Fuel Delivery Unit -GX1- / Fuel Pump Control Module -J538-, Testing: General Description

The Engine/Motor Control Module -J623- informs the Fuel Pump Control Module -J538- the demand needed for fuel volume and pressure and activates the Transfer Fuel Pump -G6-. The Transfer Fuel Pump -G6- transfers fuel to the rest of the fuel system, where it is monitored by the Engine/Motor Control Module -J623- through sensors, and controlled through regulators and/or metering valves.

Note the Transfer Fuel Pump -G6- is also known as the Fuel Delivery Unit -GX1-.

The Fuel Delivery Unit -GX1- contains the following components:

• Transfer Fuel Pump -G6-.
• Fuel Level Sensor -G-.

The Fuel Delivery Unit -GX1- components cannot be serviced separately, and they must be serviced as a unit.

Special tools and workshop equipment required 

• Multimeter.
• Wiring Diagram.
• Scan Tool.