[hot_rod_kid]

So, finally getting around to fixing the faulty fuel gauge issue in my 64 Belair, 230 inline. The gauge sits just under full mark, and whenever I've driven it, bounces around between 3/4 full and just under full.

Now, I've searched the interwebz and havent really found much to help me out. I ran a jumper wire from the post on the sending unit to the post on the gauge, same problem. That rules out bad sending wire. I disconnected the ground from the tank, hooked it up to the (-) on a battery charger to ensure I got a good ground, same problem.

My last resort is to buy a new sending unit or gauge. Which do you folks recommend?

Also, the ground post on the tank is very very bady corroded. I didn't bother trying to remove it because I was afraid of it breaking off. Should I try that before buying anything?

Thanks in advance

[sparkchaser]

Fix the ground post on the tank or find some other way to ground the tank. That may be your problem.

[richard stewart 3rd]

Hi Kid
It could be a ground problem, but I think it's the sending unit in the tank. You should check the ground first thing. I'd just put a new ground wire on. That wire you took of & checked is a signal wire, (ohms) it runs right to the gauge. To check the sending unit you'll need a multi-meter (set it on 200). You should have an idea of how much gas is in the tank. Take that wire off the post on the sending unit & attach the m-meter to the post, then ground the other wire from the meter, what's the reading? 0. to 90.0 ohms with 0. zero being an empty tank. Is your reading compatible with the amount of fuel that's in the tank? If you have an ohms reading turn the key to the on position, then remove the ohms wire from the SU, the gauge should peg to about 3oclock. If it pegged, take that same wire & touch it to ground, the gauge should go to empty. If the gauge did what it was supposed to do, then the problem is either the ground or the sending unit, if you have already replaced the ground wire (like you should have), then the sending unit is the culprit.
Rich

[hot_rod_kid]

Thanks Richard. I'll give that a shot.