HELLO I AM HAVING A PROBLEM WITH MY 1992 FORD EXPLORER.WHEN TRUCK SITS SOMETIMES I CAN NOT GET NO FUEL. I REPLACED FUEL PUMP ASSEMBLY AND FUEL PRESSURE REGULATOR. I STILL HAVE PROBLEM HOWEVER IF I TAKE RETURN LINE OFF AT REGULATOR AND TURN KEY OVER UNTIL FUEL COMES OUT THEN HOOK LINE BACK UP IT RUNS GOOD FOR A COUPLE OF DAYS THEN BACK TO SAME PROBLEM. WHEN I INSTALLED FUEL PUMP I HAD TO PRIME IT. CAN SOMEONE HELP ME PLEASE.

 

Welcome to FTE. Please turn off the caps, no need to yell here.
You might want to check to see if you are actually getting 12v to the pump when this occurs. You could have a weak relay or the ECM is delaying the pump output for some reason.
Jimmy