i honestly see zero benefits to using the bmw cp3, out of curiosity why would you prefer this setup? eliminating the factory lift/aux pump cleans up the engine bay and i dont think using the bmw cp3 makes anything easier per say.
Because I have access to a brand new BMW CP3, with a discount. The WP CP3 are not being offered as brand new anymore and I want a new CP3, not a reman.
Then buy cp3 pump from fleabay (eBay) new and buy WP cp3 mounting kit and you are golden.
Jinx! I was going to say the very same thing. I dislike BMW CP3 just because it requires aux pump and its more cluttering on the engine bay. One vendor whom I am not going to name, said “BMW CP3 is “overkill” compared to the gear driven CP3 then I replied saying then why do BMW CP3 require aux pump if its overkill? It dont make sense at all. From my POV, requiring pump means the BMW CP3 is weaker. Period.
Sure, I could do that if I know the part number of the exact same CP3 pump being offered in the WP/UD kit. I'd prefer to buy the pump through the local parts suppliers. I need CP3 and other parts to be accessible locally to minimize the downtime. I don't have a second vehicle that I can drive and I'm allowed maybe 2 days max of downtime due to the nature of my job.
For future reference, just in case the image goes down - P/N w/ Aux pump is 9637317380Heres the tag that was on my pump, one of the original 2micron kits
I really don't want to make it a FMW vs WP CP3 debate post.
Yes,
fair enough. not trying to debate either, merely curious but i now understand your appeal.
No more issues. I just got a foot of 5/16 fuel line and replaced the line entirely. I've got about 1500 miles on it now.
You -can- delete it if you want. Everything still works exactly the same and the CP3 does not require it. Much cleaner looking engine bay without it there as well.
Interesting you posted this, I just had this issue. Had to reinstall the aux pump to get the air flushed out after a fuel filter change.. I’ll be reinstalling it
What cp3 pump kit do you have?
R70 kit from Xman, so White bread adapter kit plus a black CP3 pump. It has the low pressure gear drive on the back. It’s worked fine with just the lift pump this entire time. This was the first time I’d changed the fuel filter, and it absolutely would not cycle the air out or even move fuel through the rail without the aux pump installed.
I flow from the lift pump seemed slow and steady rather than blasting out.. I took the line off at the high pressure pump and checked there.
Everything is fine after using the aux pump to purge the air out. Hoses weren’t swapped, however during troubleshooting I took the return and pump feed lines off the filter housing to see how much flow difference there was. Interestingly, both the pump feed and rail return connections on the filter housing flowed out the same volume and at the same time.. so I’d assume with equal pressure on both sides of the CP3 no air could be purged. Once the aux pump was installed, it overcame the return pressure and push the air out..
You know I’m also considering capping the two returns on the oem housing and routing the rail and tank return together. So the risk of the oem filter feeding contaminated return fuel back into the pump is gone. (If the CP3 did come apart)… it’ll also get rid of my air purging problem post filter change
So here’s what I ended up with. No risk of contaminated return being mixed with unfiltered fuel feed. Only risk now is the lift pump and tank which I can accept. May setup a return filter at some point but not too concerned..
Hmm! Never thought of that. Will check with 2micron of your idea lol I personally like it.So here’s what I ended up with. No risk of contaminated return being mixed with unfiltered fuel feed. Only risk now is the lift pump and tank which I can accept. May setup a return filter at some point but not too concerned..
spoke to 2micron, he said why not? as long as I am in the warm climate (Florida). good to go. I'm unsure where you are residing in, @Timma100So here’s what I ended up with. No risk of contaminated return being mixed with unfiltered fuel feed. Only risk now is the lift pump and tank which I can accept. May setup a return filter at some point but not too concerned..
