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[GMCnet] Hi again, but need some help [message #354977] Thu, 21 May 2020 18:32 Go to previous message
tmaki is currently offline  tmaki   United States
Messages: 200
Registered: September 2005
Karma:
Senior Member
It's been a while since I was an active participant, but I've kept up
with the list for the whole time. Just haven't been goofing around with
the GMC except to run it once a month or so, and put a few inches on the
new tires moving it around the driveway. Too busy bulking up the
retirement investments. Now that I have crossed the threshold of my
Biblical allotment of time, I figure it's worth getting back to the GMC
projects.

I have an urgent problem for which I can't remember the solution. And
combing through the hundreds of thousands of archived words from the
list and other sources just doesn't seem like fun. So here goes -- I'll
try to keep the syllable count as low as possible (I won't go into the
detail with each item).

-- I have both electric (EP) and mechanical (MP) fuel pumps (plumbed in
the "classic" way, electric pushing through the mechanical). I use EP to
prime carburetor (that's another project).

-- Last time I ran the GMC, engine missed and sputtered and puked out
horrendous smoke. Turned off (but probably not quickly enough) - hasn't
been run since.

-- Thinking EP punched a hole or tear in MP diaphragm, I drained oil.
Yielded about 2-1/2 gallons of lovely gasoline-scented oil (or was it
oil-tinted gasoline?)

OK, GMC veterans know the story. I'm replacing the MP this weekend.
That's not the problem. What I need is a plumbing arrangement to bypass
the output of the EP around the MP. I seem to recall some years ago
someone had come up with a solution. I've sketched something out using
tees and a couple of check valves, but the routing would do Rube
Goldberg proud.

I'm open to suggestions. I would love to have a dual electric setup, but
that is not in the cards right now. I need to get this engine running at
least as well as it did before (which was actually quite good). With
115,000+ miles, I may be looking at some other major fixes, so the fuel
pump luxury will have to wait. How I miss the music only an Olds 455 can
make.

So, there you go. I'll take whatever medicine is prescribed, although a
Ron White quote might be appropriate.

Sidebar note: I occasionally get requests for the Onan maintenance video
with Duane Simmons. It is still available, and will be as long as I have
the digital master.

Thanks for any help. I'm glad to be able to participate again with the
GMC family.


Toby "sure hope my engine isn't hosed" Maki

73 Glacier 230
Riverside, CA





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