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I have a 04 taurus that has had an erratic fuel gauge for almost as long as I've owned the car which is 6 years. The check engine light has been on for almost 3 years and it always said high input circuit fuel level sensor. took the car to the ford dealer many times and they said my fuel pump needed to be replaced and quoted me $500 or more. I finally found the fix because my car is a flex fuel. It was the flex fuel sender module.

Part number- YF1Z-14A069-AA WIRING ASY

I picked it up from ford for 47 (thanks to my dads discount) retails for about 68 dollars now.

I had trouble removing the radio so I looked behind it and it was on the drivers side near the bottom. I have the floor console so it was a pain in the butt. Very easy from that point though. I used a 5/16" wrachet because there is one little bolt that holds it in. As soon as I got everything tightened up and put the battery cable back on I started the car and no check engine light and i found out i had a half a tank of gas. I had been going off of my trip meter for years and by my calculations i would have been filling up in a few miles. so nice to have it working now!

I had a lot of trouble finding that this was the problem, wanted to make a post to help others who maybe haven't tried this and especially before you change the fuel pump and find out it doesn't help!
 

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I wish you would have found this site earlier! The ffv fuel gauge module issue has been discussed for years. Would have saved you a lot of grief. Anyhoo, glad you got it fixed!
 

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Great advice. Thanks

Thanks for the tip on the Flex Fuel Module, I replaced it and now the fuel guage seems to be working properly. Nice to know how much gas I have.
I have a 2000 Taurus and I was able to access the module from under the driver's side dash but had to remove the lower panel under steering wheel (easy, remove 2 screws) to create more room to work.
Hopefully more people learn of this simple, do-it-yourself fix because the part cost $60 at local dealer and if you have have a repair shop do the work it could end up costing up to $150, depending on who you go to.
Bottom line is this module seems to be the simple fix for a common problem with this vehicle.
Also found these pics to be helpful:
Gen 3 & 4 Erratic Fuel Gauge (Flex Fuel only) - Taurus Car Club Maintenance and Modification Wiki
 

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How about erratic gauges for those of us with older engines (I have a '99 Sable LS with the 24 valve Duratec)? I find it hard to believe that after maybe 100 miles of driving I've gone through half a tank. My other Fords, an '01 ZX2 and an '09 Flex, are inaccurate and accurate, respectively.
 

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How about erratic gauges for those of us with older engines (I have a '99 Sable LS with the 24 valve Duratec)? I find it hard to believe that after maybe 100 miles of driving I've gone through half a tank. My other Fords, an '01 ZX2 and an '09 Flex, are inaccurate and accurate, respectively.
My '98 does that as well. it is annoying, but I've learned to live with it. I'm kinda used to it, but I would love for a fix (if there is one). I've tried a few of the chips that plug into the cluster, but no dice.
 
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