I have a 1988 Chevy S10 pickup with a fuel sensor issue. The gauge will only go up to about 1/2 mark when full. With the sensor disconnected (open circuit) the gauge goes all the way to full, leading me to believe the gauge itself is OK. I replaced the sensor in the tank with a new one, but it did the same thing, only up to 1/2 mark with the float in the fully raised position. Sent the new sensor back and put the old one back in.
My question is - is there a resistor in the circuit somewhere (That maybe has shorted out) that would raise the resistance of the circuit, and make the needle go to full?
John