Buick 20887143 Tank Assembly, Fuel

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Any repairs to the fuel tank or filler neck should always be entrusted to a professional with expertise in this crucial and potentially hazardous task. Even after thorough cleaning and flushing of the fuel system, there is still a risk of explosive fumes lingering and igniting during tank repairs. If the fuel tank is removed from the vehicle, it is imperative to avoid placing it in an environment where sparks or open flames could come into contact with the fumes emitted by the tank. Particular caution should be exercised in garages that house gas-type appliances, as they have the potential to cause a dangerous explosion.

To remove the fuel tank, start by relieving the fuel system pressure and detaching the cable from the negative terminal of the battery. If the tank is full, use a hand-operated pump to remove as much fuel as possible. Then, drain the tank through the filler neck. Loosen the lug bolts for the left rear wheel, raise the vehicle, and remove the wheel. Inside the wheel well, remove the cover and loosen the hose clamp securing the fuel tank filler neck. Disconnect the EVAP hose, fuel supply and return lines, and any sensor links. Remove the exhaust system and rear suspension support assembly if necessary. In the trunk, remove the spare tire cover, jack, and carpeted rear compartment floor trim. Remove the access plate and disconnect electrical connectors and quick-connect fittings. Support the tank with a floor jack and plywood, then remove the bolts securing the tank straps. Lower the tank and disconnect any remaining connections before removing the tank. To install, simply reverse the removal steps.