New fuel press senser new fuel pump 3pumps 4 switches
SOURCE: 1990 ford F150 4 x 4 5L
Then the engine fuse may be blown it will be marked ECM I think, the fuel pump and injector circuits are two seperate systems, the fuel pump most likely has a stuck relay.
SOURCE: 2000 blazer 4.3 hard to start (fuel problem)
Do you have the fuel tester hooked the in the overgrown air valve on the fuel rail in the back of the engine? Or do you have the fuel line unhooked in the back and hooked to the pressure pump? You want the fuel pressure to be in that 60 lb range so if you are hooked into the pressure valve on the fuel rail allowing fuel to go through, then I am betting it is the fuel pressure regulator. To get to that, you have to take the throttle body off and take the plastic plenum that covers the injector packs. On the back of the mount where your six pack of injectors are sits the pressure regulator. If it is faulty then it is dumping fuel instead of holding the pressure like it should.
Get a Chilton or Clymer manual and it shows you in pretty good detail how to fix it. I've done it to my 98 S10 with the same engine.
If you unhooked the fuel line so you are losing pressure from the line back to the pump then I would say your pump is letting fuel back to the tank when it shuts off. My money is on the first possibility though.
Good luck
SOURCE: 1998 ford winstar 3 litre keeps stalling new fuel
WELL THIS VAN HAS MANY ISUSES NEED TO JECK FOR VACUME LEAK AT IN TAKE AND THE PLENUM IF ITS PLASTICK THEY TEN TO CRACK OR THEY HAVE GASKET FAILER VERY COMEN ON THIS CAR OR YOU MAY NEED TO CHECK EGR VALVE IF STUCK OPEN IT WONT IDLE THEN YOU HAVE THE IAC VALVE IDLE AIR CONTROL VALVE YOU CAN USE BRAKE CLEAN AROUND IN TAKE BUT BE VERY CARFULL FLAMIBAL SHOULD HAVE FIRE EXTINGSHER NEAR YOOU WHEN DOING THIS
Testimonial: "thanks turned out to be the air flow sencer on the breather so thanks to you i located and fixed the problem"
SOURCE: wont start. has spark, fuel to fuel rail, new TPS,
Check injector pulsation at injector harness with test light, with key on, disconnect harness at injector check for voltage, then reverse test light at battery and on the other pin check for ground pulsation while cranking engine, should have pulsation, if none bad computer, injector pulsation control by computer.
Jeep code 1129:
Possible Causes
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