The fuel level sensor may fail resulting in erratic reading of the fuel gauge. Sensor replacement is generally required to correct this concern.
Car Problem Reports
Isuzu Ascender Fuel Level Sensor May Fail
Isuzu Ascender Problem
Someone drove my car and ran it out of gas. Since then the fuel gauge wasn't accurate. However now it isn't working at all. A mechanic told me that the fuel pump would need to be replaced. Parts and labor around $500. Would this fix the problem?
Visitor, 2006 Isuzu Ascender
erratic fuel guage and engine light coming on at various times