Need Yamaha Gods F150 power loss

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The short of it ,Yamaha F150 four stroke.not getting full power under a load,change vst filters along with all fuel filters,no change,mechanic wants to change fuel pump next ????? Any ideas ?

 

[99yam40]

need to have it hooked up the a computor with the diagnostic software to see what it shows. but then you will need to have someone that knows what they are seeing.
also monitoring fuel pressures would be needed befor throwing a fuel pump at it to see if that does anything

 

[Mouse action]

A steady 40lbs at idle and w.o.t.....can’t be the pump.

 

[99yam40]

That was what I was getting at, if pressure stays good even when the problem shows up the a pump will not fix the problem.

do you know it that pressure was monitored when the problem showed up?
Without the YDS to look at things, the injectors being sent off for testing and cleaning is something to do. but have no idea if that will fix it

 

[robert graham]

Could be a plugged injector filter/screen.....what year motor? Have injectors ever been removed/cleaned?

 

[Mouse action]

It an 05, not sure of the history.its been fine for the 2 seasons I got it.

 

[Mouse action]

So we changed all filters,vst included clean injectiors,runs fine till gets operating temp then it won’t take fuel?

 

[Mouse action]

GODS answer ....disconnected the fuel line and squeezed bulb.tryed to squeeze the fuel out and it was rock hard???
so I cut the line open and it was deteriorated beyond belief,clogged solid,change out that cheap soft gray line for some automotive gas line .so now with a new vst filter ,new fuel filter and cleaned injectors it’s a rocket again.
thanks for all the advice. The boat earned its name “GOOD GRIEF”

 

[99yam40]

Not sure if automotive fuel line is Ok ed for marine use

 

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Same gas a car uses,so why not? Obviously the marine fuel line sucks.never had that problem in any car I’ve ever owned.

 

[Mohawkmtrs]

if anything ever happened, I'm not sure your insurance company would agree with you...just sayin'

 

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I think if you searched thru your Hull you will find automotive fuel line from your tank to the bulk head where they tie in the cheap line with the primer bulb.seen it on every boat I’ve owned.