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Old 01-18-2010
webs820's Avatar
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I am: Nik !
Join Date: Apr 2006
Location: NY
Vehicle: 2004 Ford Ranger XLT 4.0L Supercab Stepside
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Gas Gauge and Check Engine Light problems

Looking for some input. its a 2004 4.0 4x4. I just hit 80,000 miles. driving today the gas gauge went from half tank to empty and the light came on. I thought it was a leak or something. as I pull into the gas station, the needle jumps back up to half tank. as I pull out it drops to empty again, then back to half tank. the truck sat for a few hours then i started it up and backed out of the driveway, the gas dropped to empty and the check engine light came back on. on my drive, the gas went back up but the check engine is still on....

any suggestions?????

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Old 01-18-2010
filmont's Avatar
I am: David Goodman
Join Date: Dec 2008
Location: Bellbrook, OH
Vehicle: 2009 Ford Ranger
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Sounds like the sending unit. Since I haven't had to deal with one in my truck, I will assume that it's in the tank. Can't tell you how to test it though.
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Old 01-18-2010
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I am: B P
Join Date: Dec 2009
Location: Los Angeles, California
Vehicle: 1991 Ranger -1998 Mazda b
Posts: 19
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It could be the anti-slosh module behind the the gauge cluster, or your float may have a tear. My 91 was doing similar things to the gauge after i had swapped out to a tach unit, I just changed the anti slosh unit from original and all is good.
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