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 Fuel check valve

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Arnie1964
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PostSubject: Fuel check valve   Thu Jul 26, 2012 6:19 pm

It looks like I am going to have to buy a fuel filter with a flow check valve in one end. The blue beast sits more then 8 hours the fuel bleeds back out of the carb and fuel filter. Prime the carb she fires right up or turn it over enough times to get the fuel back and she starts. After sitting move the accel by hand and no fuel so the carb is empty also. Once she starts she runs fine. Never seen this issue before.

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PostSubject: Re: Fuel check valve   Thu Jul 26, 2012 7:06 pm

I had a 58plym wagon that would do exactley the same thing, the previous owner had installed a little fuel pump to just prime it after it sat ,id just hit the switch then turn it back off once it started kinda like an auxillary pump.it was a poly 2bbl
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PostSubject: Re: Fuel check valve   Thu Jul 26, 2012 7:53 pm

My Old GMC Pick-up done that till I put a electric fuel pump on it. Smile

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PostSubject: Re: Fuel check valve   Thu Jul 26, 2012 7:55 pm

58plym wrote:
My Old GMC Pick-up done that till I put a electric fuel pump on it. Smile
The ol Thermoquads were bad about that, You had to replace a couple of o rings in them where they wouldn't drain down. Smile

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PostSubject: Re: Fuel check valve   Thu Jul 26, 2012 9:08 pm

Jim,
That is caused by a fuel pump that has either dried out, or is beginning to fail. There is an inlet and outlet check valve in the pump, when these internal valves don't seal well, they will allow fuel to siphon back towards the tank.

---John

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PostSubject: Re: Fuel check valve   Thu Jul 26, 2012 9:18 pm

Much Goodo advise John, Your the man!!!!!!!!!!!! Very Happy

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PostSubject: Re: Fuel check valve   Fri Jul 27, 2012 6:48 am

Thanks John. That is probably the last thing I would have worked on in my progression to get it fixed. Car was stored for years so it makes sense. I will get a new pump and change it out first.

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PostSubject: Re: Fuel check valve   Fri Jul 27, 2012 1:20 pm

More than welcome, Jim!

The additives in todays fuel were added to reduce emissions, but they also cause fuel to evaporate at a much faster rate. These older fuel systems are vented, and if you let your car set unused for several weeks, the fuel in the carburetor will evaporate, causing hard starting as well.

This will not occur overnight or in a couple days, however.

---John

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