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post #1 of 12 (permalink) Old 07-10-2019, 02:31 PM Thread Starter
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P2291

Driving home and my '15 f350 6.7 flashes Reduced Engine Power, dies and will not start back. At first it was giving p2291 code. I noticed fuel wad under 1/4 tank, added fuel. Tried starting again, nothing. I have changed the fuel pressure/temp sensor, fuel filters, fuel lines from low pressure pump to rail,and low pressure filter housing. Need ideas!!!!
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post #2 of 12 (permalink) Old 07-10-2019, 04:00 PM
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Remove the volume control valve On the high pressure pump and check to see if there’s metal or other debris in it.

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post #3 of 12 (permalink) Old 07-10-2019, 08:09 PM
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Do you hear the low pressure fuel pump run with KOEO? What is your actual high pressure fuel pressure while cranking ?

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post #4 of 12 (permalink) Old 07-11-2019, 11:18 AM Thread Starter
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Yes low pressure pump runs. Had mechanic check pressure while cranking. He said 400psi. I have changed filters twice and check for water and metal both times. It's clean.
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post #5 of 12 (permalink) Old 07-11-2019, 11:20 AM Thread Starter
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What are the chances of it being the fuel rail pressure sensor?
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post #6 of 12 (permalink) Old 07-11-2019, 11:45 AM
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You said you changed it? Did you remove the VCV on the pump to check it? It’s possible I suppose. It’s also common for the wiring pigtail to fray right at the FRP sensor. You can also remove the fuel regulator at the back of the drivers side fuel rail to check for debris and or rust

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post #7 of 12 (permalink) Old 07-11-2019, 12:22 PM Thread Starter
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The sensor I changed is the one one the fuel line. It is directly in front of the upper filter.
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post #8 of 12 (permalink) Old 07-11-2019, 12:25 PM Thread Starter
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Also yesterday it popped a crankshaft position sensor code. I am guessing that is most likely from the extended cranking?
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post #9 of 12 (permalink) Old 07-11-2019, 04:59 PM
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PRObably due to excessive cranking. If you have sufficient fuel pressure I would say chase that code but with 400 psi it will never run.

The high side pressure sensor is on the front of the drivers side fuel rail. The fuel pressure regulator is on the back of that same rail. The VCV is on the top of the HPFP.

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post #10 of 12 (permalink) Old 07-11-2019, 05:34 PM Thread Starter
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What kind of fuel pressure should it have while cranking
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