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 SAHARA, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGFUEL SYSTEMFUEL PUMP AMPERAGE TESTWRANGLER
1999 Jeep Wrangler Sahara, Automatic
Fuel Pump Amperage Test: Wrangler
1999 Jeep Wrangler Sahara, AutomaticSECTION Wrangler
- Perform FUEL PRESSURE TEST and FUEL PUMP VOLUME TEST before performing this test. If fuel pressure and fuel volume are okay, ensure fuel tank has fuel. If fuel tank is empty or near empty, amperage readings will be incorrect. Ensure fuel tank temperature is more than 50°F (10°C).WARNING: With ammeter installed in place of fuel pump relay, fuel pump will be activated even with ignition off. Before connecting ammeter, ensure all fuel lines and fuel system components are connected.
- Remove fuel pump relay from Power Distribution Center (PDC). See Figure . Set ammeter to 10-amp scale. Connect negative lead of ammeter to terminal C9 (Dark Green/White wire) at fuel pump relay socket in PDC. See Figure . Connect positive lead of ammeter to terminal C10 (Dark Green/Black wire) at fuel pump relay socket in PDC.
- If fuel pump current draw is 10 amps or more, replace fuel pump module. See FUEL PUMP MODULE under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION article. If fuel pump current draw is less than 10 amps, fuel pump module is okay.
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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.