This forum is great what did we do before the internet
? Thanks everyone for taking the trouble to reply and keep them coming. To clarify a few answers:
The fuel goes from the tank to the fuel shut off valve to the primary fuel filter to the electric
fuel pump(this is part of the Yanmar engine and seems to be used instead of a manual lift
pump) to the secondary fuel filter to the high pressure pump to the injectors then the excess back to the tank via the fuel return line.
Originally Posted by never monday
The leak is between the inlet on the Yanmar and the high pressure pump most likely.
Do I understand correctly you think the leak is most likely between the electric fuel pump
and the high pressure pump?
"a yanmar guy at the bar (I bought) he explained that some have problems with the height of the fuel tanks
and some after sitting a bit the fuel will slightly back syphen. Causing it to quickly start then dieing after 5 seconds or so"
This sounds exectly like my problem. I will try operating the lift pump before starting as a tempary fix, but I hope that this is not necessary long term. The lift from the fuel tank
is not excessive, indeed the generator sits above the main engine and manages to lift the fuel twice the height.
"Ran fine for about 10 minutes then died"
I think this may be a slightly different problem. Mine will start then die a few seconds later.
"It would start right up as normal but would run so rough at idle"
I think this may also be a slightly different problem my engine idle has always been very smooth.