Ford Repair Questions? Ask a Mechanic for Answers ASAP
That is fine Let me know how it goes and if you need any more info.
Ok I am looking for a better circuit description for this system but am finding very little. I have attached the diagnostic info for both dual tanks 7.5l systems. I beleive your is a hot fuel handling.
Do you have a test light or multi meter to test for voltage? If you do lets see what voltage you have at the oil pressure switch on the red/yellow wire. Also what voltage you have at the yellow wire on the inertia switch both into and out of the switch.
Do a fuel supply test when problem occures. These engine need a very good fuel supply or the condition you discribed will occure. I have attached the test description of the flow test.
The filters shouldn't be causing this problem unless they are clogged. I would love to help you get the wiring on this one straightened out but with ford having several different set ups on these and not being able to check the truck in person I don't knwo how else to tell you to check for the problem that is related to the fuel pump wiring problem.
As for the running problem it does sound like your having a intermittant low fuel problem. This could be caused by a bad pump or a restriction in the system somewhere.