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Old 07-08-2008, 07:59 AM
jeffdoerr jeffdoerr is offline
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P0191 code on 5.4, had plugged filter, still have code

This is on my e350 van, 05 with a 5.4. Just rolled over 100k and I was in VA in the hills with a load and I lost power. Barely (like 10 mph) made it to the top and then it was fine again. Did this every time I needed to climb a hill and was loaded. Will not lose power when empty, just loaded. I went to a chain autoparts store and had the tart there pull the code for me and it was a p0191. He looked it up and told me I had a bad fuel pressure sensor and that it was a dealer only item. So, off I went a few hundred more miles and it was still a problem, I went to a real parts store and I changed the fuel filter at the first chance and it was bad, looked like mud coming out of it. I also put in dry-gas and ran premium the rest of the trip. It was much better, but will still, ONLY WHEN LOADED, will lack power, like the engine is losing fuel.
The 191 code is a fuel rail pressure sensor, my question is are these sensors prone to failure or is this a diffrent problem ?
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Old 07-08-2008, 08:25 AM
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Not sure if that is really the problem but here is a link to the removal/installtion of the senor.

2005 F-Super Duty 250-550 Workshop Manual

You may also want to look at your filter again. If you have that much gunk in it when you replaced it you may have got something in the tank and the new filter is plugged again.
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Old 07-08-2008, 11:59 AM
jeffdoerr jeffdoerr is offline
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I changed the filter a second time as soon as I got home and it was clean. thanks for the link.
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Old 07-08-2008, 01:42 PM
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How is your fuel pressure?
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Old 07-08-2008, 01:42 PM
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