Fuel Pressure Test
WARNING:
ALWAYS release fuel pressure before disconnecting any fuel injection-related component. DO NOT allow fuel to contact engine or electrical components.
NOTE:
After each repair procedure has been completed, reconnect all components.
- Release fuel pressure. See FUEL PRESSURE RELEASE . Remove fuel pressure test port cap. Install fuel pressure gauge with hose on fuel pressure test port.
- Start engine, allow it to reach operating temperature. Fuel pressure should be 44.2-54.2 psi (305-373 kPa). If no fuel pressure exists and engine will not start, fuel pump relay and control circuit may be defective. See FUEL PUMP CONTROL CIRCUIT .
- If engine runs but fuel pressure is less than specified, check for kinked or damaged fuel line between fuel pump module and fuel rail. Repair fuel line as necessary and retest. If fuel line is okay, perform FUEL PUMP AMPERAGE TEST , FUEL PUMP VOLUME TEST and FUEL PRESSURE LEAKDOWN TEST . If specifications were not met for FUEL PUMP AMPERAGE TEST, FUEL PUMP VOLUME TEST or FUEL PRESSURE LEAKDOWN TEST, replace fuel pump module. See FUEL PUMP MODULE under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - DAKOTA & DURANGO article. If fuel pressure exceeds specification, fuel pump is okay, but fuel pressure regulator is defective. Replace fuel pressure regulator. Fuel pressure regulator is incorporated with the fuel filter. Fuel filter/fuel pressure regulator is located on top of fuel tank, in fuel pump module. See Fig 1 and Fig 2 . See FUEL FILTER/FUEL PRESSURE REGULATOR under FUEL SYSTEMS in REMOVAL, OVERHAUL & INSTALLATION - DAKOTA & DURANGO article.