I have a problem with the fuel pump on my M38A1. It started with me
finding a crankcase with a lot of gas in it (California additives ate the
rubber in the pump). I was still able to start it, to move it around the
yard, out of the way. I went out a couple of days ago to start it again
and it wouldn't. I replaced the pump and the new one wouldn't pump either.
I checked the throw on the arm and the dimensions and they were the same (
I went with a NAPA aftermarket). As a last resort, I put my finger in
where the arm goes and manually turned the engine to see if I had movement
on the lobe. It appeared that it would come up a little bit, and maybe
fall back before coming all the way up. But it wasn't an obvious egg-type
shape. It didn't feel like it had a lot of wear on it or a groove from the
old pump. Should I feel an obvious up and down of about the same magnitude
as the throw of the pump arm? How is the lobe connected in with everything
else? Off the cam I imagine, but then why does the engine start if I prime
the carb, if the cam chain or ? is bad? Eventhough the pump is a
differential type, I primed it with fuel to see if that would help, and it
didn't. Any help would be greatly appreciated. I imagine that I will have
to drop the pan and take a look up there, but would like to have some
advise as to what I am looking for before I take it appart.
Thanks,
Sean
53 M38A1
51 M135
67 M416
MVPA 14222
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