Fuel - Pump Coupler Disconnected
89chevy06GMC NUMBER: 89-T-49
GROUP: 6C - Engine Fuel
DATE: April, 1989
CORPORATE
NUMBER: 936301
SUBJECT: INTANK FUEL PUMP COUPLER DISCONNECT
MODELS: ALL 1989 LIGHT DUTY TRUCKS WITH THROTTLE BODY FUEL INJECTION
Some 1989 trucks equipped with throttle body injection (TBI) engines (see list below) may experience a condition where fuel delivery to the engine is interrupted. This condition may be the result of the in tank fuel pump becoming uncoupled from the fuel tank sender assembly.
Engine Displacement VIN
and RPO Identification
2.5L TBI (LN8) E
2.8L TBI (LL2) R
4.3L TBI (LB4) Z
5.0L TBI (L03) H
5.7L TBI (L05) K
7.4L TBI (L19) N
Vehicles that are diagnosed as exhibiting this condition may be repaired by recoupling the pump to the sender, utilizing an additional clamp and washer in conjunction with existing parts and following service procedure below.
TYPICAL PUMP &SENDER VERTICAL INSTALLATION:
Service Procedure:
1. Following applicable shop manual procedures, remove fuel tank sender unit.
2. Loosen both coupler damps and remove coupler from sender (See illustration).
3. With a clean dry cloth, wipe off fuel pump outlet tube, sender pressure pipe and coupler hose I.D. (See illustration).
4. Position plastic clamps on coupler and install coupler on fuel pump outlet pipe.
NOTICE: DO NOT LUBRICATE COUPLER TO FACILITATE ASSEMBLY.
5. Slide clamp, P/N 25518880 and washer, P/N 3824159 on sender pressure pipe insuring orientation of clamp is as shown in illustration.
6. Bend rubber coupler slightly and install on sender pressure pipe.
7. Properly position both plastic clamps and tighten.
8. Slide washer and clamp down sender pressure pipe to a position against the rubber coupler.
9. With washer and clamp properly positioned and tight against coupler, tighten clamp.
NOTICE: INSURE CLAMP IS PROPERLY POSITIONED AS SHOWN IN ILLLUSTRATION TO ELIMINATE POSSIBLE WIRE CHAFING.
10. Utilizing new O-ring, P/N 3893116 install fuel tank sender unit into fuel tank.
11. Following applicable shop manual procedure, reinstall fuel tank.
12. Start vehicle, inspect for any fuel leaks and correct if required.
Parts are currently available from GMSPO.
For vehicles repaired under warranty, use:
Labor Operation Number: J5590
Refer to the 1989 Light Duty Labor Time Guide for the appropriate time allowance.