![]() ![]() Please remember when you are doing this diagnosis that the ECM turns on the electrical power to the lift pump only for 4 seconds when the key is in the “on” or “run” position. ![]() If the engine was running BEFORE you CHANGED THE FUEL FILTER or OPENED A FUEL LINE, and it HASN’T STARTED SINCE, or, it started and stalled after doing this, and it WON’T BLEED or restart, and you can hear the lift pump running, but won’t fill the filter canister, you most likely have a bad electric lift pump. You will be very glad you did this if your truck runs again and you don’t need an injection pump! In this situation air and fuel is what you are trying to start the engine with! Pressure indicators don’t know the difference between air and fuel pressure, so they make you falsely think everything is fine. Your gauge may have just failed and be out of calibration for the first time and the tank is actually empty. ![]() We say this because of the famous Dodge fuel tank sender problem. If the fuel gauge reads 1/8 – 1/4 of a tank, put a few gallons in the tank and bleed the fuel system. You only need 12 volt power, ground, and fuel to the VP44. To make the engine start and idle only, you don't need any sensors or computers or electric lift pump. ![]()
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