To troubleshoot a fuel pump issue, you'll need to consult your owner's manual (or a repair manual specific to your year and model Jimmy). This will help you locate the relevant relays and fuses that *control* the fuel pump circuit, such as:
* Engine Control Module (ECM) or PCM Relays: A failing relay could prevent power from reaching the fuel pump. The manual will show you where the various engine relays are located, and you might need to test them individually with a multimeter.
* Underhood Fuse Block: Check the underhood fuse box for fuses related to the fuel injection system or engine control. Again, the owner's manual is essential here. You'll likely find fuses labeled as "EFI," "Fuel Injection," or similar terms.
* Interior Fuse Panel: While less likely, a fuse in the interior fuse panel could also be involved. Check the manual for any relevant fuses listed there.
Important: Testing fuses should be done with the ignition OFF to prevent short circuits and potential injury. If you aren't comfortable working with car electrical systems, it's best to take your Jimmy to a qualified mechanic. Improperly diagnosing and working with electrical systems can be dangerous.
