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A lot of people have suggested the fuel pump might have a bad check valve.
That should be a fairly easy and inexpensive fix for this vehicle. I will try it
in the next day or so and let everyone know.
To clarify my problem a bit more: There is a clear glass inline filter
between the fuel pump and carb. It will be completely dry after a couple days of
sitting. I also remove the air breather and manually work the carb linkage but
the jets do not squirt anything. I had thought about the fuel pump check valve
causing lack of fuel in the lines but why would the carb be dry
too?
I usually only run the engine for less than 5 minutes at a time so I didn't
think it would be getting hot enough to percolate the fuel out. Don't you
usually hear hissing/popping sounds immediately after the engine is shut off
when this happens?
Thanks again for everyone's help!
Don Roberts
KC, KS
1958 Imperial x4
1967 New Yorker
----- Original Message -----
Sent: Wednesday, September 05, 2007 12:06
PM
Subject: Re: [FWDLK] Carburetor / fuel
Problems
I don't know how you
determined that all the fuel drained back into the tank after your car sits a
few days but I think it is unlikely that it is happening, I have heard of
Carburetors percolating the float chambers dry from heat but that would only
seem to affect the carbs while the engine was hot. Have you tried loosening
the fuel line at the fuel pump that goes to the carb to see if any fuel leaks
out after the car has sat long enough to have a problem starting? The one
thing I can think of that might cause the fuel lines to bleed down is leaking
check valves in the fuel pump allowing fuel to leak through the fuel pump and
back to the tank, they are just spring loaded poppet valves with phenolic disc
that seals the diaphragm chamber when it isn't activated to allow fuel to flow
by the diaphragm movement, I believe there are two inlet and two outlet valves
but there might just be one for each function, it's been a long time since I
had one apart.
John
----- Original Message -----
Sent: Wednesday, September 05, 2007
10:07 AM
Subject: [FWDLK] Carburetor / fuel
Problems
While on the carburetor topic, I have a problem that I could use some
help with on my New Yorker (440 engine-Carter 4 barrel). It generally starts
and runs good but if I let it sit for more than a couple days, it has to
pump fuel all the way up from the tank. When this happens
I generally just pour gas down the carb to prime it.
What would cause the entire carburetor, fuel pump and all the
lines to drain? Is this some sort of siphon problem? and is it from the
tank or motor? There are no leaks anywhere that I have found. I have
considered getting an inline filter with a check valve but I would really
like to find out the cause of the problem rather than just temporary fixes.
Any suggestions would be appreciated.
Thanks,
Don Roberts
KC, KS
1958 Imperial x4
1967 New Yorker
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