EXPERTEC Technical Service Bulletins (88-259-6E)

EXPERTEC TECHNICAL SERVICE BULLETINS

TECHNICAL SERVICE BULLETIN

INTANK ELECT. FUEL PUMP LOOSE REPAIR PROCEDURE/INSTALL P/N

Model(s): 1987-88 Chevrolet "P3" W/5.7L (VIN K) TBI Engine & 40 Gal Fuel Tank

Bulletin No.: 88-259-6E

Date: June 3, 1988

SERVICE INFORMATION

Some 1987-88 P-Trucks equipped with 5.7L (VIN K) TBI gasoline engines and 40 gallon fuel tanks may experience a condition where the intank electric fuel pump loosens from the sender. This condition may be caused by the fuel pump reservoir (plastic) on the bottom of the fuel tank coming loose and dislodging the fuel pump from the fuel tank sending unit.

REPAIR PROCEDURE

If this condition is encountered, it can be repaired using the following procedure:

1. Drain and remove the fuel tank per service manual procedures.
2. Remove fuel tank sender. The sender must also be inspected for damage. If the sender is damaged, it must be replaced.
3. Looking thru fuel tank sender opening, locate fuel tank reservoir (yellow plastic) on bottom of tank. Check attachment of reservoir to tank - reservoir is held to the bottom of tank by two welded studs and two attaching retainers. Reservoir must be tight against bottom of tank. Three different loose reservoir conditions may exist with the reservoir.
   1. The reservoir is loose on the welded studs, and the retainers have moved up the welded studs.
   2. One of the retainers has come off the stud and the reservoir has rotated around the other stud.
   3. Both of the retainers have come off the welded studs and the reservoir is moving around inside the fuel tank.

      To repair conditions A, B or C use the following steps:

      NOTE: When inspecting the retainers, all retainers that are damaged (cracked or broken) must be replaced. Reusing damagedretainers could cause a repeat incident.

      CONDITION A 

      Working thru the fuel tank sender opening, push the original retainers, if not damaged, down on the studs as far as possible. Using an extension, a socket swivel and a deep 7/16 socket, install one flange nut, P/N 274796, on each stud. Screw nuts down on studs and torque nuts to 1.8-2.2 N.m (16-20 in-lb).

      CONDITION B 

      Working thru the fuel tank sender opening, rotate reservoir back into position on both weld studs. Push the one remaining retainer, if not damaged, down as far as it will go. Install one washer P/N 331544 on stud with missing retainer. Install one flange nut P/N 274796 on each stud. Screw nuts down and torque nuts to 1.8-2.2 N.m (16-20 in-lb).

      CONDITION C 

      Working thru fuel tank sender opening, reinstall reservoir on weld studs. The fuel drainage opening in the reservoir must face the rear of the tank. Install one washer, P/N 331544, on each stud. Install one flange nut, P/N 274796 on each stud. Screw nuts down and torque nuts to 1.8-2.2 N.m (16-20 in-lb).

      Do not install any flange nuts without either an undamaged original retainer or a washer between the reservoir and the nuts as the nut could cut into the reservoir and cause a repeat failure. The flange nut and washer MUST NOT be substituted with uncoated parts. The parts listed are coated to prevent corrosion inside the fuel tank.

4. Reinstall the sender and fuel pump.
5. Reinstall the fuel tank.

WARRANTY INFORMATION

For repairs performed under warranty, use the labor operation listed below:

Labor Operation No.: L1288

Labor Time: 1.2 Hours

Add: 0.2 Hour - Repair Reservoir