Installation Procedure

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

WARNING:

Fuel/gasoline vapors are highly flammable. A fire could occur if an ignition source is present. Never drain or store gasoline or diesel fuel in an open container, due to the possibility of fire or explosion. Have a dry chemical (Class B) fire extinguisher nearby.

WARNING:

Wrap a shop towel around the fuel pressure connection in order to reduce the risk of fire and personal injury. The towel will absorb any fuel leakage that occurs during the connection of the fuel pressure gauge. Place the towel in an approved container when the connection of the fuel pressure gauge is complete.

CAUTION:

Clean all of the following areas before performing any disconnections in order to avoid possible contamination in the system:

The fuel pipe connections
The hose connections
The areas surrounding the connections

Relieve the fuel pressure. Refer to Fuel Pressure Relief .
Disconnect the quick connect coupling of the fuel feed hose from the fuel feed pipe of the fuel rail. Use a shop towel in order to catch any remaining fuel that may leak.
Install the J 42982 adapter between the fuel feed pipe of the fuel rail and of the fuel feed hose.
Courtesy of GENERAL MOTORS COMPANY

CAUTION:
Refer to Fastener Caution .

Install the J 34730-1A gauge to the J 42982 adapter, and tighten securely.
Turn ON the ignition in order to pressurize the fuel system.
Turn OFF the ignition.
Check for any fuel leaks.