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Pass Time · 06-26-2009, 10:54 PM

To make a real long story short...I have a 2005 F225 that just up and stopped running one day. Cleaned out the fuel/water separator(very full of water and crap) and engine ran great for four more days and very long fishing trips. Coming back to dock on the last trip, motor stalled at low speed after slowing for traffic and then trying to throttle up. Had to get towed in. Got motor to run by squeezing primer bulb. Heres is what we were thinking...and did. Cleaned up fuel and tank, not bad,,,replaced entire fuel line including barbed fittings, hoses, new fuel water separator and Racor filter with water drain bowl, new primer bulb and clamps, new primary filter. Checked for good flow all the way to low pressure pump and have great flow. Engine starts and runs great until VST fuel supply is used up. Thinking low pressure pump is not working and also looks really rusty I replaced it. Suspected filter cartridge may have bypassed also and let trash through the line so I also remove VST and clean tank and parts and replace high speed pump filter...it was at least 60% clogged. Everything goes back together great. After priming empty system with bulb I turn on the ignition and hear the pumps charge the system. Could actually hear the low pressure pump run for about 10 seconds. Motor cranks and runs like a top for about 15 minutes then starts to slow and stutter then tried to stop. Sqeezed primer bulb and kept motor running. Motor runs now until VST empties. Low pressure pump does not seem to be coming on any more so Iremove lines and again chase a good fuel flow all the way to the intake of the new LP pump. Nothing comes out of the output side of the new pump at all unless I squeeze the bulb. Its seems like whatever tells theVST is drained while running is not telling it to come on. I look at my manual and see that there is a low pressure pump driver in the wiring harness that seems to power th LP pump. Any of you techs out there have any good advice for someone who just spent damn near $1000on cleaning up his fuel system and still having the same problem?

PS Motor runs damn fine for the few minutes that it does run.

06-26-2009, 10:54 PM	#1
Pass Time Senior Member Snapper Join Date: Feb 2009 Location: Navarre, FL Posts: 541	need a yamaha tech To make a real long story short...I have a 2005 F225 that just up and stopped running one day. Cleaned out the fuel/water separator(very full of water and crap) and engine ran great for four more days and very long fishing trips. Coming back to dock on the last trip, motor stalled at low speed after slowing for traffic and then trying to throttle up. Had to get towed in. Got motor to run by squeezing primer bulb. Heres is what we were thinking...and did. Cleaned up fuel and tank, not bad,,,replaced entire fuel line including barbed fittings, hoses, new fuel water separator and Racor filter with water drain bowl, new primer bulb and clamps, new primary filter. Checked for good flow all the way to low pressure pump and have great flow. Engine starts and runs great until VST fuel supply is used up. Thinking low pressure pump is not working and also looks really rusty I replaced it. Suspected filter cartridge may have bypassed also and let trash through the line so I also remove VST and clean tank and parts and replace high speed pump filter...it was at least 60% clogged. Everything goes back together great. After priming empty system with bulb I turn on the ignition and hear the pumps charge the system. Could actually hear the low pressure pump run for about 10 seconds. Motor cranks and runs like a top for about 15 minutes then starts to slow and stutter then tried to stop. Sqeezed primer bulb and kept motor running. Motor runs now until VST empties. Low pressure pump does not seem to be coming on any more so Iremove lines and again chase a good fuel flow all the way to the intake of the new LP pump. Nothing comes out of the output side of the new pump at all unless I squeeze the bulb. Its seems like whatever tells theVST is drained while running is not telling it to come on. I look at my manual and see that there is a low pressure pump driver in the wiring harness that seems to power th LP pump. Any of you techs out there have any good advice for someone who just spent damn near $1000on cleaning up his fuel system and still having the same problem? PS Motor runs damn fine for the few minutes that it does run.