• Tiny
  • Roadbird383
  • 1990 Buick Lesabre

Engine Mechanical problem
1990 Buick Lesabre 6 cyl Two Wheel Drive Automatic 109000 miles

How to replace the fuel pump on a 1990 buick lesabre. Also, There are two pumps for this car.1.45" diameter and 2".

Wednesday, August 11th, 2010 AT 4:58 PM

1 Answer

  • Tiny
  • rasmataz
  • Member

Service and Repair

Fuel Pump/Fuel Gauge Sending Unit (typical)


Roller Vane Fuel Pump - Exploded View


Before servicing the fuel pump the fuel system pressure must be relieved, see MAINTENANCE PROCEDURES/FUEL SYSTEM PRESSURE RELIEF.
Disconnect the negative battery cable.
Raise the car on a hoist.
Remove the fuel tank, see FUEL TANK AND FUEL LEVEL SENDING UNIT .
Remove the fuel tank sending unit and pump assembly by turning the cam lock ring counterclockwise. Lift assembly from the fuel tank.
Pull the fuel pump up into the attaching hose while pulling outward away from the bottom support. Take care to prevent damage to the rubber insulator and strainer during removal. After the pump assembly is clear of the bottom support, pull the pump assembly out of the rubber connector for removal. NOTE: Inspect the fuel pump attaching hose for any signs of deterioration. Also check the rubber sound insulator at the bottom of the pump. Replace damaged or deteriorated parts.

Push the fuel pump assembly into the attaching hose.
Position the fuel tank sending unit and pump assembly into the fuel tank. Use a new "O" ring seal. NOTE: Care should be taken not to fold over or twist the strainer when installing the sending unit as this will restrict the flow of fuel. Also, verify that the strainer does not block the full travel of the float arm.
Install cam lock over the assembly and lock by turning clockwise.
Reinstall fuel tank.


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Wednesday, August 11th, 2010 AT 5:06 PM

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