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.
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HOMESERVICE MANUALSJEEP1999WRANGLER SE, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGFUEL SYSTEMFUEL PRESSURE RELEASE
1999 Jeep Wrangler SE, Standard
Fuel Pressure Release
1999 Jeep Wrangler SE, StandardSECTION Fuel Pressure Release
- Remove fuel fill cap. Fuel filler tube contains a spring-loaded door, located below fuel fill cap, which is used to seal fuel tank if fuel cap is not properly tightened. Using a non-metallic object, depress flap to relieve tank pressure.
- Remove fuel pump relay from Power Distribution Center (PDC). For relay location, refer to label on PDC cover. Start engine and run until it stalls. Attempt to restart engine until it will no longer start. Turn ignition off.
- Disconnect wire connector from any injector. Using a jumper wire with alligator clips, attach one end to either injector terminal. Attach other end of jumper to positive battery terminal.
- Connect one end of another jumper wire to other injector terminal. Momentarily touch other end of jumper wire to negative battery terminal for no more than a few seconds.
- Place a shop rag below quick-connect fitting at fuel rail. Disconnect quick-connect fitting at fuel rail. Reinstall fuel pump relay. Using scan tool, erase any DTCs caused by removing fuel pump relay.
CAUTION:
DO NOT use the following steps to relieve fuel pressure from fuel lines as excessive fuel will be forced into cylinder. Perform the following steps after completing steps 1)
and 2)
.
CAUTION:
Powering an injector for more than a few seconds will permanently damage injector.
RENDER: 1.0x
NO RELATED
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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.