Gas Gauge Problem

[Mag]

I have a 1986 Chevy S-10 pickup 2.5 RWD. My gas gauge stopped working. I just replaced the gas tank and put in a new fuel pump w/ sending unit (Airtex E3637S). I thought the sending unit was bad. Still my gauge is not working. Fuse is good. All other gauges work. Can anyone please give me advice? Thanks!

[pontgta]

check for grounds.....There should be a purple wire(i think) hook that to ground right before the tank, and that should move the gauge. If not, its your gauge or wiring to gauge.

[Mag]

I double checked and it is grounded good at tank. I have been checking on replacing the gauge. I was told that the gauge is determined by the ohms from sending unit and they varied from 0 to 90 on some and 30 to 240, etc. on others. I have checked online to find out how many ohms Airtex E3637S sends out, but have found nothing. I called several auto parts stores and they cannot give me any info. Guess I will call Airtex company and ask them after the holiday.

Thank you very much for your help.

[motornut]

I'd check behind the cluster
all grounds go down to one about a foot from the cluster plug
check the board back there and the leads to it

[hatzie]

Originally Posted by Mag

I double checked and it is grounded good at tank. I have been checking on replacing the gauge. I was told that the gauge is determined by the ohms from sending unit and they varied from 0 to 90 on some and 30 to 240, etc. on others. I have checked online to find out how many ohms Airtex E3637S sends out, but have found nothing. I called several auto parts stores and they cannot give me any info. Guess I will call Airtex company and ask them after the holiday.

Thank you very much for your help.

GM light trucks used 90Ω fuel senders after 1966. The cars came along in about the same timeframe. The squares are well after that cutoff.

http://www.chevyclassicsclub.com/the...ry-1965-newer/