Fuel sending unit

Hi everyone. I'm trying too test my sending unit in my tank since my gauge doesn't work. I tried grounding the plug and the gauge didn't move. Then I used my power probe and checked the plug and I had ground on one terminal and also read a ground at the other terminal with a slight power reading. So I supplied power to that terminal using the power probe and the gauge at the dash moves everytime. Does this mean the sending unit is bad since i'm showing ground and the wires seem tobe good to the dash since I can give it power and move the needle? Thanks everybody

 

could be a sunk float.

 

I'll check when i pull tank. Thanks.

 

If you jump the two prongs in the plug at the tank.....gas gauge should read full.

 

Thanks Craig. I'll have to try that. I think I did everything but jump them that way. I'll let you know what happens.

 

This is enormously helpful, my gauge will only read up to 7/8 full. I'll have to try it to see if it's in my sending unit!

 

Hey Craig, I ran a jumper from one side to the other on my plug going to my fuel sending unit and sure enough the fuel gauge moved up. Guess I need a sending unit. Thanks.

 

I'm with Tody, sunk float

when you pull the sender, ground it, then move the arm to see if the gauge moves.

 

I'll check that out also, thanks again.

 

All I did was re-seal the brass float where it fastens to the arm. Cheaper than replacing the entire assembly.

 

I drained the gas from my float and coated it with...Rust bullet...

 

I drained the gas from the brass float, blew it out with air, flushed it with brake cleaner, blew it out again and coated the float with this.
http://shop.advanceautoparts.com/p/seal-all-contact-adhesive-and-sealant-380112/7010007-P

 

Awesome info guys. Thanks alot.