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I need a wiring diagram for the fuel system for 1985 econoline 350 class c motor home i dont have power to fuel pumps dual if i jumper to relay i have power tommy here with the 1993 ford e 350 no pwer to the fuel pump question workin on an 06 ford e450 diesel a c wiring diagram 54 1 showe a dual pressur switch what is the purpose . Testing the ford fuel pump relay on the car is not that hard to do with the help of this how to tutorial ill show you how to do it using only a multimeter youll be able to find out if the fuel pump relay or the fuel pump inertia switch or the fuel pump is the cause of the no start condition on your ford car or pickup. 1986 ford f350 with 460 elec fuel pumps and holley carb has juice to fuel pumps in crank postion but no juice to fuel answered by a verified ford mechanic the two wires that should have power are the yellow wire and the red yellow wire here is a wiring diagram ask your own ford question fuel pump is stock aftermarket fuel pump from . 86 f350 please help discussion in ford trucks started by bostongarda jan 6 2005 page 1 of an evtm or wiring diagram would be helpful in explaining the setup better than what i wrote rolls up and strikes a target which opens the electrical contacts of the switch and shuts off the electric fuel pump on some vehicles a fuel reset