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 MANUALSDODGE AND RAM1999DAKOTA SLT, 2D PICKUP, 3.9 X, 4WD, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISENGINE CONTROLS - BASIC ENGINE TESTING - GASOLINEFUEL SYSTEMFUEL PUMP CAPACITY TEST
1999 Dodge and Ram Dakota SLT, 2D Pickup, 3.9 X, 4WD, Standard
Fuel Pump Capacity Test
1999 Dodge and Ram Dakota SLT, 2D Pickup, 3.9 X, 4WD, StandardSECTION Fuel Pump Capacity Test
NOTE:
Perform FUEL PUMP PRESSURE TEST before performing FUEL PUMP CAPACITY TEST. Perform FUEL PUMP CAPACITY TEST in conjunction with FUEL PRESSURE LEAKDOWN TEST. See FUEL PRESSURE LEAKDOWN TEST.
- Release fuel system pressure. See FUEL PRESSURE RELEASE. Remove air cleaner housing (if necessary) to access quick-connect fuel fittings. Disconnect fuel supply line quick-connect fittings at fuel rail. Connect Fuel Line Pressure Test Adapter (6539) for 5/16" fuel lines, or Fuel Line Pressure Test Adapter (6631) for 3/8" fuel lines, to the disconnected fuel supply line.
- Insert other end of Fuel Line Pressure Test Adapter into a graduated container. Remove fuel filler cap. Using DRB scan tool, actuate ASD FUEL SYSTEM TEST. This should activate fuel pump and pressurize system. Fuel pump should deliver at least .25 L of fuel in 7 seconds. If capacity is lower than specification, but fuel pump can be heard through fuel filler, check for a kinked or damaged fuel supply line between fuel rail and fuel pump module. Go to next step.
- If fuel supply line is not kinked or damaged and fuel pressure is okay, but capacity is low, replace fuel filter/fuel pressure regulator. Fuel pressure regulator can be replaced separately on some models. If both fuel capacity and pressure are low, replace fuel pump module assembly. See FUEL PUMP MODULE under FUEL SYSTEM in REMOVAL, OVERHAUL & INSTALLATION - TRUCKS & RWD VANS - GASOLINE article.
NOTE:
DO NOT operate fuel pump for longer than 7 seconds.
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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.