Here's a more likely breakdown of the problem:
* Short Circuit: The most probable cause is a short circuit somewhere in the circuits protected by fuse F1. This could be in the wiring harness itself (damaged insulation, rodent damage), a faulty component connected to that circuit, or even a bad connection. The short is drawing excessive current, blowing the fuse.
* Fuel Pump Relay (less likely): While the fuel pump circuit *could* be part of what F1 protects, it's more common for a separate relay to control the pump. A faulty relay stuck closed would also draw excessive current, but typically a different fuse would blow. Check your owner's manual or a wiring diagram.
* Other Circuits: F1 likely protects other electrical components besides the fuel pump. Consult your owner's manual or a wiring diagram for your specific vehicle to see exactly what circuits F1 powers. A problem in any of these could cause the fuse to blow.
Troubleshooting Steps:
1. Check the Fuse Box Diagram: Find the wiring diagram for your 1994 Geo Tracker. This will show you *exactly* which circuits are protected by fuse F1. This is crucial before doing anything else.
2. Replace the Fuse: Before doing anything else, replace the blown 15 amp fuse with a new one *of the correct amperage*. Do NOT use a higher amperage fuse – this is a fire hazard.
3. Inspect the Wiring: Carefully examine the wiring harness and connections for any signs of damage (melting, fraying, bare wires) in the circuits shown in the diagram as protected by F1. Pay close attention to areas that might experience vibrations or heat.
4. Test the Circuits: With the new fuse in place, carefully test the electrical components protected by F1 *one at a time* to see if any are drawing excessive current. You'll likely need a multimeter for this.
5. Check for shorts to ground: Use a multimeter to test for continuity between the various wires in the circuits and the vehicle's ground. A low resistance reading indicates a short.
Only after systematically checking for shorts and eliminating other possibilities should you suspect the fuel pump itself. Replacing the fuel pump is an involved job; jumping to this conclusion without checking the easier possibilities is a waste of time and money.
