Diagnose and Repair Injection Pump Pumping Problems like a Pro

There are 2 possibilities for your problem. One is that your injector pump has slipped on the tapered cog at the front and the second is that ... You have of course opened the fuel stop-cock. One of the commonest problems is a tiny air-leak somewhere along the supply line before the pump, ... 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. 1999 - 2006 (GMT800) - 03 silverado 2nd brand new fuel pump not pumping fuel - I changed out old pump with a new one and it would turn on ... I would make sure the filter and fuel lines are staying fully primed and not sucking air somewhere. See if the check valve is working on top of the injection ... Turning to the key to the on position will turn fuel pump on for a couple of seconds to prime fuel rail. It will not keep fuel pump running. Take the lines off the injection pump. take the stop solenoid off, remove the spring and the "pill", then put the rest of the stop solenoid back on. Several things, including a failed pump, a clogged filter, or a kinked or blocked fuel line, can cause this. If your car is not getting enough ... It requires an amount of hydraulic "head" to prime the check valves and then to pump liquid uphill to the carbs. This is a positive displacement diaphragm pump. Bleed the fuel system per the manual - if you have one. If the pump is indeed bad it can probably be rebuilt. A local shop was able to rebuild ...