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Super Mechanic
Super Mechanic, Master technician
Category: Chevy
Satisfied Customers: 17158
Experience:  29 yrs. exp., ASE master, cert. in G.M. electrical, a/c, susspension, brakes, electronic steering
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97 CHEVY: DUAL FUEL TANKS AUX TANK ONLY FRONT TANK WORKS ANY

Resolved Question:

HAVE 97 CHEVY 3500 WITH DUAL FUEL TANKS AUX TANK ONLY FRONT TANK WORKS ANY IDEAS
Submitted: 7 years ago.
Category: Chevy
Expert:  Super Mechanic replied 7 years ago.

Hello and welcome to Just answer.com, Super mechanic here. About your vehicle.

 

There has been a service bulletin for that type of concern. Here is what it states.

 

 

 

Fuel Transfer Pump - Is Inoperative
Notes

File In Section: 06 - Engine/Propulsion System

Bulletin No.: 01-06-04-037B

Date: October, 2001

TECHNICAL

Subject:
Fuel Transfer Pump inoperative
(Replace Fuel Transfer Module)

 

Models:
1990-2001 Chevrolet and GMC 6-7H C-Series Conventional Medium Duty Models
With Gas Engine (VINs E, D, B, M, P - RPOs L18, LP4, L21, LRO, LSO)
1997-2001 Chevrolet and GMC 6-7F T-Series Medium Duty Tilt Cab Models
With Isuzu Diesel Engine (VIN 3 - RPO LG4) or Caterpillar(R) Diesel
Engine (VIN C - RPO LG5)
1996-2001 Chevrolet and GMC C/K 3500 (1 Ton) Models
With Gas Engine (VINs G, J, R - RPOs L18, L29, L31) or
Diesel Engine (VIN F - RPO L65)
and Dual Fuel Tanks

 

This bulletin is being revised to update part usage for C/K 3500 Models in the Parts information. Please discard Corporate Bulletin Number 01-06-04-037A (Section 06 - Engine/Propulsion System).

Condition

Some customers may comment on inoperative secondary fuel tank transfer pumps. In some instances, customers may experience multiple failures of the service replacement pumps.

Cause

This condition may be caused by the "Four Minute Final Pump Out" feature of the fuel level control module. This feature can command the transfer pump to on when there is no fuel in the secondary tank.

This command occurs with every ignition cycle for a period of four minutes. These transfer pumps can overheat and become inoperative when they are run dry.

Customers that never add fuel to the secondary tank can further compound this issue. In these cases, the secondary pump would become inoperative in a very short period of time.

Correction

Three new transfer pump modules have been released to correct this condition. The new module curtails the "Four Minute Final Pump Out" feature. When the sender in the secondary tank drops to a resistance reading of 2 ohms, the pump-out feature is disabled. At resistance readings greater than 2 ohms, the pump-out feature will continue to function. However, under this condition there should be enough fuel in the tank to prevent pump failure. Replace the fuel transfer module using the procedures and part numbers listed below.

C-Series Conventional Cab

 

graphic

 

Remove the component box lid.

 

 

graphic

2.Disconnect the fuel transfer module electrical connector (2).

 

 

 

 

graphic

 

3.Remove the fuel transfer module mounting nuts and the washers.

 

4.Remove the fuel transfer module.

 

5.Install the fuel transfer module, the washers, and the nuts.

 

6.Connect the fuel transfer module electrical connector.

 

7.Install the component box lid.

 

Tighten

Tighten the bolts to 30 N.m (22 lb ft).

T-Series Tilt Cab

 

1.Disconnect the fuel transfer module electrical connector.

 

2.Remove the fuel transfer module mounting bolts.

 

3.Remove the fuel transfer module (1).

 

4.Install the fuel transfer module and the bolts.

 

5.Connect the fuel transfer module electrical connector.

 

CK 3500

1.Disconnect the fuel transfer module electrical connector.

 

 

 

 

graphic

 

2.Remove the fuel transfer module mounting bolts (1).

 

3.Remove the fuel transfer module (2).

 

4.Install the fuel transfer module and the bolts.

 

5.Connect the fuel transfer module electrical connector.

 

 

 

graphic

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