how hard is it to change a fuel pump on the 95 buick lesabre

after removing the fuel tank, it's pretty easy.

heres repair info may give you a idea how it goes hope this helps let me know :) GM Bonneville/Eighty Eight/LeSabre 1986-1999
Tank Assembly
DRAINING
REMOVAL & INSTALLATION
SENDING UNIT REPLACEMENT

CAUTION
NEVER apply battery power to a used fuel pump outside of the fuel tank.

DRAINING

CAUTION
Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

1.Disconnect the negative battery cable.

CAUTION
To reduce the risk of fire and personal injury, always keep a dry chemical (Class B) fire extinguisher near the work area.

2.Remove the fuel cap.
3.Raise and safely support the vehicle with jackstands.
4.Disconnect the filler vent hose from the tank.
5.Use a hand operated pump approved for gasoline to drain as much fuel as possible through the filler vent hose into a suitable container.

CAUTION
Never drain or store gasoline in an open container due to the possibility of fire or explosion!

6.Reconnect the filler vent hose and tighten the clamp.
7.Install any removed lines, hoses and cap. Connect the negative battery cable.

REMOVAL & INSTALLATION

CAUTION
Observe all applicable safety precautions when working around gasoline. Do not allow fuel spray or fuel vapors to come in contact with a spark or open flame. Keep a dry chemical (Class B) fire extinguisher near the work area. Never drain or store fuel in an open container due to the possibility of fire or explosion.

1.Use a suitable hand operated pump device to drain the fuel through the filler tube into an approved container.

1987-95 Vehicles

See Figures 1 and 2

1.Relieve the fuel system pressure.
2.Disconnect the negative battery cable.
3.Drain all fuel from the tank into a proper container.
4.Detach the sender assembly wires, tank filler and the vent hoses.
5.Disconnect the fuel pipe quick-connectors.
6.Have an assistant support the fuel tank, then disconnect the 2 tank retaining straps.
7.Lower the exhaust by disconnecting at the rear hanger, then carefully remove the fuel tank from the vehicle. Remove the tank from the vehicle slowly, to ensure all connections and hoses have been disconnected.
8.If installing a new tank, transfer the sending unit/pump to the new tank.

Fig. Fig. 1: Exploded view of the fuel tank removal and installation - early model shown, later years similar

Fig. Fig. 2: Installed position of the fuel tank and straps - 1995-96 vehicles

To install:

9.Install the fuel tank to the vehicle and install the 2 retaining straps.
10.Raise the exhaust and connect the rear hanger.
11.Connect the fuel pipe quick-connectors.
12.Attach the sender wires, the tank filler and vent hoses.
13.Carefully lower the vehicle.
14.Refill the tank with fuel and connect the negative battery cable.
15.Inspect for any fuel leakage.

1996-99 Vehicles

See Figures 3 and 4

1.Disconnect the negative battery cable.
2.Properly relieve the fuel system pressure, as outlined earlier in this section.
3.Raise and safely support the vehicle.

Before disconnecting any fuel lines from the fuel tank, thoroughly clean around all hose connections.

4.Disconnect the fuel tank filler pipe EVAP pipe from the fuel tank EVAP pipe.
5.Disconnect the fuel tank filler pipe from the fuel tank.
6.Detach the quick-connect fuel line fittings from the fuel tank.
7.Disconnect the two rear rubber exhaust hangers from the rear of the exhaust system and allow the exhaust system to hang down slightly.
8.If equipped, unfasten the exhaust shield mounting bolts, then remove the exhaust shield.
9.Support the fuel tank with a suitable jack or assistant.
10.Remove the two bolts securing the fuel tank straps, then swing the straps out of the way.

Do not bend the fuel tank straps, as this may damage the straps.

11.Lower the fuel tank enough to detach the fuel sender electrical connector and remove the fuel sender retaining clips.
12.Disconnect the EVAP pipe from the rear of the fuel tank.
13.Remove the tank from the vehicle slowly, to ensure all connections and hoses have been disconnected.

Fig. Fig. 3: Exploded view of the fuel tank mounting - 1996-99 vehicles

To install:

14.Clean all parts well. Inspect the tank for dents, rust or other damage. On high-mileage vehicles, it may be good practice to remove the fuel pump module and replace the flexible strainer on the fuel pump.
15.Position the fuel tank under the vehicle and raise the tank with the help of an assistant or a suitable jack.
16.Connect the EVAP pipe to the rear of the fuel tank.
17.Install the fuel sender retaining clips.
18.Attach the electrical connector to the fuel sender assembly.
19.Raise the tank into position into the vehicle and swing the mounting straps under the tank.
20.Install the front fuel tank strap mounting bolts and tighten to 35 ft. lbs. (47 Nm).
21.Remove the jack.
22.Attach the quick-connect fuel line fittings.
23.Connect the fuel tank filler pipe EVAP pipe to the fuel tank and tighten the hose clamp to 22 inch lbs. (2.5 Nm).
24.Connect the fuel tank filler pipe to the fuel tank and tighten the hose clamp to 22 inch lbs. (2.5 Nm).
25.If equipped, install the exhaust heat shield and the mounting bolts.
26.Position the exhaust system and install the rubber hangers.
27.Carefully lower the vehicle, then refill the fuel system
28.Connect the negative battery cable, then install the fuel filler cap, if not done already.
29.Turn the ignition switch ON for 2 seconds, OFF for 10 seconds, then ON and check for fuel leaks.

SENDING UNIT REPLACEMENT

See Figure 4

The fuel gauge sending unit is attached to the fuel pump on cars with an electric in-tank pump. The following procedure is for pump and sending unit removal and installation. Be extremely cautious of sparks or flame when working around the fuel pump. NEVER apply battery power to a used fuel pump out of the fuel tank.

1.Relieve the fuel system pressure, then disconnect the negative battery cable.
2.Raise and support the vehicle safely. Drain the fuel tank.

Before disconnecting any fuel lines from the fuel tank, thoroughly clean around all hose connections.

3.Remove the fuel tank from the vehicle, and place on a suitable workbench.
4.Remove the fuel gauge/pump retaining ring using a suitable spanner wrench to turn the assembly counterclockwise.
5.Remove the gauge unit and the pump.

Fig. Fig. 4: Typical fuel pump/level sender assembly - early model shown, later years similar

To install:

6.Install the gauge unit and the pump.
7.Install the fuel gauge/pump retaining ring using a suitable spanner to turn the assembly clockwise to lock the retaining ring.
8.Install the fuel tank in the vehicle, as outlined in this section.
9.Carefully lower the vehicle.
10.Fill the fuel tank.
11.Turn the ignition switch to the ON position for 2 seconds, then turn to the OFF position for 10 seconds. Turn the ignition switch back to the ON position and check for fuel leaks.