Fuel Gauge: Testing and Inspection

1. Place ignition switch in On position, then disconnect fuel gauge sending unit connector at top of tank and observe gauge. Needle should move to or remain at low end of scale.
2. Connect a jumper wire between sending unit ground cavity and gauge input cavity in body half of sending unit connector and observe gauge. Needle should move to high end of scale.
3. If needle performs as specified, replace fuel gauge sending unit; if not, proceed as follows:
a. Remove jumper wire and place ignition switch in Off position, then disconnect battery ground cable.
b. Check for continuity between sending unit ground cavity in body half of sending unit connector and ground. If continuity exists, continue with procedure; if not, repair ground circuit as necessary.
c. Remove instrument cluster and bezel, then disconnect printed circuit No. 1 connector 1 and probe connector cavity H for continuity to ground. If continuity exists, repair short as necessary; if not, continue with procedure.
d. Check for continuity between cavity H and gauge input cavity of sending unit body half connector. If continuity exists, replace fuel gauge; if not, repair open circuit as necessary.