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Ford 650/750 Medium Duties Technical discussion of the new Ford Super Duty 650 and 750 series trucks with Power Stroke, Cummins, or Caterpillar engines.

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post #1 of 2 (permalink) Old 11-01-2007, 11:10 PM Thread Starter
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fuel lift pump problems

I have a ford F650 with a Cummins motor.

The other day it started losing power and 'bucking' when under power. I am able to limp it home. I have read that there is a lift pump problem with the cummmins motors. Apparently the previous owner had changed the lift pump at around 30,000 I now have 53,000

I ordered a new fuel filter and lift pump from a cummins dealer....should be here tomorrow and I hope that solves my problem.

I also read that there is a second filter somewhere along the frame under the drivers area....but I can't seem to find anything....any suggestions on where to look.


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post #2 of 2 (permalink) Old 11-06-2007, 09:42 PM
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Re: fuel lift pump problems

The filter is near the left frame rail near the middle of the leaf spring. It looks like a sausage, literally. I is about 8 inches long, and about 2 inches in diameter. I have 3 of these model F650's in my city's fleet I take care of, and all 3 had the fuel tanks replaced under warranty at about the mileage you are at for defective, rusty tanks.
All of ours got so stopped up with rust they stopped running and had to be towed to Ford to be replaced. But if you have rust issues, changing the "sausage" pre-filter will help it run, and it will be completely full of rust. The retaining clips are easy to break, and hard to get, so go easy on them when changing the filter. Hope this helps.

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