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Posted by dave horvath on Thursday, April 03, 2008 at 22:37:45 :
I am stumped. I was driving Wendel (1954 C3-PW126) a few weeks ago. After filling the tank and stopping at a car wash, the truck stalled out. I could get it to run for 30 seconds or so, and it quit. Then could not get it to run at all. There was no water in the distributor. I had it towed home. The next day, same thing. It would run for 30 seconds and quit. The fuel pump bowl was full. The pump was delivering one good splash through the line to the filter bowl, then nothing.
I have tried everything I can think of. I removed the gas cap to make sure there was no pressure lock. I blew out the gas lines to make sure they were clear, since I recently had some silicone break loose from the sending unit gasket and clog the line. We thought maybe the diaphragm was bad in the fuel pump and pumping gas into the engine block. I removed the pump and hand-pumped the lever with good results. The arm on the pump was worn. I replaced the pump with a spare pump, but got no gas in the filter bowl at all. I blew out the filter. I tried it without the filter. I checked the needle valve in the carb and replaced the gasket at the needle valve. I switched back to the old carb.
Nothing has worked. I've got fuel in the line to the pump, but virtually nothing coming out with either pump. The truck will start if I pour gas down the carb, then nothing.
At this point, I'm thinking maybe the cam shaft lobe is worn to the point where it won't operate the pump arm any more. I've heard you can use JB Weld to build up the cam shaft, but I'm hesitant. Or maybe it's the wear on the first pump arm and the second pump is no good. I'm open to suggestions.
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