F 250 2WD Pickup V8-6.9L DSL (1985)
Fuel Gauge Sender: Testing and Inspection
DIAGNOSIS AND TESTING
WARNING: DO NOT REMOVE THE NIPPLE ON THE END OF THE FUEL RETURN LINE. IT IS THERE TO PREVENT FUEL
FROM DRAINING OUT OF THE TANK IN THE EVENT OF A ROLLOVER.
NOTE: On vehicles equipped with diesel engines and dual fuel tanks, refer to the diagnosis guide in this Section before proceeding with the
calibration testing.
CAUTION: DO NOT INTERCHANGE SENDING UNITS BETWEEN GASOLINE-AND DIESEL-POWERED VEHICLES. DOING SO MAY
CAUSE SEVERE ENGINE AND FUEL SYSTEM DAMAGE.
CALIBRATION TEST (USING ROTUNDA TESTER MODEL 021-00034)
Fuel Indicating System Test With Rotunda Tester Model 21-0015 Or Equivalent
The Rotunda Instrument Gauge System Tester Model 021-00034 or equivalent is used to diagnose problems in all fuel indicating systems using the
bimetal fuel indicator gauge and instrument voltage regulator (IVR).
Prior to performing fuel system test the following tester checks should be made.
1. Set tester switch at IVR CHECK position.
2. Attach tester ground wire to the negative (-) terminal of 12-volt battery and touch one of the tester terminals marked with an arrow to the
positive (+) battery terminal.
3. If the IVR check lamp does not come on, return tester for service or replacement.
TEST SET-UP
