Question about 1990 Ford F150

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1990 f250 fuel system

I replaced fuel tanks and sending units,both fuel gauges work and both pumps run when key is on,I reset the inertia switch,but truck still will not start.What did I do wrong?Truck started fine before

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  • jdford Oct 29, 2008

    the fuel pumps run when the respective swith is on front or rear and you turn the key on.I do have spark at the ignition

  • jdford Oct 29, 2008

    the fuel filter was replaced two days before I changed the fuel tanks.I did put it in correctly,the arrow on the filter pointing to the front of the truck,and it ran fine after I changed the filter.

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This is not a solution , just a clarification. Did you change the fuel filter and put it back on in the correct direction or is the fuel line beyond the pump producing gas?

Posted on Oct 29, 2008

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Check whether you r getting sparks at ignition switch.
also check the fuel pump.
thanks.

Posted on Oct 29, 2008

  • fixexpert Oct 29, 2008

    on the ignition switch down by the hazard light control you will see a pin hole turn the lock cylinder to run push a small punch eighth inch iI think may bre smaller.then you will be able to slide the cylinder out may have to pry a little. If you don't have the key you will have to drill the pin out.

  • fixexpert Oct 29, 2008


    It could be a lot of things. Is there clicking when you try to turn it on? Does it turn over (act like it's trying to start, but engine won't fire)? Start but won't stay running?


    Start simple. Is the battery dead? Low voltage (almost dead batt) can also keep the truck from starting. Is it in gear? Must be in park for automatic, clutch in for manual. Is it out of gas? If it's been sitting, could be bad gas or clogged injectors. Starter could be bad too, as wel as ignition. Worst case is a seized engine, but if this is a sudden thing with no recent overheating or low oil pressure situations, it's unlikely.

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