Fuel gauge going crazy!!??
On my 87 305 tbi my fuel gauge like first thing in morning or after not driving for a little while will go up to being full then stop and shoot back down to about 1/4 of a tank. If the truck's hot it will just stay down to between empty and 1/4 tank but there is way more gas than that in it. I've checked the ground at the neck its good sanded down to bare metal and put it back on still the same. You think its the actual sending unit in the tank or fuel pump just trying to get a good guess before I throw parts at it. or gauge itself bad its been fine for about a year now and 15,000 miles of driving this is the first thing kinda messing up on it and input would be greatly appreciated.
Josh
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