So I am trying to figure out if my tank is really 17gallons. Filling up the tank from just above empty I usually get around 13gallons in. After filling, the needle moves off of full in less than 20 miles. When it gets low, less than 1/4 of tank the guage fluctuates with accel/decel as well as turns, to a point where it sets of the low level annunciator.

I would suspect the guage....but twice now while decelerating, for a cloverleaf exit, the car stalled and I had to pull over and restart. Mind you being its a GTP ,I try and take the exit at 40-50mph when I should be at 30-40!! I have replaced the fuel pump so is it possible its not seated right???

I just have a hard time believing that with 4-5 gallons that should still be in the tank that it would fluctuate that much.

tank is really 18 gallons but only 17 of it can ever be used to the angle GM installed it at

sounds like the internal baffles broke and is not keeping the fuel bay the pump

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

That would be a problem, an unfix able one at that.

fixible but you need a new tank lol

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater