G5 L4-2.2L (2007)
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Inspect the fuel system for damage or external leaks before proceeding.
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Verify that adequate fuel is in the fuel tank before proceeding.
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The fuel pump relay may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.
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Before proceeding with this test, review the User Manual CH 48027-5 for Safety Information and Instructions.
1. Ignition ON, engine OFF, command the fuel pump relay ON with a scan tool. You should hear the fuel pump turn ON and OFF.
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If the fuel pump does not operate, refer to Fuel Pump Electrical Circuit Diagnosis. See: Computers and Control Systems/Testing and
Inspection/Component Tests and General Diagnostics
2. Ignition OFF, all accessories OFF, install a CH-48027. Refer to Fuel Pressure Gage Installation and Removal.
3. Ignition ON, engine OFF, command the fuel pump relay ON with a scan tool. Verify the fuel pressure is between 345-414 kPa (50-60 psi) and
does not decrease more than 34 kPa (5 psi) in 1 minute.
Circuit/System Testing
Important:
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The fuel pump relay may need to be commanded ON a few times in order to obtain the highest possible fuel pressure.
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DO NOT start the engine.
Ignition ON, engine OFF, command the fuel pump relay ON with a scan tool and observe the fuel pressure gage while the fuel pump is operating.
Verify the fuel pressure is between 345-414 kPa (50-60 psi).
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If the fuel pressure is greater than the specified range, replace the fuel pump fuel reservoir pump fuel strainer orifice.
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If the fuel pressure is less than the specified range, test, inspect, and repair the items listed below. If all items test normal, replace the fuel
pump and the fuel pump fuel reservoir pump fuel strainer orifice.
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Restricted fuel feed pipe
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Restricted or plugged fuel filter
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Restricted or plugged strainer
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Inspect the harness connectors and the ground circuits of the fuel pump for poor connections.
2. Verify that the fuel pressure does not decrease more than 34 kPa (5 psi) in 1 minute.
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If the fuel pressure decreases more than the specified value, perform the following procedure:
1. Ignition OFF, relieve the fuel pressure. Refer to Fuel Pressure Relief. See: Fuel Filter/Fuel Pressure Release/Service and Repair/Fuel Pressure
Relief
2. Disconnect the chassis fuel feed hose from the engine compartment fuel pipe.
3. Install the J 37287 between the chassis fuel hose and the engine compartment fuel pipe.
4. Open the valve on the J 37287.
5. Ignition ON, command the fuel pump relay ON with a scan tool and bleed the air from the CH-48027.
6. Command the fuel pump relay ON with a scan tool.
7. Close the valve on the J 37287.
8. Monitor the fuel pressure for 1 minute.
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If the fuel pressure decreases more than 55 kPa (8 psi) within the specified time, replace the fuel pump and the fuel pump fuel reservoir
pump fuel strainer orifice.
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If the fuel pressure does not decrease more than 55 kPa (8 psi) within the specified time, locate and replace the leaking fuel injector(s).
3. Relieve the fuel pressure to 69 kPa (10 psi). Verify that the fuel pressure does not decrease more than 14 kPa (2 psi) in 5 minutes.
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If the fuel pressure decreases more than the specified value, replace the fuel pump.
4. Operate the vehicle within the conditions of the customer's concern while monitoring the fuel pressure with the CH-48027. The fuel pressure
should not drop off during acceleration, cruise, or hard cornering.
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If the fuel pressure drops off, test, inspect, and repair the items listed below. If all items test normal, replace the fuel pump and the fuel pump
fuel reservoir pump fuel strainer orifice.
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Restricted fuel feed pipe
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Restricted or plugged fuel filter
