Question 1

How to replace the fuel tank module (NT7) on Buick Lucerne?

Accepted Answer

Before replacing the Fuel Tank module (NT7) personnel must first follow the correct method to reduce fuel system pressure. First unfasten the rear compartment liner and fuel sender access hole cover bolts before removing the cover itself. The sender requires removal of its fuel feed rear pipe quick connect fitting after which the pressure sensor and sender get their Fuel Level Sensor wiring harness electrical connectors (1, 2) taken off. The j 45722 (Fuel Sender Lock Ring Wrench) should be used to remove the fuel sender lock ring by turning it counterclockwise while keeping the lock ring from getting damaged. Use the j 45722 to unlock and remove both the lock ring and the fuel sender assembly but ensure the Fuel Level Sensor float arm remains straight since tilting prevents bends and drain the fuel from the reservoir bucket into an approved storage container. We should remove the old fuel pump module o-ring seal for inspection while testing the lock ring for any damage that extends more than 0.41 mm (0.016 in) requires it must be replaced. Install the new fuel pump module o-ring seal onto the Fuel Tank then fit the float arm of the fuel sender while tilting the assembly before lowering it into position inside the tank. Secure the module lock ring clockwise using the j 45722 until it reaches full lock position. Reattach the Fuel Level Sensor wiring harness electrical connectors (1, 2) as well as the fuel feed rear pipe quick connect fitting. Use the correct instructions to turn the ignition on and off while verifying that no leaks exist when checking for leaks after attaching the negative Battery Cable. Conclude the process by installing the fuel sender access hole cover which needs to be bolted to 2 nm (18 lb in). Proceed by reinstalling the rear compartment liner and intake manifold cover.

Question 2

What tools are required to replace the fuel tank module on a long wheelbase on Buick Terraza?

Accepted Answer

You need to use the fuel sender lock nut wrench (J 45722) to replace the Fuel Tank module of a long wheelbase vehicle. Start by taking off the Fuel Tank followed by disconnecting wires from the Fuel Tank module. All fuel pipe and hose connections require cleaning before any disconnect procedure becomes necessary to avoid contamination. The first step is to disconnect both quick connect fittings that lead the fuel feed pipe and the evaporative emission (EVAP) pipe from their module positions. Unlock the fuel sender lock ring through counterclockwise rotation using the fuel sender lock nut wrench (J 45722) together with a long breaker-bar while draining the fuel to safe containers as a fire precaution. Extract the Fuel Tank module with its seal while disposing of the aging module seal then clean both sealing areas. Check for damage on the lock ring while also measuring its warpage against 0.41 mm (0.016 inches); perform a replacement if warpage exceeds this measurement. The installation of a new Fuel Tank module requires users to place a fresh Fuel Tank module seal on the Fuel Tank so the Fuel Pump Strainer remains untwisted and unfolded. Place the new Fuel Tank module into the Fuel Tank before securing the lock ring through clockwise rotation of the fuel sender lock nut wrench (J 45722). The procedure ends by reconnecting the evap quick connect fittings, the fuel feed pipe quick connect fitting, the Fuel Tank harness electrical connectors, and placing the Fuel Tank back in position.

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