Engine not starting

[boatbod]

Originally Posted by Scout 30

Just wondering, how does a fuel pump get fouled with oil?

I presume he means injector pump and a seal failed, allowing crankcase oil into the unit.

[Stu Jackson]

[QUOTE=Scout 30;2470140]

Originally Posted by DeepFrz

The electrical pump should be on the outlet side of the Racor(?) fuel filter. Between the filter and the on engine filter.

I'd like to know why that's recommended because I am not a mechanic & can always learn something. I've had the electric pump before the dual racors in my last 2 boats because after a filter change the pump is not sucking air, it pressurizes the lines so any leak is easy to find & in an emergency the motor will run even with a small leak in the fuel line as long as the pump is before the leak. I should note that I normally leave the pump turned off.

The pump should be after the primary filter because the filter is there to filter stuff out. There is usually a small filter in the bottom of the pumps. You do NOT want that small filter to be your primary filter. Pumps can suck as well as push. They will draw fuel through the primary filter. Any air gets expelled through the bleeding process.

[boatbod]

The 3JH4E electric fuel pump is part of the engine, hence it would be located after the Racor but before the engine filter.

[DeepFrz]

I'm wondering if we have been told the whole story here.

[Captsteve53]

We all(yes even me!) need to be more careful when stating FUEL PUMP in order of clarity either say Lift Pump or Injection pump other wise it;s Apples and Oranges ,

Now an Injection pump can get black oil in it from a leaking main shaft seal into the front gear case- BUT saying that it's normally the other way around- fuel leaking into the engine oil,

The lift pump can also be contaminated from a seal/diaphragm issue as it also has parts of the pump exposed to the engine internal oil- Again how ever it normally leaks fuel into the oil rather than the other way around,


Cheers Steve

[Scout 30]

Originally Posted by Captsteve53

We all(yes even me!) need to be more careful when stating FUEL PUMP in order of clarity either say Lift Pump or Injection pump other wise it;s Apples and Oranges ,

Now an Injection pump can get black oil in it from a leaking main shaft seal into the front gear case- BUT saying that it's normally the other way around- fuel leaking into the engine oil,

The lift pump can also be contaminated from a seal/diaphragm issue as it also has parts of the pump exposed to the engine internal oil- Again how ever it normally leaks fuel into the oil rather than the other way around,


Cheers Steve

I think you're right here. The lift pump is normally always called the fuel pump but in this case I think we're probably talking about the injector pump.