225 4 stroke fuel pump and 5amp fuse

[Yamaha225]

Try this again with better spelling and shorter message:

twin Yami's 2007 LF225TXR

5amp fuse for Fuel pump is blown. Is this the low pressure fuel pump, or the injection pump(VST)?

Scale of 1-10, 10 being impossible, How hard is it to replace the low pressure fuel pump. I am a descent mechanic, been boating 15 yrs on inboards. These are my first outboards, and I do have a warranty on the engines.

[rodbolt17]

yes the f225 lift pump uses a 5 amp fuse.

[Yamaha225]

225 2007 lift pump 5amp fuse

I took the boat to a dealer. It is a mystery why the lift pumps on both engines blew the 5amp fuse within a minute of each other.

One mechanic suggested a bad relay is to blame. I will find out more today, hopefully. I am hoping that whatever happened is covered under warrantee.

I was at the dealer 5 minutes, and they already started talking about the maker of the boat, Maycraft, may be to blame for the rigging, and it may not be a yamaha dealer item.

Here we go. I smell a nightmare in the making.

How difficult is it to pull this pump off the motor and replace. I am mechanically handy, and, from the looks of it, there are just a few 10mm bolts and the hoses to take off. Will the pump, slide down past the air intake tubes? I can't see the top of the pump. I hope I don't have to disassemble the intake assembly.

[rodbolt17]

pop the air box off, remove battery cables,4 nuts,4 bolts and unplug the intake air temp sensor. unplug the VST vent and remove air box.
water in the fuel is the most common culprit of lift pump failure.

[Yamaha225]

Lift pumps shot

Dealer tells me both lift pumps are shot. He also tells me the vst pumps are still working. The culprit was a small U-fuel filter between the lift pump and the injector pump(vst). That little filter was clogged. The lift pumps were cavitating since they can't push fuel to the injector pump, causing the lift pumps to overheat and burn out.

GD ethanol!

Moral of the story so far is 2006 225 hp 4 strokes have 4 filters total. The spin on 10 micron, the 6P3 clear platic bowl with filter inside, this U-fuel filter b/w the 2 pumps, and the VST filter on the injector pump.

Hope and pray the warranty covers this.

How do I get a full repair manual for this engine? I can't have this happen out in the canyons. I need to be better educated so I can fix in a pinch.

[rodbolt17]

and each injector has a filter.
dunno about the failure theory.
would have to inspect the pumps.

[99yam40]

trash or water in fuel is not covered under warranty as far as I have heard, if that is what caused the failures.

Maybe cut the filters open to see what you find inside

Look here for manual # and then find manual where ever you can, but Yamaha dealer is one place.YAMAHA MANUAL STORE

[rodbolt17]

think about it for a while and you will see why the dealer is blowing smoke.

[mitch]

check your pm........ listen what rodbolt is saying dealer blowing smoke these pumps are about 600 each ouch

[rodbolt17]

once you get the airbox off.
follow the lift pump output.
goes to a T fitting.
from the T there is a hose that runs back to the lift pump intake.
goes through that metal canister tie strapped to the pump bracket.
the other hose goes through the horseshoe filter into the VST.
that metal canister is a check valve.
keeps VST inlet pressure at about 10 PSI.
once the VST is full and the pump is running the excess fuel is diverted through the check valve back to the pump intake.
thats why at speeds below about 1200 rpm the lift pump cycles,20 seconds off,10 seconds on.
keeps the pump from running in a stalled condition when the vst needle is closed or overwhelming the needle and flooding the intake with raw fuel through the vst vent.

[Yamaha225]

Rod bolt

The horseshoe filter was clogged. The dealer will put the new lift pumps on, and check the vst pump pressure to make sure they push 35 psi. If they don't, then they need replaced too. Should I get the check valve changed while it's all pulled apart?

Spoke to another yami dealer, he said use the ring free with fuel treatment instead of the stuff I was using, that star-brite stuff in the lite blue bottle. Your thoughts on this? That yAMA lube stuff is expensive.

[rodbolt17]

that check valve is rather expensive.
I would check it.
cant belive ANY tech would change that horseshoe filter WITHOUT going on into and cleaning the VST.
still dont belive thats what killed the pumps.
a clogged filter there would act just like a closed VST needle and the lift pump would just recirc the fuel.