2004 F225 blowing fuel pump(s) and fuse

[doubledup]

Here is the deal, I have a 2004 F225, 3700 hrs, about 1000 hrs on new powerhead. I had to replace my fuel pump (low pressure) for the first time about 4 weeks ago. New fuel pump lasted about 3 hrs the started blowing fuses (5amp), bought a used pump ad had the same results while waiting on a replacment from yamaha to cover the $650 new pump. I have searched through past threads about this same issue ad really can't find a solution to the problem. My mechanic said he cleaned the vst filter, replaced all fuel filters, and changed the fuel/water seperator before installing the new pump that lasted 3hrs. I replaced my fuel line and primer bulb about 6 months ago for prevenative mantaince. I'm at a loss as to why these 2 new pumps would blow fuses and burn up when my last pump lasted 3700 hrs, mostley with ethanol fuel.

Can someone who has been through this please respond with a solution. Thanks!

[99yam40]

not real sure what is going on, but I would monitor the inlet vacuum and output pressure and maybe check for air getting into the system

[mitch]

ouch

check what pressure you have on the low pressure pump should be 10 psi there is a relief valve that regulates it .
see number 1 on link below

these pumps are do not take much to jam up and blow the fuse most likely a bit of something has jammed it up you can sometimes get them going again.

http://www.boats.net/parts/search/Ya...202/parts.html

[weschott71]

Same Problem

I have the same engine; it has about 650 hours on it and I just started blowing the fuse and the engine will not start now; I took it to a shop this morning. I will let thme know to check the LP pump and maybe take it apart to check for crap in the lines or pump; any further information you received?

thaks for any information you may have. I will start replacing fuel lines this winter to get rid of the old hoses E-fuel problamatic.

[Finisher]

just on a whim on the port side of the engine in the front of the bottom cowl there is a black connector with 3 red wires with yellow tracers just disconnect that connector and check for burns or wiggle it and see if it cuts the motor out. worth a shot.