Re: [FWDLK] Carburetor / fuel Problems
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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
 
 
----- Original Message -----
Sent: Tuesday, September 04, 2007 10:58 PM
Subject: Re: [FWDLK] Carburetor Problems

    With the engine off take off your air cleaner and look down the throat
of the carburetor and manually open the throttle with the linkage and see if
there is a stream of fuel shooting into the throat of the carburetor, if
not, you need to change the cup on the accelerator pump or spread it so it
works properly, that will probably cure your problem.
John
----- Original Message -----
From: "Ron Waters" <ronbo97@xxxxxxxxxxx>
To: <L-FORWARDLOOK@xxxxxxxxxxxxx>
Sent: Tuesday, September 04, 2007 8:51 PM
Subject: [FWDLK] Carburetor Problems


> Hi Gang -
>
> Carburetors baffle me. The shop manual is so riddled with techno-speak
> that
> I've read the carb section about five times and still don't understand the
> five systems discussed. Here's the problem I'm hoping someone out there
> can
> help me with:
>
> My Newark-built 58 Plymouth has a Stromberg 2bbl carb. Car starts and
> idles
> great. While in Neutral, I can step on the gas and rev the engine just
> fine.
> The problem is, once the car is allowed to warm up, when I put it in gear
> and step on the gas, it stumbles and usually stalls. This necessitates a
> restart, which is difficult. The engine just cranks.
>
> OK, carb detectives, help me solve this mystery.
>
> Thanks,
>
> Ron
>
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