Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1990 Volkswagen Vanagon Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Fuel Pump Relay (Fox)
- Ensure fuel pump fuse (No. 13) is okay. Remove fuel pump relay. Note terminals numbers molded on fuse/relay panel. With ignition on, check for battery voltage between the following locations:
- Terminal No. 46 and ground
- Terminal No. 48 and ground
- If voltage is not present, current is not reaching the relay. Repair wiring. Check fuel pump operation. If voltage is present, check for battery voltage between the following locations:
- Terminals No. 48 and No. 50
- Terminals No. 46 and No. 50
If voltage is not present, terminal No. 50 (ground circuit) is open. Repair wiring. Check fuel pump operation.
- If voltage is present, check for battery voltage between terminals No. 50 and No. 51. If voltage is not present, the ignition signal is not reaching fuel pump relay. Repair wiring. Check fuel pump operation.
- If no faults can be found and fuel pump operates when relay is by-passed, replace fuel pump relay. For fuel pump and fuse number/location, see FUEL PUMP RELAY & FUSE NUMBER table.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.