The Truth About Modified CP3 Pumps

Today we will test a stock LBZ/LMM Duramax CP3 and then add modifications one at a time. We will demonstrate what each modification does to the flow rate of the pump, we will also show you the single most important part, that is not even offered in one very popular kit.

[@blackv7033]

Took 22 years, better late than never. Been waiting for someone to break these cp3s down.

[@SSfueled]

Great video! Thank you for putting more data-based knowledge into the market.

[@MotorsportDiesel]

My pleasure!

[@byronguidry9050]

Loved the information. Great video. You earned a Subscription.

[@MotorsportDiesel]

Welcome aboard!

[@alstewart525]

Great video. Thank you for putting it up

[@MotorsportDiesel]

Our pleasure!

[@keiferjanz3197]

Great video, extremely informative.

[@MotorsportDiesel]

Much appreciated!

[@m5scj123]

Excellent video! I have their injector test bench, another quality tool.Keep up the great work!

[@MotorsportDiesel]

Thank you!

[@pullingstars]

Good to see you on here again shane

[@MotorsportDiesel]

Thanks Jevon

[@Nathangies]

You need to make more videos always good stuff

[@MotorsportDiesel]

Thank you, I will

[@monsterram6617]

This kit is out of stock on your site. Is this going to change?

[@tinok.8149]

Woow!! Great video thank you!!!

[@MotorsportDiesel]

Glad you liked it!

[@rahulsoni6652]

Awesome video!🙏🏻 I have a question regarding the cascade valve, what modification did you do to it? Or do you sell these modified cascade valves? I'm in the process of further building my Mercedes diesel cdi which has the bosch CP3 pump.

[@MotorsportDiesel]

It truly is pump dependent, another consideration is the supply pump pressure to the CP3. Some of the R70 and R90 pumps have a suction valve return spring, so you must know what pressure it takes to open the suction valve, then examine the supply pump on the CP3 and the shaft, to see how high you can take the pressure. Too much and you generate metal from side loading the pumps spur gears, which ends up in the injectors. Generally around 6-7 bar or 90-105 psi is about all you want. I have gone to 120 psi before but it can be rough on the supply pump and the shaft flats. Depending on the pump in question, stock pressures can be 60-75 psi. We might make a video detailing the modifications process, and do before and after testing.