HowToRepairGuide.com: how to replace fuel pump on Pontiac grand AM?

The fuel pump is located inside the gas tank, and the tank must be removed first. Once removed it's pretty straight forward. I have included the instructions below.

--------------------

the first thing to do is disconnect the neg battery cable ,this will stop any unintended voltage to the pump assembly,if the tank has less than 1/2 a tank ,you will need to take off the filler tube(hose at the tank)first ,spray some penatrating fluid on the bolts or nuts that hold the straps and loosen the bolts to about 3/4 of the way ,disconnect the fuel pump connector to the tankand diconnect the lines and vapor hose now take off the filler hose at the tank and smaller vapor hose too if you have a compressor then you can insert a 3/8 hose in the filler hose inlet and on the end that is hanging out ,blow the air over and outward from the hose this will create a vacumn to siphon the gas out ,either put it in a gas can or you can even use clean 5 gal buckets,onced drained then lower the tank by taking out one of the bolts that hold the straps on ,you can put a floor jack under the take and remome the other bolt,now there will be a ring holding the fuel pump assembly to the tank ,blow off any dust or dirt at the ring spray some lubricating spray on the ring and tank and with a small hammer and punch tap the retaining ring counter clock wise to remove the ring from its locking position ,once removed take the assembly out of the tank and replace the pump ,there will be instructions with the new pump ,install is reverse of these instructions ,there are really no special tools needed,jack the car up about untill you have like 6-8 inches under the rear tires and secure the car on jack stands (always)I think that $800 is a little steep for this job unless they are replacing the hole fuel pump assembly ,the fuel pump is usually around 40-60 dollars and the labor is usually around 1.5-1.7 hours ,just use common sense and the life of a pump cannot really be said it depends on the climate(cold or hot)if the tank is cleaned and changing the fuel filter at least once every year.

REMOVAL:

Relieve the fuel system pressure, refer to FUEL SYSTEM PRESSURE RELIEF.Drain the fuel tank, refer to DRAINING FUEL TANK.Raise the vehicle on a hoist.Remove the fuel filler hose from tank.Grasp the fuel sender feed tube and in-line fuel filter quick-connect fitting. Twist the quick-connect fitting 1/4 turn in each direction to loosen any dirt within the quick-connect fitting. Repeat for other fitting.Blow the dirt from the quick-connect fittings with compressed air.Disconnect the quick-connect fittings:Squeeze the plastic tabs of the male end connector and pull the connection apart. Repeat for other fitting.Disconnect vapor hose from connection (at front of tank).Remove rubber exhaust pipe hangers to allow exhaust system to drop slightly.Remove exhaust pipe heat shield bolts and heat shield.With aid of an assistant, support tank, and remove front fuel tank strap attaching bolts and 2 retaining fuel tank straps. CAUTION: DO NOT bend the fuel tank retaining straps, as this may damage the straps.Lower tank enough to disconnect fuel sender electrical connector and remove the retaining clips.Remove vapor hose from fuel sender assembly.Remove Vapor hose from vapor pipe (at rear of fuel tank).Remove fuel tank from vehicle. NOTE: If it is necessary to remove rust or burrs from the fuel level meter tubes: use emery cloth in a radial motion with the tube end to prevent damage to the O-ring surface.Using a clean shop towel, wipe off the male tube ends.Inspect all tube ends for dirt and burrs. Clean or replace components/assemblies as required.Inspect fuel line O-rings for cuts, nicks, swelling or distortion. Replace if necessary.

INSTALLATION:

With the aid of an assistant, position and support the fuel tank. Position the fuel tank retaining straps and front attaching bolts loosely.
Connect vapor hose to vapor pipe (at rear of tank).
Connect vapor hose to fuel sender assembly.
Connect fuel sender electrical connector and install retaining clips.
Install rear fuel tank strap attaching bolts and tighten front and rear bolts to 47 N-m (35 lb. ft.).

WARNING: To reduce the risk of fire and personal injury: Before connecting the fuel lines, always apply a few drops of clean engine oil to the male tube ends. This will assure proper reconnection and prevent a possible fuel leak. (During normal operation, the O-rings located in the female connector will swell and may prevent proper reconnection if not lubricated.)

To connect fuel sender feed pipe to in-line fuel filter. Quick-connect fittings:Apply a few drops of clean engine oil to the male connector tube ends.Push the connector together to cause the retaining tabs/fingers to snap into place.Once installed, pull on both ends of each connection to make sure the connection is secure.Repeat for the other fitting.Reconnect the vapor hose to vapor pipe (at front of tank).Install fuel filler vent hose to fuel tank.Install the fuel filler hose to fuel tank.Install heat shield and attaching screws.Install rubber exhaust pipe hangers.Lower vehicle.Add fuel and install fuel filler cap.Connect the negative battery cable.Turn the ignition switch to the "ON" position for two seconds, then turn it to the "OFF" position for ten seconds. Again turn the ignition to the "ON" position and check for fuel leaks.