Mike,
Try this:
Place an ounce or two of gas directly into the carb. The truck should fire
up and run for at least a few seconds. If it does not fire up, then the
problem may not be the fuel, I don't know. But if it does fire up and run,
but still won't restart; or if it does fire up and not run for longer than a
few seconds, then the problem is his fuel pump. A new pump with a metal top
is $18 at the FLAPS so I'd try that. It takes only about ten minutes to
replace the fuel pump.
My thought is that you are developing enough vacuum to draw the fuel into
the carb when you place your hand over the air inlet of the carb. I had a
similar problem with my '46 and it also leaked a little gas out of a small
overflow hole in the side of the pump. I rebuilt the unit and voila - the
truck started easily, ran well, and no more leaking. The diaphragm must
have been bad.
My $.02 worth.
Michael Lubitz
1946 Chevy 3/4 ton stock
1948 Chevrolet 3100, soon to be deluxe
Austin, Texas
----- Original Message -----
From: <Mikerross@aol.com>
To: <oletrucks@autox.team.net>
Sent: Sunday, December 10, 2000 7:54 PM
Subject: [oletrucks] Carb (?) Question
> Hey guys I've been trying to help a neighbor start his '54 Chevy Truck.
He's
> obviously desperate for mechanical assistance because he has asked me for
> help. Anyhow as best I can tell he seems to have a carburator problem.
>
> When he cranks the engine nothing happens, it doesn't fire. When I place
my
> hand over the carb creating a strong vacuum the engine fires almost
> immediately, I remove my hand and the engine runs for 5-10 seconds then
dies.
> It seems to be gas starved.
>
> I (and my neighbor) would appreciate any ideas you guys might have. I
also
> noticed there seems to me slight gas leakage between the carb and the
intake
> manifold. Could this leak cause the engine to suck air instead of draw
gas
> throw the carb?
>
> Could the problem be something completely different?
>
> I would appreciate any and all thoughts. Thanks in advance for the help.
>
> Thanks a lot.
>
> Mike
> '56 Chevy Truck
> oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
oletrucks is devoted to Chevy and GM trucks built between 1941 and 1959
|