2002 Ford explorer check gage light is on and fuel reads empty then sometimes shows actual reading. How do I fix that?.

SOURCE: ford f350 loss of power and poor fuel milage

I found the problem with my 2006 F350. It did not idle very smoothly, vibrated at 45 to 60 mph, and got poor milage. I brought it in and found the issue under warrantee. I had five of eight injectors bad. No wonder it was running bad.

SOURCE: When replaced the fuel send unit the fuel gage sits on empty

Try grounding the gauge wire at the tank. If the gauge and wiring are good the gauge will go way past full when you do this.

SOURCE: Gas gage on my 2004 Ford Explorer Sport Trac is not working

check your fuel pump wireing

SOURCE: 1987 ford f150 dual fuel tanks fuel qty gages

tank switch on dash could be bad, also selector valve could be bad. are the fuel gauges accurate front or rear. like you say the rear reads full, is it?? I would try the switch on the dash first.

SOURCE: Owner of 2004 Ford F250. Check engine light came

Check the fuel regulator at the end of the fuel rail. If if is not functioning properly it can cause the the problem that you are describing. Unfortunately other than doing an R&R with a known good regulator I do not know of a fool-proof test for this component.