Auto Repair 2003 Ford Expedition Natural Gas Fuel Delivery System
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NOTE : After each service or repair procedure has been completed , reconnect all components . Clear DTCs and repeat QUICK TEST procedures to ensure all EEC system - V works well and the DTC is no longer present . Diagnostic Aids Perform this test when directed by QUICK TEST or if directed by other test procedures . This test is used to diagnose : Fuel Pressure Fuel Supply Line Fuel Filter Fuel Injector ( s ) Fuel Pressure Regulator Fuel Injection Supply Manifold ( Fuel Rail ) Rail Fuel Switch Solenoid Valve ( s ) NOTE : Fuel rail solenoid valve cover is also referred to as the low pressure valve solenoid cover . The fuel tank solenoid valve cover is also referred to as the fuel tank solenoid valve.WARNING : Always refer to the safety procedures to reduce the likelihood of injury . See FUEL SYSTEM SAFETY PRECAUTIONS . 1 ) Check System Integrity round ignition switch to the ON position for 5 seconds . Turn the ignition switch to the OFF position .
Check the fuel system leaks , broken or kinked hose . See Fig . 237 or Fig. 238 . Check the wiring harness for damage or loose connectors . Make sure the vehicle has to follow the maintenance schedule . Make sure the following conditions are met : Fuel Filter Element Is Okay Inertia Fuel Switch ( IFS ) Is Set Battery Is Fully Charged Fuel System Repair Fuse Is Okay concerns as needed . If the vehicle exhibits poor fuel economy , do the procedure FUEL SYSTEM PRESSURE RELEASE SYSTEM FUEL down in the REMOVAL proper ventilation & INSTALLATION article . For symptoms of fuel odor , go to step 16 ) . For all other symptoms , go to the next step . 2 ) Check the Fuel Tank Pressure rounds ignition switch to the OFF position . Install Ventilation Equipment and Filler Neck Fuel Gauge Fuel Pressure Delivery System of Special Tool Kit ( 134-00114 ) connector to vehicle refueling . Open the by-pass valve , which is located in the fill valve . See FUEL TANK ventilation procedures under compressed NATURAL GAS SYSTEM FUEL PRESSURE FUEL SYSTEM RELEASE bottom vents in the right REMOVAL & INSTALLATION article . Turn the ignition switch to the ON position . Record fuel tank pressure . If the fuel pressure reading of more than 500 psi ( 3448 kPa ) , turn the ignition switch to the OFF position . Close by-pass valve . Remove the fuel tank venting tool and go to step 7 ) ( no starts ) or go to step 5 ) . If the fuel pressure is 500 psi ( 3448 kPa ) or less , turn the ignition switch to the OFF position . Check the fuel level . Adding fuel to the tank if necessary . If the fuel level is okay , check for power at the solenoid tank valve . Go to the next step .
NOTE : After each service or repair procedure has been completed , reconnect all components . Clear DTCs and repeat QUICK TEST procedures to ensure all EEC system - V works well and the DTC is no longer present . Diagnostic Aids Perform this test when directed by QUICK TEST or if directed by other test procedures . This test is used to diagnose : Fuel Pressure Fuel Supply Line Fuel Filter Fuel Injector ( s ) Fuel Pressure Regulator Fuel Injection Supply Manifold ( Fuel Rail ) Rail Fuel Switch Solenoid Valve ( s ) NOTE : Fuel rail solenoid valve cover is also referred to as the low pressure valve solenoid cover . The fuel tank solenoid valve cover is also referred to as the fuel tank solenoid valve.WARNING : Always refer to the safety procedures to reduce the likelihood of injury . See FUEL SYSTEM SAFETY PRECAUTIONS . 1 ) Check System Integrity round ignition switch to the ON position for 5 seconds . Turn the ignition switch to the OFF position .
Check the fuel system leaks , broken or kinked hose . See Fig . 237 or Fig. 238 . Check the wiring harness for damage or loose connectors . Make sure the vehicle has to follow the maintenance schedule . Make sure the following conditions are met : Fuel Filter Element Is Okay Inertia Fuel Switch ( IFS ) Is Set Battery Is Fully Charged Fuel System Repair Fuse Is Okay concerns as needed . If the vehicle exhibits poor fuel economy , do the procedure FUEL SYSTEM PRESSURE RELEASE SYSTEM FUEL down in the REMOVAL proper ventilation & INSTALLATION article . For symptoms of fuel odor , go to step 16 ) . For all other symptoms , go to the next step . 2 ) Check the Fuel Tank Pressure rounds ignition switch to the OFF position . Install Ventilation Equipment and Filler Neck Fuel Gauge Fuel Pressure Delivery System of Special Tool Kit ( 134-00114 ) connector to vehicle refueling . Open the by-pass valve , which is located in the fill valve . See FUEL TANK ventilation procedures under compressed NATURAL GAS SYSTEM FUEL PRESSURE FUEL SYSTEM RELEASE bottom vents in the right REMOVAL & INSTALLATION article . Turn the ignition switch to the ON position . Record fuel tank pressure . If the fuel pressure reading of more than 500 psi ( 3448 kPa ) , turn the ignition switch to the OFF position . Close by-pass valve . Remove the fuel tank venting tool and go to step 7 ) ( no starts ) or go to step 5 ) . If the fuel pressure is 500 psi ( 3448 kPa ) or less , turn the ignition switch to the OFF position . Check the fuel level . Adding fuel to the tank if necessary . If the fuel level is okay , check for power at the solenoid tank valve . Go to the next step .
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