I turn the ignition switch on and the fuel pump comes up to pressure then stops and the truck will start but most of the time now the fuel pump will not stop running and the truck wont start. What is the problem? On the injector line if I push in on the valve stem there seams to be plenty of fuel pressure as it shoots up 14+ inches.
Does the pump stop running when you turn off the key? With electric fuel pump, the fuel pump relay sends voltage to the pump. The control side of fuel pump relay needs voltage and ground.
Engine cranking do you have spark at the plugs and fuel injector pulse? Use a gage and check proper fuel pressure, my info says 35--45 psi. Usually, if pressure is too high you check for a problem on the return side. If pressure is too low, you check the supply side of the fuel system.
Usually with initial prime the computer grounds the control side of fuel pump relay, for a couple of seconds, then w/o rpm signal, it shuts off. Maybe the ground wire is shorted to ground or problem with computer?
SOURCE: 1994 4.0 ranger truck idles
try changing the fuel filter first. If that doesn't help, get back to me.
SOURCE: 1987 ford bronco engine wont start
I had the same issue on my '86 Bronco. Change the ECM(computer) and your problem will go away.
SOURCE: i have a 1994 ford bronco with a 5.8 351w. when
Take your Bronco to an Autozone or Oreillys for a free scan. Offhand a new ignition switch would seem like a good idea, because the fuelpump should not be working in the ACC position.
If a new ignition switch does not help the fuelpump problem the pump is wired to an accessory. You need to look up the fuse info in an owners manual.
SOURCE: replaced fuel pump,and filter. checked all
Hey Bob, Did u ever find a solution to ur problem? Having the same issue with my 2000 f 150..
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