Re: [FWDLK] Carburetor / fuel Problems

[Ray Jones <hurst300@xxxxxxxxxxxx>]

Next time, try parking it with the gas cap off or at least loose. You 
may be pulling a vacuum in the tank while driving, which will try t 
pull the gas back when it pump stops. The tank should have been vented 
back then.
Ray


On Sep 5, 2007, at 2:55 PM, mrdonr@xxxxxxxxxxx wrote:

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 -----
> From: John McCann
> To: mrdonr@xxxxxxxxxxx ; L-FORWARDLOOK@xxxxxxxxxxxxx
> 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 -----
> > From: mrdonr@xxxxxxxxxxx
> > To: L-FORWARDLOOK@xxxxxxxxxxxxx
> > 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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