If you are absolutely sure that the pump does not shut down after approx. 3-4 mins. then the only explanation for this is that the AAM is internally faulty.
Try and reset it in the following manner with the key out of the ign.:
1. connector, fuse and relays in place.
2. remove K19 relay and insert test wire into slot #86
. and verify that there is still a GROUND signal. If so............
3. remove the fuse box GROUND cable, then reattach (no need to put the nut on) and test the wire again.
4. do this a number of times to see if the GROUND signal is removed.
If the ground sig. is not removed, you have a faulty AAM.
If it does remove the ground sig. then it could be a one time problem or it could recur at a later time. You will have to keep an eye on it.