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Old 03-01-2012, 04:48 PM
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Throwing code after fuel filters

I changed fuel filters out today and after starting my truck I had a code for low fuel pressure during cranking. I believe p2291. Could this just be from air in fuel lines?

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Old 03-01-2012, 05:23 PM
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Does it do it every time you start it? Have you let it set and run? Maybe drain it from underneath
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Old 03-01-2012, 11:38 PM
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Only did it first time and yes I did all necessary bleeds and let the pump run before starting, etc.
First time that I changed filters myself while having the mini max to tell me the codes.

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Old 03-01-2012, 11:46 PM
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After you cleared the codes and start it back up and all that good stuff does it still give you the code? If not I would say that it needed to build pressure up or yes maybe a little air in the line needed to work its way out. IMO
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Old 03-02-2012, 03:50 AM
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Hasn't done it since. Most likely just had some more air in the lines. Just makin sure.

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Old 03-02-2012, 07:04 AM
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Ya i wouldnt worry about it to much. Mine does it but once i clear it then it is gone.
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Old 03-02-2012, 06:12 PM
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you're lucky it started and ran after it threw the P2291, usually by the time it sets that code there's enough air in the system to cause some grief(aka no start).

if you're not already doing so ONLY change one filter at a time. change the lower, then start and run the truck for a few minutes, then change the upper. you'll avoid getting too much air in the system and potentially getting stuck.
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Old 03-02-2012, 07:54 PM
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What do you mean won't start? Will it damage anything?

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Old 03-03-2012, 06:43 PM
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there have been a few posts on here about getting too much air in the system after changinig filters and the truck won't build enough fuel pressure to start. after that happens, it usually takes a lot of cranking and bleeding to get enough air out to make adequate fuel pressure

it's happened to me twice now out of countless times i've changed filters on a 6.4
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Old 03-03-2012, 06:53 PM
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After changing the filters turn key to run let set for 30 sec. 4 or 5 times. It will start with no problems. But if it does turn to key to run and bleed air out of the schraider valve on top of the fuel cooler.

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