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you have to drop the gas tank to get to the fuel pump which is on top of the fuel tank. disconnect all fuel and vent lines to the tank and the electrical connectors, then disconnect the fuel filler tube that you put gas into your car. disconnect the tank straps with something under the tank to support the weight and lower the tank. clean the area around the fuel tank unit then turn the lock ring then remove the tank unit.
Although I have never personally removed the fuel tank from a 1999 Chevy Lumina, on most sedans you must first RELEASE THE FUEL PRESSURE FROM THE FUEL SYSTEM (follow standard safety precautions in doing so)*, hoist the vehicle on a lift, position a support under the tank, then undo the two fuel tank straps to free the tank. Once the tank is free, CAREFULLY maneuver the tank out of place, and disconnect the pressure line, return line, gauge lines, and vapor line from the top of the tank, before lowering the tank fully from the vehicle. It is also recommended that you siphon as much fuel out of the tank before proceeding to reduce the weight of the tank.
*A good way to relieve the fuel pressure in the system is to either remove the fuse for the fuel pump or disconnect the inertial switch in the trunk so that the fuel pump cannot engage. Once you have disabled the fuel pump, start the vehicle. Once it stalls and cannot be restarted, the pressure has been relieved from the fuel system. NOTE: You will need to cycle the ignition key several times after you have finished your work, in order to restore fuel system pressure, prior to being able to restart the vehicle.
In a 97 lumina sedan, you have to drop the fuel tank. this is tricky in that the wiring harness and fuel lines have to be disconnected before removal. the lines can be tough because the fuel filter has a compression fitting on one end and a quick disconnect fitting on the other end. The compression fitting may be rusted solid and you can't use a torch on it. ok.. the how to. First try to empty the tank. second, using jack stands and blocking the front wheels, get the car up as high as you possibly can. Disconnect the fuel filler tube from the tank. loosen (do not yet remove) the tank straps and get some room to see the top of the tank. carefully disconnect the wiring harness from the pump/sensor unit. disconnect the fuel pressure and return lines. check your clearances and make sure you have it all disconnected. carefully position a floor jack under the tank. support the tank gently. remove the tank straps, drop the tank and bring it out you will see the pump assy and a ring that has tangs on it on the top of the tank. using a hammer and (preferrably) a brass drift push the ring to the left (counter clockwise) and as it loosens just unscrew it and pull out the pump. remember that the pump and the sending unit are an assembly. treat it gently if you plan on saving it! while you're there, be sure to replace that fuel filter!!! put it back in the way you got it out good luck! Please rate my answer so I get points for it.
Properly relieve the fuel system pressure, as outlined earlier.
CAUTION Fuel injection systems remain under pressure, even after the engine has been turned OFF. The fuel system pressure must be relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury.
If not already done, disconnect the negative battery cable.
Raise and safely support the vehicle with jackstands.
Safely drain and remove the fuel tank assembly as outlined later in this section.
Detach the quick-connects from the fuel sender assembly and remove the fuel lines.
Using tool J 35731, or an equivalent spanner wrench, remove the fuel sender lockring.
Lift the sender assembly carefully out of the fuel tank.
Remove the sender O-ring from the top of the sender and discard.
WARNING Do NOT run the fuel pump unless it is submerged in fuel. Running the pump dry will cause serious damage to the fuel pump and may cause the pump to explode due to the oxygen in the air.
Note the position of the fuel pump strainer on the fuel pump and, while supporting the pump assembly in one hand, twist the strainer off the pump and discard the strainer.
Detach the fuel pump electrical connector.
Remove the clamp from the fuel line at the top of the pump.
Hold the fuel sender upside down on a work bench and pull the fuel pump out of the lower mounting bracket. Once the pump is clear of the lower mounting bracket, tilt the pump outward and disconnect the pump from the sender assembly.
Replace any attaching hoses or rubber sound insulators that show signs of deterioration.
Install the rubber bumper and insulator on the fuel pump.
Hold the fuel sender upside down and install the fuel pump between the fuel pulse dampener and mounting bracket.
Attach the fuel pump electrical connector.
Install the retaining clamp on the fuel line.
Install a new fuel pump strainer on the outer edge of the ferrule until fully seated. The strainer must be facing the same direction as it was before removal.
Position a new O-ring on the top of the fuel tank and install the sender assembly.
Install the lockring using J-35731, or an equivalent spanner wrench.
Install the fuel tank as outlined later in this section.
Refill the gas tank.
Connect the negative battery cable.
Turn the ignition switch to the ON position to pressurize the fuel system and check for leaks.
There is no easy way You must drain the fuel tank and remove the tank to get to the fuel pump Disconnect the ground from the battery Remove the straps and the lines to the top Disconnect the electrical lines Drop the tank down Remove the locking retaining nut Pull out the sender with the pump Reverse to reinstall
Did you check the fuel pump relay switch? (behind R-headlight, from radiator, 3rd over [3.1 V6]) They have caused many unnecessary pump replacements.
As for the pump; You will need to drop the tank, but emptying it isn't required. First: Disconnect the battery.
There are 2 straps holding the tank to the vehicle, and once out you'll pull the sending unit at the top of the tank. * Remove the electrical connections before opening the fuel lines...redundant, I know...but safe.
Should the weight of a full tank be an issue, a cheap hand-pump from Autozone will connect to the primary fuel line in order to transfer the fuel to containers (or another vehicle).
The fuel tank must be drained, fuel lines and vent lines disconnected. Disconnect the filler tube that leads to the filler neck. Unplug the wire harness that leads to the top of the fuel tank.
Remove both straps holding the tank into position.
Remove the gas tank and the pump is located in the fuel sending unit that is accessed thru the top of the fuel tank.
You MIGHT not have to drop the tank. On the 95 LHS (same frame) you can go through the trunk. take the trunk lining out. Underneath it near the back seat there may be an access panel. If so it will make it MUCH easier to replace! Worth the time to check it out!