Thanks. Something is staying hot and fryed the new battery and new fuel pump. The alt will freeze up while setting but loosens up when the truck starts. Could alt be causing it?

 

It's possible...... Does the fuel pump continue to run after you shut off the truck?

 

if the internal regulator is shorted it will drain a battery completely overnight
and can KILL IT but I have never seen a shorted alternator burn up a fuel pump


ALSO common sense says if the alt " freezes up while sitting " it needs replacing before moving forward with any other issues

 

You're right about that.. I'm gonna have the alt checked and I've already ordered an external fuel pump for it. I don't particularly care for the internal.

 

Gotta drop the tank anyway, as you don't want to be trying to pull fuel thru the dead one.

If you replace the in-tank pump with a good replacement, denso, or delphi pump, it'll last quite a while.

 

this!!!

 

It will drain the battery but not burn out a pump. The fuel pump is submersed in gasoline to keep it running cool. It should last 100K or more depending on the pump. You should make sure it's bad before you replace it with an external. Since the alternator is "freezing up" and there may be a bad diode in it(this can drain the the battery) think it's time for a new one!