The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - Help... Starting Problems, Rough Idle, and Backfire through Carburetor

68gmsee · 10-26-2009, 10:23 AM

Three things come to mind: Try the cheaper, easiest first.

1. As mentioned above, change the filters. Inlet to the carb and any others that may have been added later.

2. Check or replace fuel pump ($15 or so). Mine did the same thing when it had a ruptured diaphragm and wasn't pumping enough gas.

3. Carb for severe flooding or choke adjustment. If it's this bad, you should have dark grayish or black smoke coming out of the exhaust. Have someone observe if you can get it started.

After this, ignition problems may be causing it as mentioned by posts above.

10-26-2009, 10:23 AM	#5
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Help... Starting Problems, Rough Idle, and Backfire through Carburetor Three things come to mind: Try the cheaper, easiest first. 1. As mentioned above, change the filters. Inlet to the carb and any others that may have been added later. 2. Check or replace fuel pump ($15 or so). Mine did the same thing when it had a ruptured diaphragm and wasn't pumping enough gas. 3. Carb for severe flooding or choke adjustment. If it's this bad, you should have dark grayish or black smoke coming out of the exhaust. Have someone observe if you can get it started. After this, ignition problems may be causing it as mentioned by posts above.