Fuel gauge only reads about half of the tank? - Chevy Impala Forums
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post #1 of (permalink) Old 07-18-2019 Thread Starter
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Fuel gauge only reads about half of the tank?

I have a 2002 impala base model and I noticed when I went to fill my car up from fully on E it only took $20 to get to full, which is about 6.5 gal in my state.

From every site for specs on the car it says it has a 17 gal tank, and i know that when it hits E it has about 2 gal left so that's about 8.5 gal in total after filling it, so where is the other 8.5 gal it's supposed to have?

I don't have any issues with running out of gas quickly as I don't drive the car everyday, but I am confused about what is going on, does my car have a secondary reserve tank that's plugged or something? If so how would that even happen?
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post #2 of (permalink) Old 07-21-2019
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If you fill up at station, the gas pump clicks off automatically when full, and gauge reads "F".... and..... you know you got 2 Gallons after gaige reads "E". It appears the gauge is working fine. If so... I got two possibilities. 1) Your 17 gallon oem tank has something else in it. Like marbles or little rocks. Bitter ex? College prank? 2) its not an oem 17 gallon tank.

Number #2 - should be easy to verify by looking underneath for anything that doesn;t look 17 years old. the oem tank is black abs, its thick and rugged as can be. i think those tanks will last 100 years minimum. I can;t see anybody replacing it unless it was puctured or damaged in a previous wreck. 2 minutes to determine this.

If its Number #1 - you need to look in tank. figure an hour. run it dry, expect a little spillage from what gas may stay in gauge sender unit assembly thingy. do it outside and open all doors and trunk, because it will get very fumey from gass left in tank. Access panel to that is located in the front center of trunk floor. Fold down back seat to get at it easy. Eight little screws gets that off, Then you see fuel gauge assembly. Disconnect eveything.. spin off big lock ring, pull out gauge. its like a can of coffee big. its not a straught shot out, its gonna spill a bit, and then have a look inside of tank.

it reads like you can only squeeze 8.5 gallons into it from bone dry to click-off full at the gas pump - no matter what. It was a 17 gallon tank when it came off the line. 2 gallons remaining when it is at "E" sounds about right. That is what reallly counts.... knowing exactly what you have left when it gets low. But it would be nice not to have fill up as often. #1 is highly unlikely, but what else is left after you see a good gauge and oem 17 gallon tank? use extreme caution if your curiosity drives you to going in. Good luck.
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