Posted By: newportrider
Gas guage reading full all the time? - 02/11/10 11:59 AM
I have a 68 Polara I am working on. The gas guage is reading full. Where do I look for the problem? It ran out of gas in the garage last nite so I know the gauge is lying to me!!LOL
Posted By: FY1TA
Re: Gas guage reading full all the time? - 02/11/10 12:42 PM
Unplug the sender and see if it goes down . Sounds like its grounded somewhere .
Posted By: stumpy
Re: Gas guage reading full all the time? - 02/11/10 07:08 PM
Unless the arm on the replacemnet unit is a lot higher then the original,which it shouldn't be if you bought the correct sending unit, you have a shorted wire also.
Posted By: RapidRobert
Re: Gas guage reading full all the time? - 02/11/10 08:57 PM
What they said, key on, pull female connector off & if it goes back to E then plug it back in & if it goes back to/stays at F then run it out of gas as close as you dare and pull the sender & check it's ohms w the float "up" and "down". iirc the specs are 73? & 10 ohms but with it reading full constantly then it'll be apparent where it's grounded. W the sending unit electrical located halfway up on the side of the tank the whole thing gets submerged when the tank if filled and it's in effect a dead short to ground just like when you ground the female connector and that's why the gauge stays on F for along time when you first fill the tank until the level goes down far enough so it's actually below the windings then the gauge starts to show the correct reading.
Posted By: 70mopes
Re: Gas guage reading full all the time? - 02/12/10 07:57 PM
Check for 5 volts at the strip leading to the fuel gauge, It is possible that your voltage limiter is not working.
yes w key "on", unplug it at the tank & if it goes back to E either the sending unit inside the tank is shorted to ground or the wire from the female connector forward to the dash is grounded somewhere along that line under the carpet.