[ram19]

" Over the years there have been many failures of this pump due to the plunger rotating in the bore leading to the roller bearing grinding on the cam lobe and sending metal throughout the system. The design of the roller-bearing and cam lobe create inertial force on the plunger to keep it in the proper alignment and it should never rotate if the roller wheel and cam always stay in contact. However, there are situations internal to the pump when there is not enough downforce on the plunger to keep it in contact with the cam lobe. This is the core issue of why these pumps can fail."

This is from GDE's post here about what is actually happening with the CP4 pump failures. After reading this, I'm not convinced that any type of fuel additive would or could help prevent these pump failures.

 

[speeder37]

Buy from a reputable fuel source, use a fuel additive, and you'll be fine.

Not exactly correct. I use HotShots Diesel Extreme at every fill since tank #1. (Recommended by a fleet buyer friend of mine) I have an account at Shell and use Shell always unless traveling and then use others rarely.
Still experienced pump failure on my 2022.
Seems like it is luck of the draw.

 

[biodiesel]

Not exactly correct. I use HotShots Diesel Extreme at every fill since tank #1. (Recommended by a fleet buyer friend of mine) I have an account at Shell and use Shell always unless traveling and then use others rarely.
Still experienced pump failure on my 2022.
Seems like it is luck of the draw.

A few things. (1) Diesel Extreme should only be used once every 6 months, not at every fill up. (2) Make sure you're using a good fuel source. It doesn't happen often, but you can buy diesel that's been cross contaminated with gasoline. That will take out a CP4 pump. You have to remember, the failure rate on a CP4 pump is super low (1% or less).

 

[CraigGuy]

A few things. (1) Diesel Extreme should only be used once every 6 months, not at every fill up. (2) Make sure you're using a good fuel source. It doesn't happen often, but you can buy diesel that's been cross contaminated with gasoline. That will take out a CP4 pump. You have to remember, the failure rate on a CP4 pump is super low (1% or less).

Recommended Frequency:
Use one treatment of Diesel Extreme every 6000 miles.

This is what I found on their web page>>>>>>Copy and pasted

 

[biodiesel]

Recommended Frequency:
Use one treatment of Diesel Extreme every 6000 miles.

This is what I found on their web page>>>>>>Copy and pasted

That's correct. They have recommended both 6,000 miles and 6 months over the years. Either way, it's not something you add at each fill up.

Here's the 6-month recommendation based on a technical data sheet:

HSS-DE-TDS.pdf (netdna-ssl.com)

 

[speeder37]

Got the word today that my truck will be ready mid next week. Not as bad as the dealer was first thinking. They are putting the same fuel pump back in for now. Have to wait in line for the recall pump to be developed.
Service Manager did say no additives whatsoever going forward.
It will be nice having it back.

 

[ncskibum]

Is he saying that using additives will void the warranty?

 

[biodiesel]

Service Manager did say no additives whatsoever going forward.

Your service manager is a joke.

 

[CraigGuy]

This is what I am using right now. In Wisconsin and it is really cold here now.

 

[CraigGuy]

I think once summer comes then I will switch to their summer formula, but maybe ever other tank full.

 

[speeder37]

Your service manager is a joke.

No, he did not say anything about an additive voiding warranty.

 

[biodiesel]

No, he did not say anything about an additive voiding warranty.

He's a joke for saying no additives whatsoever going forward.

 

[Hammer]

i've run diesel kleen in 9 out of 10 tanks since the day i bought it, we almost at 90k miles folks, fingers crossed, no parts. home heating oil with a dye in it shouldn't be also branded as diesel but here we are!! here's an idea, the EPA and the manufacturers get together and say ey yo, you asking for shit we can't do and most people don't want so how about we calm down with the EPA fuel mileage stuff until the grid can support electricity? sorry, i went off topic.

hot shots is suppose to be the best by independent testing right? my issue with it is, it's not every tank of fuel and considering my aforementioned comments about home heating oil with a dye in it, I'm hesitant to put that garbage in this highly refined tight tolerance pristine italian piece of artwork machinery without the additive despite so many others having success. the scenarios just aren't good, it doesn't seem to take much bad fuel to waste one of these bearings or at least start the process. 6-8 months sitting at the dealer driving some beater rental while they get a new highly refined italian mozart engine to run on locomotive fuel or add an additive for a couple bucks a tank? i'm in the additive group.

