Original 239. Starts good. Sometimes it sits running perfectly....then just stops with no hint of trouble. Starts again with ease. Other times while driving....it will stall out when coming to a stop. Is it the fuel pump? I have Airtex low pressure pump near gas tank and use it for possible vapor lock or priming carb. Not left on. Is it OK to leave the Airtex on to see if this solves the problem?
Yes, leave it on to see what happens next. Eliminate one thing at a time. Condenser? Points? Grounds?
UOTE="Ole don, post: 11038181, member: 10367"]Yes, leave it on to see what happens next. Eliminate one thing at a time. Condenser? Points? Grounds?[/QUOTE] Ok Don...... I also was thinking of removing push rod from mechanical pump and just have the Airtex low pressure pump doing the gas feed. I think they run at 3 pounds psi.
Or flush you fuel lines. I had a Mercedes have same symptoms, mostly dying under acceleration and dying ad odd moment. Ended up being a foreign object in a fuel line, one moment out of the flow, next minute blocking the needle valve. Periodic problems is a pain in the a$$! I had bad battery cable, bad ground, cable rubbed down to almost shorting, broken motormount ( engine pulls a wire half way off) or a distributor with one weight stuck. Al sort of troubles under different conditions.
I once had a coil, had a minute crack in the side of its case, and it would ground out on the coil holder (vibration, heat, ???) - nightmare finding that one!
Its Ok if you bypass the original pump, if the original pump has a problem you may end up with a crankcase full of fuel. Whenever I have a problem I can't diagnose I just go step by step through a tune up. Usually by the time I am done I have found the problem. That said I remember once I had an old chevy truck and it ran fine most of the time but it would stall when you poured the coals to it. I beat my head against a wall until one time I had the hood open and just happened to see the rubber line the supplied the fuel pump suck flat. It happens.
My experience with similar symptoms with my own '50: I finally discovered that someone (who knows when) had dropped a small 3 inch piece of what looked like fuel or vacuum line into the fuel tank. It rode there for years before finally becoming brittle enough to start falling apart. When it did, a small sliver of it became wedged in the fuel tank outlet. The car would get enough gas to run, but the flow was erratic enough to cause all kinds of problems. I finally found it after getting disgusted enough to replace the tank and lines all the way to the carb. even blowing out the lines wouldn't have helped in my case. I had even tried a new fuel pump & carb!
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