Ford F150 Pickup. Manual — part 1271

Fig. 31: Locating Fuel Pressure Regulator Coolant Hoses
Courtesy of FORD MOTOR CO.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Removal & Installation - F150 Pickup - Bi-Fuel - Gasoline/CNG

Fig. 32: Locating Fuel Pressure Regulator Retaining Bolts
Courtesy of FORD MOTOR CO.

FUEL RAILS & INJECTORS

Removal

1. Release CNG fuel pressure. See FUEL SYSTEM PRESSURE RELEASE . Release fuel system

pressure from gasoline system. See FUEL SYSTEM PRESSURE RELEASE under FUEL SYSTEMS
in under REMOVAL & INSTALLATION - BLACKWOOD, EXPEDITION, F150 PICKUP &
NAVIGATOR - GASOLINE article. Disconnect negative battery cable.

2. Disconnect the fuel tubes. Remove the air cleaner outlet pipe. Disconnect the accelerator cable.

Disconnect the speed control actuator cable. Remove the accelerator return spring. Remove the
accelerator cable bracket bolts and position the bracket and cables aside. See Fig. 33 .

3. Disconnect the evaporative emission canister purge valve hose. Remove the Idle Air Control (IAC) valve

fresh air tube. Disconnect the IAC electrical connector. Disconnect the Exhaust Gas Recirculation (EGR)
valve vacuum hose. Disconnect the Throttle Position (TP) sensor electrical connector and the EGR
vacuum regulator solenoid electrical and vacuum connectors. See Fig. 34 . Disconnect the fuel pressure
regulator electrical connector. See Fig. 35 .

4. Disconnect the Differential Pressure Feedback EGR (DPFE) system electrical connector. Remove the

NOTE:

See FUEL SYSTEM PRECAUTIONS .

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Removal & Installation - F150 Pickup - Bi-Fuel - Gasoline/CNG

bolt, disconnect the brake booster vacuum tube and position the bracket and tube aside. See Fig. 36 .
Remove the DPFE bracket nut. Position the crankcase ventilation tube aside. Disconnect the exhaust
manifold-to-EGR valve tube fitting. See Fig. 37 . Disconnect the 2 differential pressure feedback EGR
system hoses.

5. Remove the bolt and the DPFE system bracket. See Fig. 38 . Disconnect the main vacuum harness from

the throttle body adapter and position the harness aside. See Fig. 39 . Remove the 4 bolts and remove the
throttle body adapter. See Fig. 40 . Discard the throttle body adapter gasket. Disconnect and remove the
Positive Crankcase Ventilation (PCV) hose.

6. Position the power steering reservoir aside. See Fig. 41 . Disconnect the CNG fuel pressure sensor

electrical connector. Remove the CNG fuel regulator mounting bolts and remove the mounting plate. See
Fig. 42 . Disconnect the CNG fuel line from CNG fuel pressure regulator. Disconnect the body ground.
See Fig. 43 . The CNG fuel rail has non-magnetic spacer blocks behind the fuel rail. Make sure the spacer
blocks are retained. Remove the CNG fuel rail as an assembly. See Fig. 44 . Remove the fuel injectors.

Fig. 33: Locating Accelerator Cable Bracket Bolts
Courtesy of FORD MOTOR CO.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Removal & Installation - F150 Pickup - Bi-Fuel - Gasoline/CNG

Fig. 34: Locating EGR Vacuum Regulator & TP Sensor Electrical Connectors
Courtesy of FORD MOTOR CO.

2003 Ford Pickup F150

2003 ENGINE PERFORMANCE Removal & Installation - F150 Pickup - Bi-Fuel - Gasoline/CNG