Loss of power and knock - Ford Powerstroke Diesel Forum
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Old 06-07-2010, 01:13 PM
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Loss of power and knock

I bought a 00 f250 about 3 months ago and had to put a new CPS on it right away and have not had the first problem with it since then, but I was driving home saturday night and it skipped twice and then about a mile down the road it just lost power to the extent that it barely even make it up a small hill. It has knock to it that sounds like it might be a fuel knock... I checked the oil and it was 3 qts low filled it up with oil and it still runs very rough and will not get over about 15 mph.
I dont really know where to start, I checked a few of the sensors to make sure none came unplugged but it wasnt taht easy

Any one got any suggestions as to what it might be?

Thanks,

Ben
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Old 06-07-2010, 01:25 PM
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I agree that it sounds like a fuel knock from your description.

The 7.3 does not measure fuel pressure anywhere. It has a circular fuel system, with fuel being pumped from the tank, through the filter assembly, out past the pressure regulator, and back to the tank.

I would make sure your filter is clean, and then if that isn't the problem, I would put a pressure gauge on it (there are two ports on the fuel filter assembly you can tap into) and make sure it is running between 55-70 psi. If not, things to check are the fuel pickup assembly in the tank (including the two screens inside the mixer assembly) as well as your lift pump. The regulator is nothing more than a spring loaded valve, so there isn't much to go wrong - but occasionally they stick open. Shouldn't be too hard to track down.
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Old 06-09-2010, 05:37 AM
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Got my truck back yesterday afternoon, the turbo was froze up... he got it unfroze but I am sure it wont be long until I need a new one...
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Old 06-09-2010, 06:19 AM
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You might want to rebuild it before it lets go. If it was just a stuck sleeve bearing, it should be an easy rebuild. If the bearing deteriorates, the impellers could get ground off and raise your repair bill.
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