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.

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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Fuel gauge not working all the time.

This is a normal concern.
The instrument cluster uses 4 different operating modes to calculate the fuel level:
Anti-slosh (default mode)
Key OFF fueling
Key ON fueling
After a fuel fill up, the time for the fuel gauge to move from empty (E) to full (F) ranges from 2 seconds to 55 minutes depending on which operating mode the fuel gauge is in.
The default fuel gauge mode is called the anti-slosh mode. To prevent fuel gauge changes from fuel slosh (gauge instability due to changes in fuel sender readings caused by fuel moving around in the tank), the fuel gauge takes approximately 55 minutes to go from empty (E) to full (F).
The key OFF fueling mode (2 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The key must be in the OFF position throughout the entire refueling of the vehicle.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
The instrument cluster must receive a valid key ON fuel sender reading within 1 second of the key being put into the RUN position. The key ON sample readings are considered valid if the fuel sender reading is between 15 ohms ± 2 ohms and 160 ohms ± 4 ohms.
If these conditions are not met, the fuel gauge stays in the anti-slosh mode, which results in a slow to read full (F) event.
The key ON fueling mode (approximately 90 seconds to read empty [E] to full [F]) requires 3 conditions be met:
The transmission is in PARK (P).
The key is in the RUN position.
At least 15% of the vehicle's fuel capacity must be added to the fuel tank.
In key ON fueling mode, a 30-second timer activates after the transmission is put into the PARK (P) position (automatic transmissions). When the 30-second time has elapsed and at least 15% of the vehicle's fuel capacity has been added, the fuel gauge response time is 90 seconds to read from empty (E) to full (F). When the transmission is shifted out of PARK (P), the fuel gauge strategy reverts to the anti-slosh mode. The key on refueling mode prevents slow to read full events from happening if the customer refuels the vehicle with the key in the RUN position.
Recovery mode is incorporated into the instrument cluster strategy to recover from a missing fuel level input during a refueling event. Missing fuel level inputs result from intermittent opens in the fuel sender or its circuits. Recovery mode (empty [E] to full [F] approximately 20 minutes) is initiated when the following 2 conditions are met:
The instrument cluster is in the anti-slosh (default) mode.
The actual fuel level in the tank is greater than what is being displayed by the fuel gauge

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