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Possible the first pump put trash into the system and the second one either bought the farm from restriction,junk in the tank, or just plain old didnt replace it correctly. if its sucking air, cavatating the pump it will kill it quick.
We had an astro van v6 it ate about 4 in 125k miles. Never did really figure it out and the wife lost confidence in it so we cash for clunkered it.
I generally dont run any vehicle with a in tank pump lower than 1/4 tank since the fuel helps cool the pump.
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