My 89 had the same problem,the fuel sending units are from what I understand,basically a piece of crap,Hooked an Ohm meter up to it and found it was bad,so to my understanding you have to replace it with aftermarket or live with it,I pulled my tank and installed a fuel cell .problem solved. The Ford sending units suck and they go bad. Pulling the tank is no big deal,2 starps and the filler neck slides off,make sure the tank is near empty not a big job.good luck.
Jack
1989 LX
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Jack
1989 Mustang LX: Converted to Carb.650 AED Holley DP,Weiand Stealth Intake,Edelbrock Performer RPM Aluminum Heads,Hooker Super Comps, Ground Pounder Uppers and Lowers,Moroso Drag Springs,NEW COMP Xtreme Energy Cam and 1.6 RR. ,a few other goodies.*** New 1/4 times-12.50
1987 SC GT ( fast as hell)
2001 Powerstroke Tow Vehicle 1989 Coupe.
Sometimes when you cry,no one sees your tears..........
Sometimes when you are happy,no one sees your smile.........
But,FART just ONE time..........
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