Question about 1985 Ford F 250

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85 F-250 diesel (6.9) fuel problem 4spd 2wd

I guess I'll start at the top. When I start the truck, the accelerator works excellent, I floor it, it goes! When the truck warms up, it shuts off when down shifting, or coming to a stop. Starts right back up as if there is no problem, but then, when you give it some fuel, you can honestly floor it and probably count to 3 before it even attempts to move. I also realized that if you rev it, and flutter the accelerator while at high rpms, it has excellent response. Also, if you are driving at a constant speed, and decide to floor it, there is a large delay there as well. I am not sure if I have trash in my lines, or what. I also had a leak on the fuel return line, and it has been repaired, got all air out of the lines, and problem is not fixed. PLEASE HELP!!

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First, double check that all the air is out of the lines, there may have been a stray bubble that got missed the first time. If that doesn't do it pick up Haynes Diesel Engine Repair Manual, Part # 10330 at your auto parts store. It lists a few potential problems and solutions for this . It also covers your specific engine in good detail, well worth the roughly $20 it costs.

Posted on Jun 22, 2009

  • dave-munroe Apr 29, 2011

    Check valve right at return line on injector pump is full of junk I bet. Pop it out and clean with carb medic. Be gentle when operating the valve. I use a tooth pick to move plunger back and forth whilt carb cleaner flows thru. **** will come out of there that you never thought existed. Keep cleaning until no morw gunk comes out. Thats the problem I have with my truck several times. Fuel filters cant keep all the stuff out. Once I clean mine, its like a whold new engine. More power than I know what to do with. And once valve is cleaned, truck burns no more smoke. Nice and clean.

  • cy schousboe Apr 29, 2011

    Thanks for the hint, never would have thought of that initially.



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