GM Service Manual Online
For 1990-2009 cars only
Makes
🢒
GMC_Truck
🢒
2003
🢒
Envoy - 2WD
🢒
Engine
🢒
Engine Controls - 4.8L, 5.3L, and 6.0L
🢒 Fuel Pressure Relief
Tools Required
J 34730-1A
Fuel Pressure Gauge
Disconnect the negative battery cable. Refer to
Battery Negative Cable Disconnection and Connection
in Engine Electrical.
Install the
J 34730-1A
. Refer to
Fuel Pressure Gage Installation and Removal
.
Loosen the fuel fill cap in order to relieve the fuel tank vapor pressure.
Open the valve on
J 34730-1A
in order to bleed the system pressure. The fuel connections are now safe for servicing.
Drain any fuel remaining in the gauge into an approved container.
Once the system pressure is completely relieved, remove the
J 34730-1A
.