CP4.2 Owners Club

[R.Taylor]

Well, There's a few of us here with our 2019 Ram Cummins Heavy Duty CP4.2 pumped 6.7 engines so... We should have a "club"... Somewhere we can reference back to for all and everything CP4.2 related here on TDR.

 

[Newsa]

You could call it the "Notorious CP4.2" club?

Until it starts flying under the radar?

 

[Wayne M.]

OK, I’m ready!

But seriously, this should not be happening! I sincerely hope that they provide a workaround and fast.

 

[TFucili]

I am hoping for the best.

 

[Cummins12V98]

Has anyone hear of any issues yet?

 

[Wayne M.]

I wonder about the possibility of developing an adequate screen after the pump and before the rail, to protect the injectors.

 

[Newsa]

I wonder about the possibility of developing an adequate screen after the pump and before the rail, to protect the injectors.

I read that they updated the pump with a screen or filter integrated into the pump. But i doubt it will be effective if you can't change or clean it.

Edit: unsure of the accuracy of what i read.

 

[jhenderson]

OK, I’m ready!
View attachment 116820
But seriously, this should not be happening! I sincerely hope that they provide a workaround and fast.

Work around for what? How many Cummins pumps have failed?

 

[R.Taylor]

So far (620 miles) now... I'm good. Not too worried about it. I live 11 miles from the Chevron refinery and only get fuel from one high volume station, We have fresh diesel for sure. OptiLube XPD since day one for the extra lubricity. Unlike the 3rd gens that would let you actually run out of fuel... These 4th gen trucks tell you your on empty when you sill have almost 6 gallons in the tank, Now when I fill up the tank from near empty as the gauge reads I'm actually only getting about 26 gallons in there, My 3rd gen fill ups were 32+ gallons. Running this CP4.2 dry would take a real bone headed move. Air seems to be the pumps biggest enemy. I wonder what percentage of failed CP4.2 pumps are due to bone headedness and not it's weak design. I mean the pump can't be that bad... I heard Volvo Penta will be using it on some of it's marine diesel engines. Like I said..... I am not worried, 8 years or 125k miles until I will.

 

[Newsa]

Work around for what? How many Cummins pumps have failed?

How many Cummins have been equipped with a CP4 or CP4.2 pump would be a pertinent question????

 

[R.Taylor]

Bosch has produced over 40 million CP4 pump variants since it's introduction in 2011. I'd be worried if there were 30 million failures.....

 

[Newsa]

Maybe it's just me. I'd be concerned about multiple class action lawsuits if i'm buying a $60-$90,000 vehicle

 

[DonFitzwater]

I heard Volvo Penta will be using it on some of it's marine diesel engines.

Volvo Penta is the Powerstroke of the marine world.

 

[R.Taylor]

Volvo Penta is the Powerstroke of the marine world.

I've put thousands of hours on both D4 and D6 common rail CP3 pumped Volvo marine diesels with no problems what so ever. Straight shaft, not I/O.

 

[TFucili]

I wonder about the possibility of developing an adequate screen after the pump and before the rail, to protect the injectors.

My buddy had one put on his Ferd. I think it was made by S&S Diesel.

 

[TCDiesel]

The Ram should fail better than the Ford and GM applications, the Ram Factory filtration is a step above GM/Ford.

I've Seen many CP4s last up to 500K miles, (all had auxiliary filtration) I've also replace them at 30K miles....Its weakness is simple..... Fuel quality.

If its fed good lube fuel it will last feed it bad or contaminated fuel and its only time before its $$$$ in repairs.

There will be a conversion Kit by late summer or sooner.

Those aftermarket kits or FCAs are IMO just a many grab, your way better off spending the $$$ on auxiliary Filtration or Transfer filtering.. and regardless of what the &^%*&^ companies tell you ......Never remove filtration add filtration...don't put any trust in those Hmmmm sellers.

 

[Wayne M.]

TC, I think you missed my point. My idea was to stop shrapnel from the pump to the rest of the system. I know the pre pump filtration is where it should have been in 2003.

I’m under the impression that this new 4.2 pump is having issues.
I honestly hope it is not.

 

[Ozymandias]

I’m under the impression that this new 4.2 pump is having issues.
I honestly hope it is not.

Of course it is not, because they are out on the market for just a couple months now.

Were are the issues? No where, it all about grampies ols furd with a cp4 in it a decade ago.

Here we are with the 4.2 and 10 years of r&d.

Not the same.

 

[AH64ID]

Of course it is not, because they are out on the market for just a couple months now.

Were are the issues? No where, it all about grampies ols furd with a cp4 in it a decade ago.

Here we are with the 4.2 and 10 years of r&d.

Not the same.

The 2015+ Ford's are seeming to be more reliable.

But don't fogert that it's not just Ford that has CP4 issues, as the 11-16 DMax's were also plagued with CP4 issues and have since dropped Bosch fuel systems.

Ford has always used a lift pump with the 6.7, while GM did not.

 

[TCDiesel]

The VM 3.0 (Ecodiesel) has the same Pump CP4 as the Ford, GM has the mounted GP the same as the 2019 6.7.

Once the CP4 starts to Fail its a particle maker, ( Unlike the CP3 ) the CP4 will contaminate Injectors. The CP3 combustion fuel is 100% separate from lubricating fuel of the internals.
The CP4 must run at 90-100% capacity to survive. Thats why all rail(s) run electronic relief Valve, this Valve allows excess fuel produce by the CP4 to return to Tank.

It is more pertinent to keep your fuel Tank full with CP4 Apl, IMO DO NOT ALLOW YOUR TANK TO DROP BELOW 1/4 DURING HOT SUMMER MONTHS, and when convenient keep it full.

Now to answer the lift pump needed for the Ecodiesel Ford, The COV is set at 55PSI+ on NONE GP pumps if it drops below this the COV WILL NOT OPEN, THUS CIRCUIT FOR COMBUSTION FUEL will closed, a NO start will occur.

The 6.7 CP4/CP3 only need Positive pressure for the GP to lift internal pressure of the Pumps.