it happen again....more question
 

ok so we installed new fuel pumps in our 92 f150 to fix the dual tank problem.
now when you turn the key to the on the fuel pump keeps running. dont know know if it will start cause we are waiting on other part.

what could cause this problem? i have read it could be either a relay or the pcm

this will happen on either tank. its a 92 f150 5.0, swear this thing going to be new bye the time we get done changing parts out for new ones