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How to troubleshoot code 87 on a 1990 Ford bronco 2nd.2.9

The pump runs when yo u turn on the key and it has 38lbs. Fuel pressure just trying to start it. It will start and run for about 2 or 3 seconds and then dies.

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What have you done? Try disconnect battery for 15 see what happened or you have to reset the computer.

Posted on May 10, 2017


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I have a 91 bronco w/ a 351w. the fuel pump wont stop running

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?

Nov 08, 2017 | 1991 Ford Bronco

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1989 Ford Bronco. When I hooked up my battery I can hear the high pressure fuel pump running even though the key is turned off. I can start the truck up and it will run for a while. I took it for a spin...

if the key is off and the fuel pump still running then the fuel shut off switch and or the fuel pump is bad and needs replaced. More than likely the fuel pump might need to be replaced. (my 86 5.0 did the samething)

Aug 12, 2010 | 1989 Ford Bronco

1 Answer

'88 Ford Bronco II, 2.9L Hp fuel pump won't activate 1st thing in the morn. Have new fuel pump, fuel pump relay,ignition switch. I turn key on & off a few times...then pump activates. everything runs...

sounds like it could be the relay. also this one has 2 pumps I think, one in the tank LP and one on the rail just under the driver. 2 relays also one for each.

Jul 02, 2009 | 1989 Ford Bronco II

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No Start

check this link it may just point you in the right direction.

Dec 13, 2008 | 1989 Ford Bronco II

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