Question about 1992 Ford Ranger

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1992 ford ranger

I have a 1992 ford ranger xlt 3.0 liter. when I turn the key to the on position the fuel pump engages but never shuts off. Every now and then it will engage and shut off momentarily ( pressurize cycle ) and the truck will start. when the fuel pump continues to run with no pause the truck will not start. injectors are getting signal fuel rail has fuel pressure, and it is getting a strong spark to all cylinders. this is a speratic problem with the vehicle. any help would be greatly appreciated.

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  • cbledsoe1 Oct 21, 2008

    I have the same problem. Any suggestions?

  • Anonymous Mar 20, 2014

    thought it was the fuel pump so we replaced it still starts and shuts off after 3 seconds

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If this speratic problem seams to happen most when it's raining or damp, it is a shorting master contol that is to blame. The master control mother board is located on the firewall. Over time, the moisture seal on the cover fails and the motherboard gets damp and meny false signals are sent. This can even happen if the truck is off and key is not in the ignition (this mother board will alwas have power going to it as long as the battery is connected). A cheap way to check this is to remove the cover, put a plastic grocery bag over the mother board and use an small elastic band to close the open end, allow the wires connected to the mother board to go out the open end. If this solves the problem, replace the seals on the master control cover. Care should be taken as if there is ANY corrossion on the mother board, it will need to be replaced.

Posted on Oct 28, 2008

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