Won't start after installing CP4 bypass - Ford Powerstroke Diesel Forum
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post #1 of 11 Old Yesterday, 04:23 PM Thread Starter
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Won't start after installing CP4 bypass

I installed my disaster prevention kit today. I got it all put back together and it won't start. I cycled the key 6 times like after changing the fuel filter. Repeated that process a couple times and still no luck.
Any suggestions? I watched the video again to see if I missed anything and didn't see anything that I missed.

2015 CCLB, DRW, 4X4, Lariat ultimate. 167k miles full delete @ 157k mi. SCT Livewire with Tyrant tow tune

Last edited by broncobilly_69; Yesterday at 08:21 PM.
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post #2 of 11 Old Yesterday, 08:20 PM Thread Starter
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Pulled it back apart and couldn't find any smoking guns. The O ring on the metering unit looked a little rough, so I found what seems to be a suitable replacement. Hopefully nitrile rings are suitable for diesel applications.
I cycled the key with the supply line disconnected, over a container. Man it puts out a lot of fuel fast! I almost overfilled my quart container before I could get to the key to turn it off.
If no one has any insight for me, I'll finish putting it back together in the morning and see what happens.

Last edited by broncobilly_69; Yesterday at 08:24 PM.
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post #3 of 11 Old Today, 10:00 AM Thread Starter
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She still wonít fire. Doesnít seem to be much coming out of the exhaust when Iím cranking. Is there a sensor in that area that I may have accidentally disconnected or a wire that could break/cut that would cause a no start situation? Iím really stumped on this as it is getting plenty of fuel to the bypass block.


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post #4 of 11 Old Today, 01:02 PM
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I don't have an answer for you on your no start, but I can answer the Nitrile compatability with diesel.

Cole Parmer rates it as excellent. They have a great database of chemical compatabilities. Nitrile is listed under Buna-N

If you do a google search for Cole Parmer Chemical Resistance, a link will come up. I can't post links yet otherwise I would post it.
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post #5 of 11 Old Today, 03:28 PM Thread Starter
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Can FORscan be used to test rail pressure or any other parameters with the fuel system? I have an OBD two plug, but have never actually used it.


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post #6 of 11 Old Today, 04:08 PM
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There was a problem on this forum about similar issue with the kit they installed.

https://www.ford-trucks.com/forums/1...ggestions.html

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post #7 of 11 Old Today, 04:49 PM
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Take the kit off and go back to stock and see what happens.


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post #8 of 11 Old Today, 05:47 PM Thread Starter
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I think I figured it out.
I'm a dumb a$$, bad part, and I'm a dumb a$$.
It looked like a pretty simple kit, not much to it and I don't care about CARB compliant, so I saved a 100 bucks getting a no name kit off amazon. I looked it over really good when it arrived knowing I could return it if it didn't fit. In looking if over I noticed a flaw going into the MPROP portion of it. Being a dumb a$$ and not fully understanding exactly how the kit worked I didn't realize that the flaw was a passageway that didn't quite go all the way through. The passageway that brought the fuel to the top end of the pump. I have drilled it out and cleaned the hell out of it. I had to break for dinner, but will putting it back together shortly. I will update, but I'm pretty optimistic.

Thank you to everyone that offered insight!!
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post #9 of 11 Old Today, 07:04 PM Thread Starter
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VICTORY IS MINE!!!!

She fired right up.
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post #10 of 11 Old Today, 11:00 PM
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If you didn't run into issues, how long did it take you from start to finish?
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