Question about 1990 Ford Bronco II
I changed fuel pump and changed relay still will not start has nio fuel pressure but it does have gas in the tank lol
When Ford Went to fuel injection on the 2.9 L V-6 they manufactured them with two fuel pumps.Pump number one is located in the fuel tank on a hanger complete with fuel gauge sending unit.This pump is used for volume.Fuel pump two is located on the drivers side almost directly under the drivers floor pan area nestled inside the frame.This pump is used for high pressure that is required for fuel injection.Your problem may lie in the pressure pump.Also the 2.9 L has a vacuum controlled pressure regulator that is located on the right hanf topside of the engine towards the backof the intake plenum on the fuel rail.It has two screws mounting it and is round with one single preformed vaccum line going to it.These have a filter screen that can become cloggedand be pushed into the regulator restricting fuel flow or the diaphragm just wears out.Check these three things out and ill bet you be running in no time.The bronco II`s also have two fuel filters one mounted on the drivers side mid vehicle nestle within the frame check it also.Well I hope this helps.
Posted on Jan 23, 2014
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Posted on Jan 02, 2017
remember the switch only gets power for 1 second when u turn the key on, the common problem is the ignition starter switch comes apart, it is located at top of the steering column near the bottom, drop the column down (2 nuts) and inspect the switch for separation.
Posted on Jul 27, 2009
check the pulse on the injector wire with a noid lite or a meter. If no flash then you most likely need a computer. Its called a quad driver in the PCM thats fried. You may have a shorted component that caused it to fail.
Since you say it will run if you add fuel manually I don't suspect the crank sensor because you have spark.
Posted on Aug 15, 2009
Testimonial: "Thanks much ill check in am"
A FORD EQUIPED WITH DUAL TANKS THIS YEAR MODEL HAS CHECK VALVES IN THE FUEL PUMPS .THE FUEL RUNS FROM THE REAR TANK WHEN IT IS POWERED ON TO A TEE AND INTO THE SAME LINE AS THE FRONT PUMP . THE PROBLEM IS AT THE BOTTOM OF THE FRONT FUEL PUMP THERE IS A CHECK VALVE ON THE FOOT AND IT IS NOT WORKING.WHILE THE TRUCK IS RUNNING WITH THE REAR FUEL PUMP ON IT IS PUMPING FUEL INTO THE FRONT TANK . IT WILL RUN OUT OF THE NECK WHEN IT IS FULL.THE FIX IS SIMPLE REPLACE THE FRONT FUEL PUMP. THEY DONT MAKE A CHECK VALVE REPLACEMENT I CHECKED I HAD THE SAME PROBLEM AS YOU.
Posted on Oct 13, 2009
Theres 2 pumps one in the tank, lift pump, and one in the chassis rail under the driver side. The one in the tank is cheap, the one in the rail is not. The one in the tank only produces low pressure to prime the main pump and if it is broken, may not cause that much of an issue except when starting. the one in the rail is a no-start if it fails. The idea is that the rail pump can supply high pressure for the injectors, so a fuel pressure test at the injector rail will determine which pump is playing up. Hope that helps Tim
Posted on May 26, 2010
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