Yamaha VZ150TLRY Loss of fuel pressure

nazbom

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Apr 28, 2013
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So I've been losing power at all RPM's but it start while cruising. I've checked about everything under the cowling per the Yamaha Service manual and the problem still persists. So I hooked it up to YDS and hit the lake. When the failure happensI notice both the Medium pressure and the High pressure pumps fall below value and power immediately drops. I've replaced the VST filter, the filter in the clear bowl, the Med Pressure filter, fuel priming bulb, spark plugs and Low Pressure pumps. Tomorrow I am tearing into the fuel lines and tanks to check them. One thing I did notice is tht the clear fuel bowl with the filter is now running withthe fuel level about 1-2" below the top and occasional air bubbles in the fuel in there.

Any ideas as to what is at issue? I've been chasing this for two weeks, mainly after work and such, three lake tests with YDS and all the same results after changing filters, LP pumps, primer.

VZ150TLRY= 2000 Yamaha VMax 150 HPDI
 
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