CP4 bypass kit

While the newly designed CP4 pumps that go onto the 2015+ trucks appear to be more reliable, you are SOL on the 2011-2015 trucks in regards to Ford doing anything. The bypass kits do not seem to be that common on this site because most here seem to think that their brand makes a perfect truck and modifying it is heresy. Outside of these forums in the diesel modding world, these kits are very common. My brother was going to do it on his 2012 F350 before he decided to trade it in on a 2014 Ram 2500.

Isn't the bypass kit about $300? It's cheap insurance. I wouldn't want a diesel with a CP4 in it, but if I had one the bypass kit would be a no brainer.

^^^ I agree it provides a level of insurance. I usually spend as little on insurance as I can get away with. There is a very low percentage chance that you will see any return on that $300 but I guess if you do it could save you a few thousand dollars.

ShinerBock wrote:
While the newly designed CP4 pumps that go onto the 2015+ trucks appear to be more reliable, you are SOL on the 2011-2015 trucks in regards to Ford doing anything. The bypass kits do not seem to be that common on this site because most here seem to think that their brand makes a perfect truck and modifying it is heresy. Outside of these forums in the diesel modding world, these kits are very common. My brother was going to do it on his 2012 F350 before he decided to trade it in on a 2014 Ram 2500.

Since you’re bashing the owners of their perceived perfect truck why are your advertising your brother trading a truck for a 2014 Ram.

Sounds like your brand marketing again!

FishOnOne wrote:

ShinerBock wrote:
While the newly designed CP4 pumps that go onto the 2015+ trucks appear to be more reliable, you are SOL on the 2011-2015 trucks in regards to Ford doing anything. The bypass kits do not seem to be that common on this site because most here seem to think that their brand makes a perfect truck and modifying it is heresy. Outside of these forums in the diesel modding world, these kits are very common. My brother was going to do it on his 2012 F350 before he decided to trade it in on a 2014 Ram 2500.

Since you’re bashing the owners of their perceived perfect truck why are your advertising your brother trading a truck for a 2014 Ram.

Sounds like your brand marketing again!

Awe, did someone get their feewings hurt because they can't handle the truth.

For those not familiar with the situation: Bypass kit

ScottG wrote:
For those not familiar with the situation: Bypass kit

Exactly! The kit does not keep the CP4 pump from failing, it just keeps a $1k repair from becoming a $10k repair. This is why my brother was about to install the kit before he traded in his truck. His pump was showing signs of failure and he did not want a $10k repair bill like my cousin and another friend had in their PSD's. At the last minute he decided to just trade it in on a CTD.

Sorry if this is going off-subject but does anyone know if replacement HPFP's are better or modified in some way to help prevent this?

ScottG wrote:
Sorry if this is going off-subject but does anyone know if replacement HPFP's are better or modified in some way to help prevent this?

That’s a good question.

Nobody really knows if any improvements have been made to the design but we do know that improvements have been made to the fuel filtration.

Some are even saying that since Cummins is now using the CP4.2 pump that improvements probably was made with no data to back it up.

I think it's a good addition (without data to back it up personally) ot insurance. $300 vs $10k is an easy choice in my mind. Like dropping $200 on a secondary fileter for my 5.9 Dodge. Did lack of filtration kill my injectors in 120k miles? Idk. Will I put more than another 120k miles on it? Thought i was back in 2014, but now she sits and only gets one oil change worth of miles a year.

What I wonder about the bypass kit, looking at the schematic...
Before the kit, all the fuel ran through the whole pump providing lube (and cooling?) to the pump. Then when the pump spit it's guts (which has been revised in the CP4.2 design), the guts went out with the fuel to the rail.
With the new design, does the pump just run on whatever fuel is left in there? Ie, getting dirty/old/contaminated?

Also, why has S&S not marketed a kit for the Duramax, same pump, same issues (but purportedly better warranty coverage)?