 

[speeder37]

Just to add a little closure regarding the fuel pump replacement. They needed to replace the pump, fuel lines, injectors and battery.
the truck was fine for a week and then began to pour fuel out of the passenger side of the engine. Apparently, there were a couple of pinched o rings on the injectors. It died and luckily would not restart.
That was around two weeks ago and I don’t have the truck back. Waiting for parts again.
Losing confidence in the truck, although, the last issue was a clear mistake made by the mechanic.
As of today, this 11000 mile truck has been down 2 months.
Another issue in the near future, and I might give up on it.
The new GM Diesels look pretty solid.

 

[CraigGuy]

Just to add a little closure regarding the fuel pump replacement. They needed to replace the pump, fuel lines, injectors and battery.
the truck was fine for a week and then began to pour fuel out of the passenger side of the engine. Apparently, there were a couple of pinched o rings on the injectors. It died and luckily would not restart.
That was around two weeks ago and I don’t have the truck back. Waiting for parts again.
Losing confidence in the truck, although, the last issue was a clear mistake made by the mechanic.
As of today, this 11000 mile truck has been down 2 months.
Another issue in the near future, and I might give up on it.
The new GM Diesels look pretty solid.

Well hopefully I do not have the same problems as you do but I have to comment on GM Diesel. I almost went that direction but Luckly the salesperson said the wrong thing to me, and I ran. Said nothing wrong about the GM Diesel just this person comments that we would be back to buy. But I have also heard from a known source that they were having problems with their GMC Diesel and has been down for a month also. So, I guess in the end one never knows if you are going to get a good one or not. All manufacturers have their problems right form the get go.

 

[speeder37]

Well hopefully I do not have the same problems as you do but I have to comment on GM Diesel. I almost went that direction but Luckly the salesperson said the wrong thing to me, and I ran. Said nothing wrong about the GM Diesel just this person comments that we would be back to buy. But I have also heard from a known source that they were having problems with their GMC Diesel and has been down for a month also. So, I guess in the end one never knows if you are going to get a good one or not. All manufacturers have their problems right form the get go.

You are correct. You never know what you get. I have a Rebel Diesel and I believe the Ram is head and shoulders better than the competition.
I should have it back this week and hopefully it goes along happily ever after and a improved fuel pump is soon available.
if all is well in a couple of months, a GDE tune would be in order.

 

[SoDak]

I bought a used 2020 ED Rebel 75k miles. Truck is in great shape.. I had the truck 6 days then HPFP failed. I am looking at 6 or more months before I have my truck back. In the early stages, but I hope for some kind of reimbursement and free extended warranty from them.

 

[97hmcs]

I bought a used 2020 ED Rebel 75k miles. Truck is in great shape.. I had the truck 6 days then HPFP failed. I am looking at 6 or more months before I have my truck back. In the early stages, but I hope for some kind of reimbursement and free extended warranty from them.

Wow that sucks. Seems like you should get a loaner.

 

[ncskibum]

I bought a used 2020 ED Rebel 75k miles. Truck is in great shape.. I had the truck 6 days then HPFP failed. I am looking at 6 or more months before I have my truck back. In the early stages, but I hope for some kind of reimbursement and free extended warranty from them.

Check the lemon laws in your state. I know it's not a new truck but with only 6 days of ownership before failing, you might have an out.

 

[SlowRoller]

I bought a used 2020 ED Rebel 75k miles. Truck is in great shape.. I had the truck 6 days then HPFP failed. I am looking at 6 or more months before I have my truck back. In the early stages, but I hope for some kind of reimbursement and free extended warranty from them.

What is the dealer's excuse for not installing the original version of the pump until getting the new version in?