20. Check Fuel Tank No. 1 Solenoid Valve Operation
Turn ignition off. Open instruction bleed valve on Fuel Filler Neck Venting Kit and vent system pressure to
zero psi (zero kPa). Close manual bleed valve on Fuel Filler Neck Venting Kit. Open fuel tank No. 1
solenoid valve manual lock-down jackscrew. Close fuel tank No. 2 solenoid valve manual lock-down
jackscrew to 62-79 INCH lbs. (7-9 N.m). Disconnect fuel tank No. 2 solenoid valve harness connector
C4121. Reconnect fuel tank No. 1 solenoid valve harness connector C4129. Turn ignition on. Using scan
tool, enter OUTPUT TEST MODE. Press "Start" button on scan tool. Observe system pressure on Fuel
Filler Neck Venting Kit Gauge. Press "Stop" button on scan tool. If pressure on gauge is zero psi (zero
kPa) when "Start" button is pressed, mark fuel tank No. 1 solenoid valve "Stuck Open". Replace any
upper tank rack assembly valve if marked "Stuck Open" and go to next step. If pressure on gauge is more
than zero psi (zero kPa) when "Start" button is pressed, mark fuel tank No. 1 solenoid valve "Good" and
go to next step.
21. Check Fuel Tank No. 3 Solenoid Valve For "Stuck Open" Condition
Turn ignition off. Open instruction lock-down jackscrew on fuel tank No. 3 solenoid valve. Ensure manual
lock-down jackscrew on fuel tank solenoid valve No. 4 is still closed from step 16) . Open manual bleed
valve on Fuel Filler Neck Venting Kit for 60 seconds, then close manual bleed valve. Observe system
pressure on Fuel Filler Neck Venting Kit Gauge. If pressure on gauge is zero psi (zero kPa), mark fuel
tank No. 3 solenoid valve "Good" and go to next step. If pressure on gauge is more than zero psi (zero
kPa), mark fuel tank No. 3 solenoid valve "Stuck Open". A NEW solenoid valve will be installed when
diagnostics are complete. Go to next step.
22. Check Fuel Tank No. 4 Solenoid For "Stuck Open" Condition
Ensure ignition is off. Close fuel tank No. 3 solenoid valve instruction lock-down jackscrew. Tighten
jackscrew to 62-79 INCH lbs. (7-9 N.m). Open manual bleed valve on Fuel Filler Neck Venting Kit and
vent system pressure to zero psi (zero kPa). Close manual bleed valve on Fuel Filler Neck Venting Kit.
Open manual lock-down jackscrew on fuel tank solenoid valve No. 4. Open manual bleed valve on Fuel
Filler Neck Venting Kit for 60 seconds, then close manual bleed valve. Observe and record system
pressure on Fuel Filler Neck Venting Kit Gauge. If pressure on gauge is zero psi (zero kPa), mark fuel
tank solenoid valve No. 4 "Good". If No. 3 solenoid valve is marked "Stuck Open", replace solenoid
valve at this time and go to next step. If pressure on gauge is more than zero psi (zero kPa), fuel tank
solenoid valve No. 4 is stuck open. Replace fuel tank solenoid valve No. 4 and go to next step.
23. Check Fuel Tank No. 5 Solenoid Valve
Ensure ignition is off. Install Electrical Harness for Venting Tanks to rear fuel tank rack harness
connector C421. See Fig. 5. Open instruction bleed valve on Fuel Filler Neck Venting Kit for 60 seconds,
then close manual bleed valve. Turn ignition on. Using scan tool, enter OUTPUT TEST MODE. Switch
NOTE:
This procedure will supply power to fuel tank solenoid valve for
approximately 30-60 seconds. If time expires, cycle "Start/Stop" button on
scan tool to restore power.
NOTE:
This procedure will supply power to fuel tank solenoid valve for
approximately 30-60 seconds. If time expires, cycle "Start/Stop" button on
scan tool to restore power.
2003 Ford Pickup F150
2003 ENGINE PERFORMANCE System & Component Testing - CNG