I think my CP4 has started to eat itself....

[SnoKing]

If I start hardening up (read: petrifying) before a major malfunction.......I’ll head to GM or FoMoCo and try Brand Y or Brand Z for a bit.....

Say what?

GM = Denso HP4

FoMoCo = Bosch CP4.2 ????

 

[dieselshadow]

Say what?

GM = Denso HP4

FoMoCo = Bosch CP4.2 ????

And? Pick your poison.

 

[EDankievitch]

I just read that RAM is now offering a convenience package for the Diesels with the Cp-4.2 fuel pumps. It includes a folding bike and Satellite emergency cell phone.... the kit stores behind the seat.
RAM does not want any one to feel Stranded...







Lol

 

[Ram4Sam]

Guess what? My 2018 RAM 4500 is currently at 269k miles. Technically......I’m at a mileage range (and out of warranty, I may add) that ANYTHING can happen. CP3 puke? Throw a rod through the side of 6.7L? AS69RC puke? Transfer case puke? Front or rear axle puke? Turbo take a dump? Wiring harness melt like a Hershey bar on a S’mores?

In any event.......every time I turn the key could be an adventure.

My point is......I don’t live in fear. I deal with it if and when it’s dished out.

I have a Citi Preferred card in my billfold (member since 1988) with zero balance and a $25,000 credit limit. If the schittttttttt hits the fan.....I’ll pull it out, deal with the situation at hand, and move forward.

If I start hardening up (read: petrifying) before a major malfunction.......I’ll head to GM or FoMoCo and try Brand Y or Brand Z for a bit.....

Would you buying me lunch fall into this apocalypse..........

Sam

 

[Ozymandias]

This is really sad, as I see RAM "working" on the road all the time. It has been the go to vehicle because of reliability. Now to have the CP4 cloud over it is a great mistake on Cummins' and RAM's part to use this injection pump. Bosch should be ashamed to have created such a product and continuing to market it despite the known issues. All the bean counters in this path to the lowest cost item should be made to drive vehicles with CP4 pumps.

There is a bazillion cars and machinery out there on the road equipped with CP4s and running strong.

 

[DonFitzwater]

There is a bazillion cars and machinery out there on the road equipped with CP4s and running strong.

Oh Ozy, haven't you heard, THE SKY IS FALLING!!!

 

[EDankievitch]

I think what is causing the CP-4.2 to fail a bit more often in the Ram Cummins application is simple harmonics. Less cylinders more time between injectors firing than a 8 cylinder engine. A harsher internal vibration. Could be why they changed the cam profile on the later pumps? Any engineers out here have thoughts?

 

[gsbrockman]

Would you buying me lunch fall into this apocalypse..........

Sam

Perhaps

 

[AH64ID]

I need to dig into the 19+ pressure tables one of these days.

I updated my UDC software and got the new stock demo files for 19+.

They do command up to 29K psi and will do so near WOT starting at 2200 rpms, the load required for 29K drops as rpms increase. At 2800 rpms it will go to 29K with around 60% load.

 

[nukegm]

I just read that RAM is now offering a convenience package for the Diesels with the Cp-4.2 fuel pumps. It includes a folding bike and Satellite emergency cell phone.... the kit stores behind the seat.
RAM does not want any one to feel Stranded...







Lol

BELLY LAUGHTER!!!!! thanks comrade. needed that. cheers!

 

[Bug Out]

This is really sad, as I see RAM "working" on the road all the time. It has been the go to vehicle because of reliability. Now to have the CP4 cloud over it is a great mistake on Cummins' and RAM's part to use this injection pump. Bosch should be ashamed to have created such a product and continuing to market it despite the known issues. All the bean counters in this path to the lowest cost item should be made to drive vehicles with CP4 pumps.

Absolutely. I bought and never even thought to research. I had blind faith in RAM/Cummins to do what was good for reliability as thats what they are known for. Blindsided by this totally....yeah, I know...Counseling, meds etc...blah blah. I get it. Too bad I didn't look first. Dumb ass etc.

