Ben came over today and was trying to use the fuel pump to pump out the
tank preparatory to getting it cleaned. Even without a filter could only
get a tiny stream. Tried a couple other fuel pumps. One ran but would not
pump anything, even blowing into the tank. The other one pumped a great stream,
even through a supposedly plugged filter. So I conclude that we have wiped out
a fuel pump. We'll put a cheap transparent filter between the tank and the
pump and see how that does. But I have a question:

What happens to a positive displacement pump so that it runs but doesn't
pump? I haven't torn them down yet but am wondering if the superfine
reddish brown rust might have worn them to where the clearances are too
great to put up any pressure. Maybe the soft end plates have gouges worn
(or polished) in them?

Let me know what you think and I'll let you know what I find out.
--
George Downs, Bartlesville, Oklahoma, Central US