1978 Chevy 1/2 ton Truck - fuel is not getting to fuel pump. We changed the fuel pump, and aux. switch. Truck ran for five miles then stalled. Checked line after pump replacement, fuel fine, drove, fuel stopped flowing.

On the front of the carburetor where the fuel line comes in is the fuel filter.Did you change that?Take off that line and slip the end into a container,coffee can size.Have a friend turn over the motor,watch for fuel.If you get fuel your needle and seat have seized in the closed position.No fuel check the rubber lines that hook to the fuel pump.You replaced the pump,it's only $2 worth of rubber hoses.If they don't seal the pump can't pull the fuel,it's cheap insurance.

Hello. I recommend that you change the fuel filter and replace the gas cap. Both or either of these could solve your problem.

It sounds like the fuel line is clogged. or you are out of gas