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5.0L (1979-1995) MustangTechnical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.
It's a broken baffle in the tank. I had the same problem. There's a little rectangular box in the tank that sometimes breaks lose and causes problems. Just replace.
If it is broken when I bring down the tank I would be able to here something by rocking the tank if theres anything loose? I will look into it when I replace my pump...
Thats what I will do, As soon as I swap my intake I will throw in a 180. But for now I will set my fan at around 185. With a heat gun to measure the temp, where should I read the correct temp to set my fan to turn on? At the filler neck going into the lower intake or at the radiator right after the water inlet?