ALright, I've got a 99 Mystique, V6, ATX with the returnless fuel system. My car had a problem when it was under warranty and the fuel tank was dropped, cleaned and the fuel pump/housing replaced. The problem then was the same as it is now, when it gets below ~1/4 tank it hesitates. I had this problem at about 70k miles again so I pulled the fuel pump and cleaned it out good. Problem solved, at least for a little while... Another few thousand miles later, the problem returned, so I bought the FSVT pump and dropped it into my housing, after replacing the external filter and cleaning the sock that is on the bottom of the pump. Also, I removed the screen at the bottom of the pump housing.
The FSVT pump was installed at 84k, the car now has 94k and im having the same problem again, car gets below ~1/4 tank and it hesitates, fill it with gas, problem is gone... Has anyone else had this problem and had it return? Also, my out-of-tank filter was clogged up as well, but replacing that did nothing for me...
Im thinking that dirt is somehow getting into the tank, maybe by the filler tube or possibly by the part of the pump that you remove at the top of the tank, but that gasket was replaced a few times.
Does anyone have any ideas? Im getting sick of this problem returning.
My GF's dad who is a mechanic at a Lincoln/Mercury dealer thinks I have another pump going bad... What do you guys think?
All ideas are welcome!
EDIT: Oh yea, if no one has any thoughts, im gonna drop the gas tank and see what I can figure out...
