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What would be the most common reason for the fuel gauge to not work?
1999 Mercury Mountaineer

What would be the most common reason for the fuel gauge to not work?

(1999 Mercury Mountaineer)
Fuel Gauge reads full, however, the ECON display reads low fuel. Sending unit? Bad ground? Just the gauge?
2 answers & 2 comments
Popular Answer
on August 24, 2016
most likely the sending unit ,float arm/switch has gone bad.you can just replace that part for $138.99 or $161.99(pump NOT included)..there are two diff models..or replace the whole assembly(pump included)for $232.99..or just leave it like it is and use the trip button on odometer to keep up with your miles so you'll know when to re-fuel...this is if you do the work yourself. if a shop does it,price will be around $574.00--$959.00,depending on how hungry the shop is..there is a slight chance the gauge is broken,but will require a gauge sweep test to verify? i'm a betting it's the sender!
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on August 27, 2016
I was pretty certain myself that it was the sending unit. But, was looking for advice as they are a bit pricey. I've been using the trip meter to get by. However, I don't trust my wife to look at it and don't want her to end up along side the road if for some reason she drives this thing.
General Diagnosis
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on August 24, 2016
most likely the sending unit ,float arm/switch has gone bad.you can just replace that part for $138.99 or $161.99(pump NOT included)..there are two diff models..or replace the whole assembly(pump included)for $232.99..or just leave it like it is and use the trip button on odometer to keep up with your miles so you'll know when to re-fuel...this is if you do the work yourself. if a shop does it,price will be around $574.00--$959.00,depending on how hungry the shop is..there is a slight chance the gauge is broken,but will require a gauge sweep test to verify? i'm a betting it's the sender!
Sign in to reply
on August 27, 2016
I was pretty certain myself that it was the sending unit. But, was looking for advice as they are a bit pricey. I've been using the trip meter to get by. However, I don't trust my wife to look at it and don't want her to end up along side the road if for some reason she drives this thing.
on August 24, 2016
As you drive the vehicle , does the GAUGE respond appropriately for the time/miles driven , despite what the ECON display says?
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on August 27, 2016
The gauge doesn't move at all. Ever. Always reads full.

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