Yep, it's a separate system. I recently had a whining noise coming from
the pump a few days after having Ford do a bed plate seal oil leak
repair job. I took the truck back to Ford for the whine, and the
mechanic said that it was due to air cavitation in the system that had
formed in the pump. Supposedly there was air working it's way through
the system after the engine had been pulled and flipped and all from
earlier bed plate seal work. Anyway, the mechanic took the truck back
and said he bled out the air and topped off the coolant and the whine
The whine stayed gone for about three weeks. It came back yesterday.
I took the truck back to Ford and questioned the mechanic more about
the system, and that's when he told me it's completely separate from
the engine cooling system. Also, he said that the fuel coolant reservoir
was low again and there was air in the pump. He said that now he thinks
that the system is loosing coolant from somewhere and sucking air in.
Also, he said the pump was loose and he went ahead and ordered a
new pump to be installed when it gets in stock.
I didn't get a chance to ask him any more questions, but I wish I
could have asked him exactly what he meant by "the pump is loose".
Also, where is the pump exactly? Is it down in front at the bottom
by the radiator? Because that is where it sounds like the whine is coming
from. Would this pump be removed and reinstalled during the bed plate
oil seal leak repair work? Finally, I had to drive the truck for about 100
miles with it whining. Does this mean hot fuel was being sent back to my