Chevrolet Repair: 1985 s10 pickup truck, s10 pickup, intermittent problem


Question
gas gage only reads 1/4 full when just filled up at gas station. then when i went to drive it again it read full. appears intermittent problem with gage. how to troubleshoot, think problem in sending unt but how check without dropping tank? thank you Bob

Answer
Hi Bob, There is no real way to test the sending unit unless you have a tool that you can connect to the wiring at the tank that has a resistor that you can change from 0 ohms to 90 ohms. 0 ohms would be empty and 45 haft and 90 full. This sounds to me like you have a bad level sensor inside the tank. I have replaced a lot of these on newer models.

         Mark