Gas Guage screwed up

[firelt90bronco]

I have a 1990 302. I replaced the gas tank, pump and sending unit, I put about 4 gallons of gas in it and moved it around my yard today. After about a minute the the gauge jumped around from near empty to a quarter, half and full tank. What the **** is wrong with it?

 

[mbtech2003]

check the plugg connection and make sure their is no corrosion in it. also make sure the float didn't stick while it was installed. >-

 

[firelt90bronco]

if the float stuck, wouldn't it read empty all the time?

 

[Bully Bob]

If it bumps up to "FULL" ....most likely a direct short...

This could be ******* the instmt. if it "pegs" it hard, .. to full. b-(

 

[Seabronc]

Yah, thinking about it, you may have a rub thru short on the positive side that is touching the frame someplace.

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