1981 Chevy Malibu with a 305 cubic inch engine with a two-barrel Carburetor. While driving at approximately 40-55 MPH engine suddenly loses power (no sounds/as if stalled). As the speed falls below 40, the engine kicks back on. This repeats if trying to accelerate again. I have replaced the fuel pump, rebuilt the carburetor, and changed the distributor and coil. While "power-braking" the engine, the fuel enters the carburetor for about one minute then the engine dies. It acts as if it is starving for fuel. Could a hose collapse from the fuel tank cause this condition? If not, what could?
Check for fuel in the carburetor when the engine dies after power braking to isolate the problem to the fuel system. Some possible causes include: 1. Cracked fuel hoses at the tank of pump, 2. Partially plugged fuel pick-up filter in the gas tank, 3. Incorrect gas tank cap causing a vacuum in tank, 4. Alternator diode failure allowing AC voltage to ignition coil. (Try test-driving with the alternator disconnected.), 5. Faulty ignition module in Distributor.
dave's big backyard!
February, 3, 2011 AT 1:52 AM
The one thing I need to know is if you pump the gas pedal will it take off again? If so then it sounds like your carb, sometimes a rebuild dont work.