Crossfire SRT-6 V6-3.2L SC VIN N (2005)
Fuel Pressure: Testing and Inspection
Fuel Pump Pressure Test
Use this test in conjunction with the Fuel Pump Capacity Test, Fuel Pressure Leak Down Test and Fuel Pump Amperage Test.
The Fuel Pump contains a one-way check valve to prevent fuel flow back into the tank and to maintain fuel supply line pressure (engine warm) when
pump is not operational. It is also used to keep the fuel supply line full of gasoline when pump is not operational. After the vehicle has cooled down, fuel
pressure may drop (cold fluid contracts), but liquid gasoline will remain in fuel supply line between the check valve and fuel injectors. When the Electric
Fuel Pump is activated, fuel pressure should immediately rise (1-2 seconds) to specification.
The Fuel System is equipped with a separate Fuel Pump mounted to the chassis along side of the Fuel Filter/ Pressure Regulator. The Fuel Filter/Pressure
Regulator is not controlled by engine vacuum.
WARNING: THE FUEL SYSTEM IS UNDER CONSTANT FUEL PRESSURE EVEN WITH THE ENGINE OFF. BEFORE
DISCONNECTING FUEL LINE AT FUEL RAIL, THIS PRESSURE MUST BE RELEASED.
1. Remove the protective cap and connect the 0-6.9 bar fuel pressure gauge (2) to the fuel rail service test port pressure fitting (1) on the fuel rail (3).
The DRB III(R) Scan Tool, the 34.4 bar pressure transducer, and the transducer-to-test port adapter may also be used in place of the fuel pressure
gauge.
2. Start and warm engine and note pressure gauge reading. Fuel pressure should be 3.7 - 4.1 bar (54 - 60 psi) at idle.
3. If engine runs, but pressure is below 3.7 bar (54 psi), check for a kinked fuel supply line somewhere between fuel rail (3) and fuel pump. If line is
not kinked, but specifications for either the Fuel Pump Capacity, Fuel Pump Amperage or Fuel Pressure Leak Down Tests were not met, replace
the fuel pump.
4. If operating pressure is above 4.1 bar (60 psi), electric fuel pump is OK, but fuel filter/pressure regulator is defective. Replace fuel filter/pressure
regulator.
5. Install the protective cap to the service test port pressure fitting (1) on the fuel rail.
