Chevrolet K1500 Suburban starter cranks for 5 seconds then shuts off, issues with fuel pump wiring on Chevrolet K1500 Suburban

Some Chevrolet K1500 Suburban owners report experiencing starting issues where the starter cranks for 5 seconds before shutting off, potentially linked to problems with the fuel pump wiring. These issues may arise from a faulty fuel pump relay, which only activates the pump briefly during cranking, leading to interruptions in fuel delivery. Additionally, monitoring fuel pressure during engine stalls is crucial, and jumpstarting the fuel pump can help identify problems within the 'fuel pump run' circuit. Some owners have also attempted to bypass the Passlock system, but this may introduce intermittent issues over time. Checking the fuel tank level is important, as the vehicle should run for a few seconds before shutting off, and tapping on the tank may indicate fuel delivery problems. Furthermore, malfunctioning components such as the cam sensor, crankshaft sensor, and ignition switch can contribute to these starting difficulties. Lastly, a theft deterrent relearn procedure may be necessary to ensure the system operates correctly, and if unsuccessful, it should be attempted again. Addressing these factors can help troubleshoot and resolve the Chevrolet K1500 Suburban's starting and fuel pump issues effectively.