Re: FUEL PUMP PROBLEMS?

Posted by Jim L. in OR On 2012/8/2 16:18:49
Quote:

Owen_Dyneto wrote:
If the symptoms you mention occur under quite light acceleration rather than steady speed driving, they're often associated with either a ruptured vacuum advance diaphragm in the distributor, or carburetor main jets that are undersized. The latter has been a not infrequent issue since the introduction of the 10% ethanol gasoline which exaggerates the condition and on request most of the better carburetor rebuilders will compensate for the ethanol (which creates a leaner mixture) by installing slightly larger main jets. Worked like a charm on my 56 Carib which was prone to modest surging under light throttle at road speeds. You might also check the carburetor float level.

I'm not convinced your problem is the fuel pump, why not do a pressure and flow volume test?


The thing is that even with a bad accelerator pump the car ran GREAT before the pin exodus. Another reason I suspected the pump. After it warmed up, I just couldn't believe I was driving the same car as I had before. The symptoms wouldn't show up until I was at a steady speed. any moderate change either up or down but more UP than down and it would smooth out.

I called the shop when I got home and asked "What did you do to this car?" The only thing they touched was the pivot pin (and since the pin was still hanging on, I'm not sure how much investigation of the pump was done), the carb for the "new" accelerator pump and a moderate adjustment on the choke for the hard cold start - which I've already changed back to no avail.

This morning I did go out and get the "tools" necessary to do the fuel pump test in the FSM.

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