Question about 1986 Ford F 250

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I have a 1986 ford f250 6.9 disiel and I am having starting problem and only when it sits for 6 hours or longer. I just bought it like a week ago and the guy had it for one year. He said he just replaced the glow plugs before I bought it and the gas fillter looks new. He said he got the truck and it was runing on the rear tank he ran it out and swiched it to the frunt tank and been runing on the front tank for about one year now. I just replaced the return fuel lines and still the same problem. I just put some addative for disiel injecters cleaner- booester-fuel treatment ran the tank out and now I put some addative for cold start in the fuel and still the same problem. Im getting power to the glow plugs. When i let it set for like 4 hours its cold but it fires right up. I just put some some fuel in the rear tank because it might have been dry to the bone and while i was driving back i swiched it to the rear tank and drove for awile and i just parked it now so ill have to wait and see if it will fire in like 8 hours..... What should I do Next? any info would help out alot thanks. oh the temp is about 40f' out here right now.

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  • mdcliff Jan 03, 2011

    Does it have a block heater? Usually 40 degrees Fahrenheit wouldn't cause much of a problem....


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When my 86 6.9 does that i change the glow plugs and that takes care of it , but i don't have a problem with my fuel tanks . you can check the glow plugs with a ohm meter they should read a certain amount , you can ask your auto parts store how much ohm's they should read . hope this helps you .

Posted on Aug 05, 2012

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With the older diesels if you run the tank dry you could airlock the injector rail. to bleed them you must crack the lines up top while the pump is running. engine off. due to high pressure.

Posted on Jan 03, 2011

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