 

[Bug Out]

BELLY LAUGHTER!!!!! thanks comrade. needed that. cheers!

LMAO !!! Perfect On the bright side, I have already kept 3 people from buying RAMS including my daughter who was stunned to hear me say, NO to RAM/Cummins.

 

[AH64ID]

LMAO !!! Perfect On the bright side, I have already kept 3 people from buying RAMS including my daughter who was stunned to hear me say, NO to RAM/Cummins.

What did you steer then towards?

A Ram is still the only truck I’d buy new today.

 

[HPSimpson]

What did you steer then towards?

A Ram is still the only truck I’d buy new today.

A great looking Ford truck!

 

[TFucili]

Two of my friends just bought L5P Duramaxes. I didn't try to talk them out of it, and that's a change for sure.

 

[AKDoug]

LMAO !!! Perfect On the bright side, I have already kept 3 people from buying RAMS including my daughter who was stunned to hear me say, NO to RAM/Cummins.

Is yours still running? I have a 2019 with 35K miles.. first truck I've ever owned that didn't have an issue in the first year. Your choice in diesels in 2020 is two with CP-4s and one with a brand new untested transmission.

 

[Jim W]

I think what is causing the CP-4.2 to fail a bit more often in the Ram Cummins application is simple harmonics. Less cylinders more time between injectors firing than a 8 cylinder engine. A harsher internal vibration. Could be why they changed the cam profile on the later pumps? Any engineers out here have thoughts?

What about a 4-cylinder engine they also use the CP-4 pump?

This is just my gut feeling so, take it for what it is worth.

With the CP4 being so sensitive to fuel issues. I have instructed my wife never to allow the fuel tank on her Jetta to go below the 1/4-mark level on her fuel gauge. Now for her car this means that there is approximately 3 to 4 gallons of fuel left in the tank. This is still allowed to circulate in the fuel system to keep the fuel pump lubricated and cooled. (Knock on Wood) So, far we have never had an issue with her car's CP4 fuel pump.

I have asked on the VW TDI forum about fuel pump issues in the past with users who had failed the CP4 pump. None of them would respond if they let the fuel tank run almost dry before fueling up. Such as when you get the low fuel light warning on the dash. It would be interesting to note if the rare fuel pump failures on the Cummins engine with the CP4 fuel pump is also due to low fuel levels? With the low fuel level light being displayed and you get a ding!

I know from my past life when I worked with ROTARY HYDRAULIC PUMPS that used fluid to cool them. It was important to keep the fluid clean and flowing so, the swash plate would not score thus allowing the pistons to slip and the pump to cavate. Thus, destroying the pump and send debris downstream.

 

[Wiredawg]

Friends,

FWIW, if I was in need of a truck, I think I would low ball offer to buy the 5 or 6 chronic complainers who owns 19+ MY Ram Cummins truck and put the lucky taker out of thier misery. I simply can't imagine owning anything I didn't like or was skeered of.

I wish all of you haters the best in of luck getting rid of your trucks and joining a forum where you can hate your next BIG mistake.

CHEERS, Ron

 

[EDankievitch]

Is the 4 cylinder Cp-4 a twin piston pump or a single piston pump? I don’t have answers. I’m just an old engineer trying to come up with a solution. Yes the pump design has a bad track record here in the USA. But why? Is Europe fuel that much cleaner? Or has it a better lube additive? Or are they having the same failures and just sweeping it under the rug. They changed the cam profile for a reason. Could it be a simple harmonics issue?

 

[Ozymandias]

Single piston for the smaller engines, it depends on the displacement of the engine, not on the count of cylinders

@Jim W
If your VW is specd as ours you'll find a fuel return cooler under the vehicle, usually right under the passenger seat area.
It's a flat aluminum heat sink design.