is sender for gas tank bad?

[letsbarbq]

my gas gauge isnt working 100%. its always on 1/4. I grounded it and made sure the wire was connect to sender. I touch the ground to the sender and the gas gauge went straight to full. <br /><br />is the sender messed up in the tank? thanks for the help. i already fill it up too..so i know its not 1/4 full.

 

[petryshyn]

Re: is sender for gas tank bad?

Ground lead right at the sender (don't ground it for long and use a known good ground source). Does the gauge go to full?<br />If the gauge goes to full when grounding at sender, check the ground wire at the tank sender (sensor). Easiest way to do this is to supply a good ground to the tank sensor using a jumper lead right to battery neg. post. If the ground proves good, remove sender and measure resistance with ohmmeter from float empty to full position. It should vary in a linear fashion and not go open circuit.<br /><br />If this helps you fix it.....I take mine medium rare!!!<br />good luck!

 

[letsbarbq]

Re: is sender for gas tank bad?

schematic,<br />i knew it was somehting like that. i took off the wire that was connected to the sender. i thought it was a (+). when i put it directly to the red on the battery, the needle went straight down....... the opporsite way. i sat there for a sec and then said........oh, darn, it must be a (-) so i did that and the need went full force to full. i took out the sender and called it a night. the mosquitoes were killin me. so, i cover it up and then will check the ohm on it tomorrow and then hopefully get that tank gauge problem fixed. thanks for the help. i think you hit it on the head.