fuel issues

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Sep 13, 2012 | 12:55 PM

bigbrown1985

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fuel issues

ok so here is the deal. i have and drive every day a 1985 f250 6.9 and recently as im driving down the road it will start to spudder and sometimes accelerate for a second or two on its own. then sometimes it just dies, it has 3/4 of a tank and did it when full to the neck. could the fuel pickups be that bad?

Sep 13, 2012 | 01:08 PM

akamacgyver

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From: Denver, CO

What does switching the tanks do? I would try the diesel kleen in the fuel filter trick tonight.

Good luck,

Mac.

Sep 13, 2012 | 01:54 PM

86f350

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From: Whitestown, IN

Im guessing there is an air intrusion somewhere in either the return lines or the fuel water separator. That explain the acceleration on its own for a second

Sep 16, 2012 | 07:53 PM

bigbrown1985

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i run diesel kleen every few tanks and filters changed not to long ago

Sep 16, 2012 | 10:05 PM

IDIDieselJohn

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From: Ottawa, Ontario

My 7.3 started doing that a week or so before the lift pump died in the middle of winter.

Mine never died after it was running though.

Sep 24, 2012 | 03:41 PM

bigbrown1985

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lift pump didn't solve the issue trying return lines now

Sep 27, 2012 | 01:50 PM

bigbrown1985

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and neither did changing all of the return lines. whats weird is generally if i keep it right under 60 mph it won't do it soon as i go faster it does it

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Oct 19, 2012 | 08:49 PM

bigbrown1985

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problem solved, i took off and bypassed to fuel water separator and just left the fuel filter and now she's runnin strong

Oct 20, 2012 | 09:51 PM

#10

joshofalltrades

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those stock water seperators are prone to leaking from the drain. mine is patched with a piece of hose and a cap.
note that its wise to have some kind of water seperator in the system, so for the long haul it would be best to replace the water seperator or switch to the newer style fuel filter that has it built in