Engine questions - The 1947 - Present Chevrolet & GMC Truck Message Board Network

68gmsee · 12-06-2009, 02:24 PM

Good info in above posts.

fyi: it takes just a few seconds to pump enough gas to start the engine when you choked and pumping the gas pedal -even if it was empty. You're basically sucking gas out of the carb with the choke closed.

To check it take the breather off. Run it. Shut it. Look in throat to see if gas is dripping or if there's a heavy smell of gasoline fumes.

Another test. After you stop, step on the pedal all the way and leave it there without pumping it. Do not choke it and do not pump the pedal. Crank it and see if it starts quicker that way. Also, have someone look at the exhaust to see if there's black smoke coming out when it starts.

If all of that checks out and still fails to start. You may have ignition problems, vacuuum leak or vapor lock.

12-06-2009, 02:24 PM	#5
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Engine questions Good info in above posts. fyi: it takes just a few seconds to pump enough gas to start the engine when you choked and pumping the gas pedal -even if it was empty. You're basically sucking gas out of the carb with the choke closed. To check it take the breather off. Run it. Shut it. Look in throat to see if gas is dripping or if there's a heavy smell of gasoline fumes. Another test. After you stop, step on the pedal all the way and leave it there without pumping it. Do not choke it and do not pump the pedal. Crank it and see if it starts quicker that way. Also, have someone look at the exhaust to see if there's black smoke coming out when it starts. If all of that checks out and still fails to start. You may have ignition problems, vacuuum leak or vapor lock.



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