Re: Fuel pump and filter mystery

On Oct 30, 8:22 am, "Roger Long" <stri...@xxxxxxxxxxxx> wrote:
It's a Yamaha 2QM20. The bottom of the tank is above the engine fuel pump
but the fuel line was run to about level with the top of the engine. The
primary Racor 200 (discontinued) used to be fairly high but I moved it down
to the bottom front of the engine bed where it is easy to inspect and
replace. The electric pump has always been there but I'm going to look
carefully at the system this winter and see if I can eliminate it by
rerouting the fuel lines. I would still keep an electric pump for bleeding
and in case the diaphram on the engine driven pump fails.

I presume the 2qm20 is a pretty close cousin to my Yanmar 2gm20's. If
so, the fuel pump is a simple thing and, assuming you can get to the
side of the engine, no big deal to remove and service. It does have a
little priming lever on it and you could crack the output fuel line
and give it a couple of pumps to see if it is functional. If the
diaphragm is leaking enough to break the pump you should be making
some oil. In good condition I'd think it could do the job w/o the
electric pump.

Anyway, you've got a lot of filer area for a little engine and I
wonder if you could really foul it all up enough to stop the engine
without having some pretty visible junk in the filters. I have a
suspicion that the electric fuel pump might be the problem. Do you
suppose the electric pump could have failed in such a way as to
restrict the fuel flow? Or, maybe the pump is covering up an air leak
in the fuel line and when it failed you got air in the system...

By the way, how the heck have you used 200 gallons of fuel in a
season?

-- Tom

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