Carb Problems?
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Carb Problems?
I own a 1977 F150 4x4 with a 351M. Yesterday, when I was driving home, the motor suddenly lost power and died. The only way I could restart it was to pump the pedal while cranking it, but even after restarting, the motor ran rough and would die unless I kept my foot on the gas. when the motor shut off, it sounded as though gas was pouring into the carb. I disconnected the pcv valve when I was messing around and it ran a little better and I was able to limp it home. any suggestions about what my problem might be?
MSEE
Joined: Apr 2004
Posts: 10,386
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From: Austin, TX
Sounds like some varnish got trapped in the needle seat, keeping the needle open. When this happens, it's usually time for a carburetor rebuild. Have you verified that fuel is actually pouring into the carburetor? Often times fuel will pour out from the bowl vents in this situation as well.
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when the motor initially died, the fuel in the inline filter was bubbling up, and it sounded as though the fuel was pouring into the carb and there was a bit of fuel coming out of the vents. but the only way I can start it is while pumping the gas, which seems odd if it is getting too much fuel.
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