Tonwoo28

Does anyone recall the post about the gas guage doing to full and then back tho 3/4? It had something to do with the ground.

sb69coupe

When it swings past full it's due to an open circuit. Either the ground connection is loose, or there is a break in the wire between the sending unit and the gauge. Check the ground first, it's the easiest.

Shannon

Tonwoo28

Do you know where the ground is located?

SizzleChest

Is it bouncing back and forth or is it jumping all over the place?

Cookwithvette

Not sure about an 80 but on my 75 the ground point is just above the driver's side muffler on the frame.

tjl5709

How about this problem.

I fill up, it reads close to full.

After about 100 miles (tank about half full), it reads empty. :confused:

tyler77

tjl5709 my guage reads full when full and never fall below 3/4 on the guage. the ground has a good connection. good thing the trip meter works. does anyone have any ideas?

SizzleChest

faulty sending unit seems to be the easiest answer.