I show testing ot see if the fuel pump check valve has failed causing a extended cranking time. The idea of a check valve is to hold rail pressure, lower fuel system priming time, and. As a general rule, the check valve should be located after the fuel pump.
Jan 20- My check valve isn’t (as I lose pressure as soon as the pump stops). With ignition at position (accessory) the fast and furious fuel pressure . A mechanical fuel pump has a two-port check valve, one that is located on the pump’s inlet and one that is located on the pump’s outlet. Is there a check valve or non-return valve in the fuel delivering system somewhere? Compare costs, read reviews, and get the best deals on aftermarket or replacement Fuel Pump Check Valve. Free Shipping on all qualified orders!
The other problem can be the fuel pump check valve, as saabsite suggest. Sounds like the Crankshaft Position Sensor perhaps if you aren’t . Do not replace unless you put a fuel pressure gauge to CK for . Fuel Pump Check Valve (Again) Silverado Car Forums.
