Well, i just replaced my fuel pump (and pulsator and strainer while i was in there) and now i noticed the fuel gauge is all over the place. It seems to change instantly instead of having a delay from the effects of fuel sloshing. When braking or accelerating it will vary sometimes even more than 1/4 of a tank! And will even chang a good 1/8 on slight up and down hills.

What the heck could have happened? Could this be the sending unit or maybe the gauge itself? Seems odd that it is right after a pump change though, but i did nothing to it other than the arm went up an down a few times in the process.

THis is very annoying though as i now only know how much gas i have to a 1/4 tank approximation

Any one else experience this?

thanks.

My '84 z28 does the exact same thing. When i brake it will change up to a 1/4 of a tank or more and sometimes it will just move for no apparent reason.

ive got the same thing in my camaro, everyone has told me to replace the sending unit and wiring but i dont want to drop my tank again for 1 thing cuz im pretty much a "dont mess with the tank unless your already down there" kind of guy

same thing in my 89
you described it to a ttt

It's pretty much normal. I've seen mine go from 3/4 a tank to 1/4 a tank in the process of cruising, braking, then accelerating from a stop.

Try grounding the tank.

well, the sending unit is grouded through the black wire on the harness.

Now what i had done though......i noticed where the black wire attaches to the top of the sending unit it was a good bit rusty. SO i cut the wire off the clip and crimped a new clip on and had it tack welded to the sending unit. I then applied a bunch of permatex dieclectric grease to the exposed part to prevent future corrosion.

I did have a case on our mazda where a connection was corroded so i cleaned it up and used that "sil glyde" goop for spark plug wires thinking it was dielectric grease. It then set a code. I cleaned all the goop out and all was good I don't understand how the heck that was possible but ??????? I can't imagine that would be the case here though, it's dielectric grease for crying out loud. What do you guys think, you guys ever use that before?