Ford F150 Pickup. Instruction

Fig. 8: Identifying Fuel Pump Relay Harness Connector Terminals
Courtesy of FORD MOTOR CO.

Compressed Natural Gas Fuel Tank Evacuating

CAUTION: The natural gas fuel system is always pressurized to 95 psi (655 kPa)

downstream of the fuel pressure regulator and up to 3600 psi (24,821 kPa)
upstream of the fuel pressure regulator. Use care when servicing the fuel
system or personal injury can occur. The fuel system pressure must be
relieved before any component can be removed. The fuel tanks must be
evacuated prior to tank removal. Removal of components without
pressure relief or tank evacuation can cause natural gas to escape into the
air and cause injury or death.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Removal & Installation - F150 Pickup - CNG

Solenoid Functions Normally

1. Turn in the instruction lockdown valve jackscrew on the fuel tank solenoid valve(s). See Fig. 7 . Perform

COMPRESSED NATURAL GAS FUEL LINE VENTING . Disconnect the fuel fill line from the fuel
fill valve. See Fig. 9 . Connect the Fuel Venting Kit (164-R0911) and Adapter (134-00255) to the fuel fill
line. See Fig. 10 .

2. Connect the Grounding Cable (134-00121) to the fuel fill line connection. See Fig. 11 . Connect the

grounding cable to the ground rod. Connect the Fuel Filler Neck Venting Kit (134-00117) to the Venting
Hose Assembly (134-00118) and adapter. See Fig. 12 . Connect the fuel venting kit to the fuel filler neck
venting kit. See Fig. 13 . Connect the venting hose assembly to the vent stack. See Fig. 14 .

3. Remove the fuel pump relay from the power distribution box. Construct a jumper wire from 6" (152 mm)

of 18-gauge wire and 2 spade terminal ends. Jumper the fuel pump relay circuit between terminals No. 30
and 87. See Fig. 8 .

4. Slowly open the instruction lockdown valve jackscrew on the fuel tank solenoid valve of the fuel tank to be

vented. Observe the gauge pressure of the fuel filler neck venting kit. The pressure should be at tank
pressure if the fuel tank solenoid valve was identified as, "functions normally". Slowly open the bleed
valve on the venting kit and allow the contents of the fuel tank to vent to the atmosphere. Venting can
take in excess of one hour.

5. Close the bleed valve on the venting kit, and observe the gauge pressure. The pressure should be at or

near 0 psi (0 kPa). Repeat the procedure until all affected tanks are vented. Install the fuel fill line onto
the fuel fill valve.

NOTE:

It is recommended that venting be performed with a vent stack. Do not vent any
fuel tank unless a new fuel tank or a new fuel tank solenoid valve is installed.
Unnecessary venting of good tanks can cause damage to the fuel tank solenoid
valve.

NOTE:

On vehicles equipped with an extended range fuel tank, the jackscrew can
be reached through an access hole in the vapor retaining cover.

NOTE:

Solenoid diagnostics must be completed on all tank solenoid valves prior
to venting. All fuel tank solenoid valves must be in the locked down
position.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Removal & Installation - F150 Pickup - CNG

Ford F150 Pickup. Instruction - part 1327