Hi guys new to the site looks like lots of good info. here maybe you could assist with this problem.
1989 Ford F250 7.5 L 4X4 automatic
Last week I took a 50 mile drive in this truck and made a stop a few miles from home,came out of the store to find it would crank but would not start had it towed home and put a code reader on it to find a #96 code on the code reader (Fuel pump secondary circuit falt/high speed fuel pump relay open)so I replaced the fuel filter and fuel pump relay,started right up and ran fine,retested and the code dissapeared, took it for a 17 mile freeway test drive once again stopped near home to top off the fuel tank and while waiting at idle for an available pump engine stalled and would not start again.called the towing company once again,got home and checked for fuel pressure at the fuel rail and very close to nothing there,out of curiosity I tried to start it with starting fluid and it started right up and ran until starting fluid was removed also could hear the fuel pump running when the ignition was turned on.am looking for suggestions on what to look at next,the fuel pressure regulator is the only thing that comes to mind but don't know the symptoms of problems with that,your help is appriciated.

 

Your truck has a dual stage fuel system with a low pressure in-tank pump and a high pressure external pump and both have to work.

 

Thank you Paul,so having two tanks is that one internal pump each tank and one external pump or two pumps per fuel tank?

 

You have one low press pump in each tank and then a frame mounted selector valve, high pressure pump, and inline filter.

 

Okay did some testing this morning and both fuel pumps are functioning,any Ideas I might check out next ?