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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Fuel Issue??

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Old Mar 29, 2022 | 07:43 PM
  #1  
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Fuel Issue??

I recently purchased a 1992 Ford F-350 Dually 5.8L with a service rack. For the first month or two it has been running perfectly fine. Recently it has started to hesitate, stumble and misfire once warm, after about 5/6 hours of daily driving is when the problem comes about. If I pull over and stop at the gas station and add fuel, the problem goes away for a short time. I’ve also found that lightly applying gas helps relieve the issues. Any ideas of what I’m dealing with? Replaced ignition coil and cleaned throttle body
 
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Old Mar 30, 2022 | 06:28 AM
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How old are the spark plugs, wires cap/rotor?

Has the fuel filter been changed recently?

Have you checked the fuel pressure at idle and under load?
 
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Old Apr 1, 2022 | 08:27 PM
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I have chased the same issue on my 88 350 with a 460. I replaced all injectors, fuel pressure regulator, both pumps, fuel filter, distributor, ECM, control module, plugs, wires, all vacuum lines, all sensors and stalkedvagaun yesterday after about 300 mile of running fine. Tomorrow I am replacing the tank selector valve and gas caps. I know the selector valve has failed I am curious to see if this was the problem $3500 ago.
 
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