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2015 - 2017 Corvette: Service Bulletin: #15-NA-002: Information on Fuel Odor and/or Fuel Leaks from Underhood SIDI Pipes Between High Pressure Pump and Fuel Rails

#15-NA-002: Information on Fuel Odor and/or Fuel Leaks from Underhood SIDI Pipes Between High Pressure Pump and Fuel Rails - (Jul 11, 2017)

Subject Information On Fuel Odor and/or Fuel Leaks from Underhood SIDI Pipes Between High Pressure Pump and Fuel Rails

Brand:

Model:

Model Year:

VIN:

Engine:

Transmission:

from

to

from

to

Cadillac

CTS

2016

2017

 

LT4

All

Escalade

2015

2017

 

L83, L86,

All

Escalade ESV

2015

2017

 

L83, L86,

All

Chevrolet

Camaro

2016

2017

 

LT1, LT4

All

Silverado 1500

2014

2014

 

LV1, LV3, L83, L86

All

Corvette

2015

2017

 

LT1, LT4

All

Suburban 1500

2015

2017

 

L83, L86,

All

Tahoe

2015

2017

 

L83, L86,

All

GMC

Sierra 1500

2014

2014

 

LV1, LV3, L83, L86

All

Yukon

2015

2017

 

L83, L86,

All

Yukon XL

2015

2017

 

L83, L86,

All

 

Involved Region or Country

North America and N. A. Export Regions

Condition

Some customers may comment on one or more of the following conditions:

  • Fuel odor smelled
  • Fuel leak in front of vehicle
  • Low/poor fuel economy
  • Vehicle hard start or engine stumble
  • Vehicle no start
  • Wet foam insulator on engine

The technician may find fuel leaking around the bellhousing or VLOM.

Note: The conditions listed may occur with or without the Malfunction Indicator Lamp (MIL) illuminating.

Important: It is required to replace the engine fuel feed intermediate pipes during any service repairs that required one or more of the pipes to be loosened or removed.

Cause

This condition may be caused by the result of a fuel leak at one of the high pressure fuel rail pipe connections that was installed incorrectly during service of another engine component, that required the fuel system to be opened. (i.e. fuel rail, lifter, head gasket, High pressure pump, injector, etc.)

Correction

Important: If any damage occurred due to leaking fuel, be sure to replace as necessary. (i.e. Fuel Pump Insulator)


If you encounter a vehicle with the above concern, perform the following steps:

    1. Install Dye (p/n 88861206) into the fuel system via the filler neck
    2. Start Engine and let idle for 15 minutes
    3. Remove intake manifold
    4. Inspect for any leaks. 

Note:  **** Tightening the nuts is not an approved procedure *****

  1. If a leak is found at any nut location, change as denoted below.       
    • If a leak in pipe 2 is found, change only pipe 2 (Int pipe 2), ensuring the interfaces for this tube are clean and free of debris. 
    • If a leak in pipe 1 is found, change pipe 1 and pipe 2 (Int pipe 1 and 2), ensuring the interfaces for this tube are clean and free of debris. 
    • If a leak in pipe 3 is found, change pipe 3 only (Fuel feed). Ensure the interfaces for this tube are clean and free of debris. 
  2. After installing the new pipes, start the engine, let idle for 3 minutes and confirm no leak is evident. Performing a post-install leak check has proven to be beneficial so customers do not return with another leak.
  3. If required, replace the engine insulator if absorbed with fuel or emits a fuel odor.

If you cannot conclude if the leak is coming from one of the fuel feed pipes, start the engine and let idle for 5 minutes looking for source of leak. Refer to SI for further diagnostics.

Parts Information

Refer to the Electronic Parts Catalog (EPC) to determine the proper part numbers required for the Fuel Feed Pipe and the Fuel Feed Intermediate Pipes, if replacement is required.

Service Information

Refer to Fuel Feed Pipe Replacement in SI.

Refer to Fuel Feed Intermediate Pipe Replacement - Position 1 in SI.

Refer to Fuel Feed Intermediate Pipe Replacement - Position 2 in SI.

Version

2

Modified

July 11, 2017 - Updated the Models, Correction and Parts Information sections.

 

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