gas gauge is temper mental

[the fall guy]

Hey guys....I was just wondering if you had the same problem with your gas gauge and how to fix it. When I fill my tank the gauge reads 3/4 tank...then 1/2 then3/4 again. It's all over the place. then when I first start it up it reads empty then after a while goes back up. I'm thinking it could be my gauge but could it be my sending unit (floats are out of whack) I know that if it reads full out than the sending unit is done but this one has got me confused thanks

 

[flatline]

I am having the same problem with my dual tank setup


my left (drivers side) jumps all over the place at times, sometimes it works right, sometimes it's 1/2 off when I know it's full.

my right ( pass. side ) doesn't even work 1% of the time, just pegs itself past full and stays there.

is it a ground wire or are both sending units messed up?

 

[poolcues]

IMO it's the ground wire.my old 78 jimmy was doing the same thing.replaced the gorund wire and it was fine after that.

 

[clarkjw24]

IMO it's the ground wire.my old 78 jimmy was doing the same thing.replaced the gorund wire and it was fine after that.

Yep the ground wire. If it reads full all the time its usually the sender. I just had to replace mine.

 

[tayven]

Hmm.

My gas tank when it is full reads a quarter of a tank and then goes down accordingly. So it will let me know when it is out, you think this could be the same thing? Once or twice it has just gone up like normal but then it always goes back down to a quarter. its weird. anybody have anything like this happen?