Ultimate Guide to Injection Pump Pumping Failure Troubleshooting

Brand new fuel pump assembly and the pump won't turn on, checked with the fuel line disconnected and no fuel pressure. Everything else works fine. If the spring breaks or the piston gets stuck the pump can get stuck in prime mode. Not sure if that's your problem but it's easy to check. The fuel pump relay energizes from pulses coming from the ignition module, so if its generating pulses the fuel pump is pumping. Not 100 ... The problem was the pump lost it's prime. Any air trapped in the lines or bowl would be pumped harmlessly back into the fuel tank through the ... If you did have fuel coming out of the return line the supply side is probably working and there is a delivery issue. Likely problem areas would ... A GENTLE tap on the side of the injection pump (while cranking over the engine) can sometimes free the little plunger and get it working again. If it's not pumping fuel there is a shadetree fix that will fix it about 75% of the time. There is a check valve where the return line goes into ... Whenever the fuel injector pump's O-rings or ball seats are defective, the timing of the fuel transfer process is disrupted. This is a common ... Disconnected fuel line by carbs to lower resistance, ticks continuously but will not pick up fuel. Took off fuel line filler cap, tried again. No luck. I think whats happening here is the pump is going into prime mode.But the ECM is getting an incorrect start signal which is shutting down the ECM.