HPFP aftermarket fix?

[Rusty PW]

Seriously??!!! Does the gear need to be aligned with anything or is it just a mechanical pump? It's not actually timed with cylinder 1?

With the old mechanical pump and injectors each feeding off the pump. It had to be timed. With the new common rail, I don't think so.

Sponsored

 

[Lost1wing]

I am contemplating buying a leftover 2023 Rubicon Ecodiesel but with all the pump failures I am hesitant. I did find a company that makes a pump for the ram and states it will work for 2014-2022 ecodiesels. I emailed them to see if it is comparable for gladiators and waiting to hear. The pictures make it look compatable. If it does fit, I think I will pull the trigger on it. Here is their description post your thoughts:

2014-2024 RAM 1500 3.0L ECODIESEL CPX FUEL PUMP

The CP4 pump Bosch should have built, the CPX.
• Pinned lifter buckets to prevent rotation and stop failures. Even during a gel.
• New feed port, preventing any contaminated crankcase debris from entering the plungers and barrels. (Built in disaster prevention kit)
• Direct drop-in replacement, no aftermarket fuel lines or components needed.
• No additional labor or modifications to install.
• 24 Month no questions asked replacement warranty.

And just to point out, the whole “US diesel fuel doesn’t have enough lubricity for the CP4.” That’s a lie. I have disassembled, measured and under microscope, inspected pumps with over 500k miles with essentially zero wear.

The flaw was nothing to stop the roller lifter from rotating in a vacuum event. (Gel, filter change, low pressure feed issue.) This is why the LML Duramax pumps drop like flies. There is no lift pump to keep positive pressure on the plungers and barrels.
This allows a slop, or gap between the cam and the lifter roller. Which allows it to turn. Similar to a roller cam in a engine. When there is no lifter guide or link bar. The lifter rotates, destroying the cam and lifters and filling the engine with hardened metal filings. These filings, are what fills your fuel rails and injectors with debris, ruining them.
All 2011 - 2024 RCD CPX CP4 pumps are modified internally in a 5 AXIS CNC to return fuel to the tank. This prevents debris from entering the injector in the instance of a failure. "DISASTER KITS" ARE NOT NEEDED!

https://rcdperf.com/products/2014-2019-ram-1500-3-0l-ecodiesel-cpx-fuel-pump?variant=40346562134114

I still have my cp4 in my Duramax. I'm currently at 165k which is relatively a low mileage engine. Low lubrication, like you said may not be the reason for the cp4 failures. I also don't think the lack of a pressure pump to supply fuel is either.

I think it is technically, a lack of lubrication, but not because of USA fuels. I think it comes from running the pump dry. This happens during a filter change and not pressurizing the filter housing enough or incorrectly , loss of vacuum do to a leak, or just running out of fuel.

This is where having the lift pump comes in handy. At least you will see a leak.

The pump is still a bad design. Any pump that disintegrates and contaminates everything downstream causing thousands of dollars in damage is a poor design.

Or is it? It forces people to buy a new truck or spend the thousands to get the failed pump going again.

I have never run mine out of fuel nor have I let anyone replace my fuel filter. I have used oem filters and Amsoil filters only. You may not get a straight answer from someone who had a CP4 fail on them. I would bet they have either ran out of fuel once or twice or had trouble keeping their pump primed.

 

[Jrgunn5150]

Seriously??!!! Does the gear need to be aligned with anything or is it just a mechanical pump? It's not actually timed with cylinder 1?
So just a bit more technical than an old Chevy 350 mechanical pump

Gear has a keyway, pump has slots for timing, but wherever I put mine, it worked, I'm sure the PCM just offsets as needed.

 

[Jrgunn5150]

Or is it? It forces people to buy a new truck or spend the thousands to get the failed pump going again.

My pump was like 600 bucks, at 389,000 miles, seemed fair.

 

[Lost1wing]

If your pump grenaded, it didn't cost $600 to repaor the fuel system. If you preemptively relaced the pump before failure, $600 is a great price for just the pump. Most people here are not going to replace their own pump. $$$$

 

[Jrgunn5150]

If your pump grenaded, it didn't cost $600 to repaor the fuel system. If you preemptively relaced the pump before failure, $600 is a great price for just the pump. Most people here are not going to replace their own pump. $$$$

My pump grenaded.

I put a 600 reman pump on in the parking lot, and drove another 60,000 miles in that truck.

Obviously, that can't possibly work, and the internet said, and a bunch of people reading things on the internet and repeating them know better though.

 

[Lost1wing]

I don't see how a pump that grenaded didn't dump metal particles downstream to find the injectors. Unless, your pump didn't actually grenade but just failed? Good for you!

 

[Stan H]

I still have my cp4 in my Duramax. I'm currently at 165k which is relatively a low mileage engine. Low lubrication, like you said may not be the reason for the cp4 failures. I also don't think the lack of a pressure pump to supply fuel is either.

I think it is technically, a lack of lubrication, but not because of USA fuels. I think it comes from running the pump dry. This happens during a filter change and not pressurizing the filter housing enough or incorrectly , loss of vacuum do to a leak, or just running out of fuel.

This is where having the lift pump comes in handy. At least you will see a leak.

The pump is still a bad design. Any pump that disintegrates and contaminates everything downstream causing thousands of dollars in damage is a poor design.

Or is it? It forces people to buy a new truck or spend the thousands to get the failed pump going again.

I have never run mine out of fuel nor have I let anyone replace my fuel filter. I have used oem filters and Amsoil filters only. You may not get a straight answer from someone who had a CP4 fail on them. I would bet they have either ran out of fuel once or twice or had trouble keeping their pump primed.

Planned obsolescence is the name of the game.

 

[Mouse]

My JT is still running great after a week of several hundred miles. I've had a couple folks interested in possibly having me change out their pump (still deciding whether to do it themselves or not)

Sponsored