F 350 2WD Pickup V8-460 7.5L VIN G EFI (1997)
Fuel Gauge Sender: Testing and Inspection
CAUTION: During in-vehicle tests, do not let tester terminal studs designated by arrows come in contact with vehicle ground. The gauge will be
shorted to the ground, preventing an accurate test and possibly damaging the gauge.
Fuel Tank Sending Unit
With the sending unit float arm in the empty stop position, resistance should be 15 ohms (below E). With the sending unit float arm in the full stop
position, resistance should be 160 ohms (above F). The fuel gauge should read empty at 22.5 ohms and full at 145 ohms.
Fuel Tank Second Sending Unit Test, Dual Tanks
On aft/axle (standard) fuel tank, the fuel sender electrical connector can be disconnected and attached to a second test sender outside the fuel tank. The
float can then be manually operated (up and down) while the fuel gauge operation is observed. Proper gauge function indicates a problem with the fuel
tank sending unit located in the fuel tank. Improper operation indicates a problem with the fuel tank gauge or wiring. Refer to Pinpoint Test A.
Fuel Tank Damage
If fuel indicating system components are functioning properly and inaccurate indications continue, check the fuel tank for distorted fuel tank sending
unit mounting angle or damaged fuel tank sending unit. Make sure the fuel delivery module (FDM) is the correct model for the vehicle and that the
FDM is not contacting the bottom of the fuel tank. Also inspect the vent hoses for kinks or obstructions.
