SB-10057257-3685
File in Section:

Service Bulletin

Bulletin No.:
Date:

06 - Engine
14-06-04-002B
January, 2015

TECHNICAL
Subject:

Information for No Start Due to Inoperative LPG Fuel Pump Resulting from Upfitter
Modifications

Models:

2012-2015 Chevrolet Express
2012-2015 GMC Savana
Equipped with Liquefied Petroleum Gas (LPG) – RPO KO7

This Bulletin has been revised to change connector callout X305 to connector callout X350.
Please discard Corporate Bulletin Number 14-06-04-002A.

Condition
Some customers may comment that their vehicle will not start. They may also comment that the condition is
intermittent.

Cause
An inoperative LPG fuel pump may be caused by an improperly connected G400 terminal. This condition may be the
result of one or more of the following:
The necessity of the upfitter removing and repositioning the G400 terminal from its original factory location to
another location on the chassis frame rail.
Specifically:
• The upfitter not properly preparing the chassis frame surface area selected for the new ground location for good
electrical contact.
• The upfitter not properly preparing the electrical contact area of the G400 terminal and not using a new
replacement fastener with a conductive finish to secure the terminal.
• The upfitter not properly finishing the area to provide corrosion control.
• Intermittent conditions and poor connections at connector X350 as a result of any of the preceding G400
terminal conditions.

Correction
Notice: When replacing an LPG fuel pump that has failed, the following MUST be performed to ensure the
integrity of G400 and connector X350:
Correction for G400
• For information on correctly performing an electrical ground repair, refer to the latest version of Corporate
Bulletin 10-08-45-001: Information for Electrical Ground Repair - Use New Replacement Fasteners with
Conductive Finish.
• For information on correctly performing the procedures for prepping and corrosion control, refer to the latest
version of PI0564: Wax Coating on Frame Peeling, Metal Shows Corrosion/Rusting.
• For information on selecting the proper products and coatings that GM believes to be reliable, refer to the latest
version of Corporate Bulletin 01-08-51-003: Application of Anti-Corrosion Materials.

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1. Review the original OEM location of G400 (4) in the graphic. The new G400 location selected by the upfitter will
be in this general area of the chassis frame.

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3679788

2. Review the graphics of the several new G400 locations that were possibly selected for use by the upfitter on the
chassis frame in order to become familiar with the various locations.
3. Using GM approved residue-free solvent or equivalent, remove any grease from the G400 terminal.
4. Disconnect and remove the G400 terminal from the chassis frame.
5. Carefully remove any corrosion from both sides of the G400 terminal.
6. Using GM approved residue-free solvent or equivalent, remove any grease from the area and allow to dry.
7. Carefully remove any factory coating from the area until clean bare metal is visible.
8. Prep the repair area, as outlined in the Recommendations/Instructions in the latest version of PI0564: Wax
Coating on Frame Peeling, Metal Shows Corrosion/Rusting.
9. Select a conductive fastener for the repair. Refer to the latest version of Bulletin 10-08-45-001: Information for
Electrical Ground Repair - Use New Replacement Fasteners with Conductive Finish.
10. Using a small brush, apply Dielectric Lubricant to both sides of the G400 terminal, install and secure as needed.
11. Perform the corrosion control procedure as outlined in the Recommendations/Instructions in the latest version of
PI0564.

Correction for Connector X350

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1. Disconnect the LPG fuel pump connector X350.

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2. The X350 connector is shown with the plastic insert in position and then removed. Inspect the X350 connector
for intermittent conditions and poor connections. Refer to Testing for Intermittent Conditions and Poor
Connections in SI.
⇒ If intermittent conditions and poor connections are found, repair as needed. Refer to Repairing Connector
Terminals, Connector Repairs and Wiring Repairs in SI.