WCFab - CP4 Fuel System Saver for LML Duramax 

Show me that it works and you can take my money .....

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Will a 25 micron filter stop *all* metal particles from getting into the injectors after the CP4 fails? Seems like this is more of a half-measure, rather than addressing the real issues: no lift pump and poor design of the CP4.

Let’s be real, even after the CP4 shits the bed, and assuming you have this installed. The mechanic is still gonna condemn the fuel rails/entire system. It’s his name on the repair.

If the CP4 goes out after installing this Exergy Metering Valve, How can you be sure that No Metal Shavings passed through the Exergy Metering Valve? Is there other place to look for to be sure?

Recently my uncles lml had a Cp4 fail at 130k. I know he doesn’t maintain his trucks very well, meanwhile my dads lml is still going strong at 180k but his truck has an air dog lift pump along with aux cat water fuel separator’s. We’ve been weighing heavily on weather to go with the Cp4 system saver or do the cp3 conversion and we ended up going with the cp3 conversion. Our reasoning being that i couldn’t find anyone who had installed one of these savers, had their cp4 fail, and it saved their injectors and fuel system. Not to say it doesn’t work I just couldn’t find any evidence to prove it first hand. Secondly it’s worth the extra expense to take the time to do it when it’s convenient rather than have it leave us stranded when it’s inconvenient. Third it’s just worth that piece of mind to know its not going to be an issue. It will be interesting to take the old Cp4 apart tho and see what kind of condition it’s in, and if all the initial measures of installing the extra filtration, water fuel separation, fuel air separation, and positive fuel make a difference. I might take it apart and find shavings showing it was on its way out or it may show no evidence of failure. I’ll find out this weekend.

Have you had any feed back on the system saver yet

Hey guys, is there a video out there that shows how to install the exergy inlet metering valve? If not would you do one or let me know where to get instructions on how to install it?

i guess the big question is " how large of particles can the injectors safely ingest"? if they can manage 25 micron and smaller this would do the trick.

Come in GM 80 micron? Geez might as well use a screen window

Is there any way possible to have an extremely fine micron filter after the pump and before the fuel enters the fuel rail ??

Don't waste your time with this thing, super cheap made in china junk. Just 3 weeks in and got a P0089 code and took it out to find the molded metal part around the screen was already coming apart (guessing because of the high pressure, not made for that) so would do you no good even if they just sold you the screen. Soon as i put the OE sensor back in, no more code. I bought another one a year later and not even trying you can destroy the rings that holds the screen with the lightest touch. Absolute junk, i haven't tried any of the disaster prevention kits yet, i've just been always using additives like extreme lubricity, better than worrying about the screen parts coming apart. If they were using the OE part (BOSCH 1462C00998, made in Germany part) and made the metal parts holding the screen better that could hold the pressure, i could see this working, but they're just using cheap china junk and charging 3 times what you can buy the Bosch part for xD, this is honestly beyond embarrassing.

Ok guys I had my cp4 fail on my lml with 105k on it thank to the system saver I put the updated cp4 and back in action also put a new system saver for piece of mind

I will definitely add this to my truck along with a lift pump once it goes out of warranty

How can you tell if the injentors were not damaged or contaminated after the CP4 breaks down and you have this Exergy? Thanks

I have one installed on my 2015 LML but haven’t heard of any actual cases where it saved downstream equipment, injectors, lines etc???

I do not recommend unless you want your truck to no longer start after vigorous ways to get it to start again, installed now cranking and no start. Even priming won’t help, my truck ran amazing before just wanted to do a little upgrade.. WARNING do not do this.

This thing doesn't do anything. I'm currently replacing an entire fuel system that had one installed.

Is a loong crank on my 2013 LML before it starts a sign of my CP4 about to fail?

Wouldn’t it be beneficial if someone made a filter to install on the high pressure lines going to the injectors? Or am I seeing what basically is a filter on the high pressure side ? Do you recommend a lift pump as preventative measures also? All stock, 2013 LML I have no intentions of tuning or mods.

Will this work for the Ecodiesel CP4 pump as well?

I have a 2016 lml with 252000km on it. I've noticed it surging lately, but only while I'm in gear and truck is stopped. Could this be a sign the cp4 is weakening ?

I love how your marketing this product as a product that will save your cp4, you clearly stated in writing on your thing that this MROP will prevent catastrophic cp4 failure and that's false, this will not save your cp4, maybe do your false advertising someplace else. People this only saves the rest of your fuel system in case of failure.

I bought this exergy saver brought it to a garage he couldn't start it after installing it , evidently he spoke with exergy and got it started, I paid him now my truck is not running right like it starving for fuel please help and keep saying to replace fuel filter and I did. This truck will not go fast at all no power. Mechanic convinced me it need a new pump si I ordered a cp3 conversion carb compliant pump and hoping this is the problem and I'm not just throwing parts at this. If anyone has information please give a helping hand thanks

Please make for Ford

Will this work on a Jeep Grand Cherokee Diesel 2018?

Will this work on a VW CP4?

Is this a part that can be self installed? Do you need a dealers computer to install?

It’s a bunch of bs

Where can l find this part? I’ve got a 2013 Chevy Silverado 2500HD 6.6L Duramax with 143,300miles on it.

Pay 10k on my new fuel pum injectors on my 2014 lbz 😔

If your deep enough in the motor to get to the top of the cp4 just change it with the new version. This makes no sense to me

Do you have one for the 2019 ram cp4 2500?

We’re do I buy it

So there is still a chance of contamination getting in if it doesn’t cut the engine fast enough

send to Brazil?

Nice

Great idea. Will this work on my 2015 ford f350 with that same cp4 fuel pump? Also what would be the cost of a upgraded fuel pump? Thanks

Is there a video on installing this? I plan on purchasing after 100k Factory warranty goes out....

Thanks for the info...ill be doing this to my 12 lml.

Do you have it for the powerstroke?

How much is this pump

Is this lift pump friendly?

Do you recommend if I have cp3 pump ?

I purchase this.Dealer told me 12.8 hours of labor to install.Is that correct?

I installed mine, install was easy, my truck started like normal after install and then died within seconds and only cranks now. I purged fuel line to make sure air was out and it still only cranks. My truck ran awesome before I touched it. I just order stock OEM regulator to swap back in and hopefully it will start and run awesome again, at this point I wish I never touched it, it somehow turned into a nightmare and not sure what's going on.

So in your opinion... considering the cost (roughly 3k) and lack of emission intact CP3 conversion kits, should we assume this is really the only protection/solution we have (in addition to running a lift pump and lubrication additives) on a emissions intact LML?

Thanks for the video Jason. Do you have any pics of a failure with this installed?

Would this fit or any chance you can design on for the Ram Ecodiesel which uses the CP4 pump.

Has this issue been rectified on the l5p, if not does exergy make a metering valve for a l5p

2 confirmed case's that the system saver failed done by a un biased 3rd party shop,which is what I was waiting on,of course wehrli wont say they failed.240 dollar paper weight.cp3 conversion is the only remedy.

Why wont you guys release confirmed saves,seems like in every duramax forum exergy and vendors dance around the topic.I have 1 in a box on my bench but till I see proof that's where it will stay.

Do we know of anyone having pump failure with this system saver on?