Fuel Odor or Signs of Fuel At High Pressure Pump To High Pressure Fuel Lines, Fuel Leak Found At the Bottom Of The Flywheel Housing – 2010-2015 Chevrolet & GMC

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Service Bulletin Bulletin No.: 19-NA-138
Date: June, 2019
TECHNICAL
Subject: Fuel Odor or Signs of Fuel At High Pressure Pump To High Pressure Fuel Lines, Fuel
Leak Found At the Bottom Of The Flywheel Housing
This bulletin replaces PIP4942B. Please discard PIP4942B.
Brand: Model:
Model Year: VIN:
Engine: Transmission:
from to from to
Chevrolet
Express 2010
2015 LGH, LML
Silverado 2011
GMC
Savana 2010
Sierra 2011
Involved Region or Country North America, Middle East, Israel, South America, Thailand and Africa
Condition
Some customers may comment on a fuel odor and/or a fuel leak found at the bottom of
the flywheel housing.
Some technicians may find fuel leaks at the high pressure pump to high pressure line
fitting connections, or at the high pressure line fitting to the fuel rail connection, on the
passenger side (right).
Cause
This condition may be caused by a fuel leak at the high pressure line at the right side
fuel rail.
⇒ There are two high pressure lines leading from the high pressure pump to
the right fuel rail. The lines are held in place with metal brackets and nylon
insulators. These brackets and insulators may cause a high pressure line
misalignment and induce fuel seepage.
Page 2 June, 2019 Bulletin No.: 19-NA-138
Correction
Complete the current SI diagnostic for any DTCs or symptoms found.
• If fuel leaks are found at the high pressure pump to fuel rail line fitting connections, Do
Not replace the high pressure pump. Leaks at the high pressure line fittings are
almost always caused by misaligned lines and/or low torque of the line nuts.
• If leaks are found at the high pressure line fittings, both lines should be replaced. The
routing of the fuel lines requires both lines to be loosened in order to replace either
one. It is therefore recommended to replace both fuel lines at the same time.
• If the pump is found leaking and this is an indication of pump fracture, refer to
16-NA-102.
While the high pressure fuel lines are removed, verify there are no leaks at the fuel feed
pipe to indirect (HCI) injector banjo bolt. Ensure the bolt is secure and properly torqued to
10 Nm (89 lb in).
Caution: Care must be taken not to scratch the high pressure line sealing surfaces when
fitting the lines to the pump or rail. A scratch in the sealing surfaces may result in a
fuel leak
Proper alignment and torque of the lines and fittings is critical. It is recommended to
secure the line fittings to the high pressure pump and rail with the plastic line isolators left
loose. Once the lines are properly aligned and the fittings are torqued, the isolator
fastener can be tightened.
Refer to Fuel High Pressure Pipe Replacement – Pump to Rail in SI.
Note: Follow all current SI repair procedures and torque specifications.
– For reference, the torque specification for the line fittings at the pump are
38 Nm (28 lb ft)
– For reference, the torque specification for the line fittings at the fuel rail are
38 Nm (28 lb ft)
Evaluate the fuel leak after the lines have been replaced.
• If the pump is leaking and there is no indication that the pump is fractured.
Parts Information
Part Number Description Qty
12633623
PIPE, FUEL HIGH
PRESS (LEFT SIDE
OF PUMP TO RAIL)
1
12634549
PIPE, FUEL HIGH
PRESS (RIGHT SIDE
OF PUMP TO RAIL)
1
Warranty Information
For vehicles repaired under warranty, use:
Labor Operation Description Labor Time
4022150 Fuel High Pressure Pipe Replacement – Pump
to Rail
Use Published Labor
Operation Time
Version 1
Modified Released June 21, 2019

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