Remove cap from pressure test port located in fuel rail. See Fig 1 . Connect Fuel Pressure Gauge (J-34730-1 ) to pressure fitting.
Start vehicle. Pressure should be approximately 31 psi (2.1 kg/cm² ) with vacuum hose connected to pressure regulator and approximately 39 psi (2.6 kg/cm² ) with vacuum hose removed from pressure regulator.
Check fuel pump flow rate. A good fuel pump will deliver at least one liter of fuel per minute with fuel return line pinched off. If fuel pump does not pump adequately, inspect fuel system for a plugged fuel filter or filter sock.
Fuel pump flow rate can be checked by connecting one end of an old A/C gauge hose to fuel test port on fuel rail and inserting other end of hose into a container of at least one liter or more capacity.
Run fuel pump by installing a jumper wire between diagnostic connector terminals D1-5 and D1-6 (located on right wheelwell, behind relay block). See Fig 1 . Be sure to pinch off fuel return line or majority of fuel will be returned to fuel tank.

Fig 1: Fuel Pressure Regulator, Fuel Rail & Fuel Injectors

Courtesy of CHRYSLER MOTORS.

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.

Safety Warning

Fuel System Test