RAM 1500 Van V6-239 3.9L Magnum (1995)
Fuel Pressure Test - Typical
Connect the 0-414 kPa (0-60 psi) fuel pressure gauge (from Gauge Set 5069) to test port pressure fitting on fuel rail.
2. With engine running, note pressure gauge reading. Fuel pressure should be approximately 241-310 kPa (35-45 psi) at idle.
3. If pressure is at 0 psi, connect DRB scan tool and check to see if the relay is actuating properly. Refer to Computers and Control
Systems/Testing and Inspection/Procedures.
4. If operating pressure is above 45 psi, fuel pump is OK. Replace fuel filter/fuel pressure regulator assembly.
