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Nymack, its the same as a johnnyrude...just has a different word on the cowl! LOL
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1994 Wellcraft V21
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