CP3 fuel pump upgrade thread

[McGuirk]

IMG_8908.jpeg

• Bryan111
• Feb 9, 2025

It’s dark outside but it’s the kit from darkside, I got it installed by a shop and I actually ask that question, if they were going to remove that pump but they told me they wouldn’t recommend it. Should I take it off???

The darkside kit pumps have the built in lift pump so the aux pump should be removed. If it were the BMW cp3 pump it would need the aux fuel pump in place because those cp3 pumps don't have the built in lift pump.

 

[lemoncurd]

IMG_8908.jpeg

• Bryan111
• Feb 9, 2025

It’s dark outside but it’s the kit from darkside, I got it installed by a shop and I actually ask that question, if they were going to remove that pump but they told me they wouldn’t recommend it. Should I take it off???

you have the typical CP3 used on these swaps. meaning it has a gear driven LPFP on the back.

remove the engine bay auxiliary fuel pump.

the CP3 with the built in gear pump only requires 5-10psi of head/feed pressure. that engine bay auxiliary pump provides about 100psi which is required for HPFP's that lack the built in LPFP (CP4, CP3 from BMW, etc)

 

[Bryan111]

The darkside kit pumps have the built in lift pump so the aux pump should be removed. If it were the BMW cp3 pump it would need the aux fuel pump in place because those cp3 pumps don't have the built in lift pump.

Where did you get your filter adapter from I tried nicktane webside but they don’t have it

 

[Bryan111]

you have the typical CP3 used on these swaps. meaning it has a gear driven LPFP on the back.

remove the engine bay auxiliary fuel pump.

the CP3 with the built in gear pump only requires 5-10psi of head/feed pressure. that engine bay auxiliary pump provides about 100psi which is required for HPFP's that lack the built in LPFP (CP4, CP3 from BMW, etc)

Great, thanks for all the info I would remove the auxiliary pump and try to do the filter adapter at the same time. It should be the same process to prime the system right? I use obd11

 

[McGuirk]

Where did you get your filter adapter from I tried nicktane webside but they don’t have it

It isn't sold anymore. If you search "cat 0750 filter adapter" there are quite a few different options. You may have to use a creative method to make it all come together but it can be done. Amazon sells a cheap cat filter adapter too.

 

[lemoncurd]

Great, thanks for all the info I would remove the auxiliary pump and try to do the filter adapter at the same time. It should be the same process to prime the system right? I use obd11

yeah same process to prime it. there is an intank lift pump still which will circulate fuel through the filter and CP3 inlet

 

[Bryan111]

yeah same process to prime it. there is an intank lift pump still which will circulate fuel through the filter and CP3 inlet

Ok so here is an update of my auxiliary pump removal and cat filter install, I couldn’t find a filter base that would bolt to any part of the engine bay, all the ones I found where meant to hold the actual filter with hose clamps instead of the base which deceives the idea of the screw in filter. I saw a YouTube video of ( josh’s jetta’s) and did the same thing, I went with just a generic filter base from Amazon, I cut the top screw hole of it to make it flat and then painted black, enlarged the 2 square holes on the metal bracket on top of the headlight and bolted the filter housing to it, for the fuel lines I went a different route from the video I remade my fuel lines so I could run the line from the tank to the filter through the back of the coolant reservoir then made a short line from filter to cp3 pump and also remade the return line to the tank and held it to the coolant line with some 6an dual line clamps for a cleaner look to finish I did some trimming to the engine cover to clear the line from filter to cp3 pump. Everything seems to be working fine so far and I spent less than $100 in all the parts, now there is enough space in there to unscrew your filter and install a new one with one hand in no time.
Here is a few pictures of the installation

IMG_8998.jpeg

• Bryan111
• Mar 4, 2025

IMG_9014.jpeg

• Bryan111
• Mar 4, 2025

IMG_9020.jpeg

• Bryan111
• Mar 4, 2025

IMG_9019.jpeg

• Bryan111
• Mar 4, 2025

IMG_9018.jpeg

• Bryan111
• Mar 4, 2025
• 2

IMG_8997.jpeg

• Bryan111
• Mar 4, 2025

IMG_8955.jpeg

• Bryan111
• Mar 4, 2025

IMG_8908.jpeg

• Bryan111
• Feb 9, 2025

 

[McGuirk]

Ok so here is an update of my auxiliary pump removal and cat filter install, I couldn’t find a filter base that would bolt to any part of the engine bay, all the ones I found where meant to hold the actual filter with hose clamps instead of the base which deceives the idea of the screw in filter. I saw a YouTube video of ( josh’s jetta’s) and did the same thing, I went with just a generic filter base from Amazon, I cut the top screw hole of it to make it flat and then painted black, enlarged the 2 square holes on the metal bracket on top of the headlight and bolted the filter housing to it, for the fuel lines I went a different route from the video I remade my fuel lines so I could run the line from the tank to the filter through the back of the coolant reservoir then made a short line from filter to cp3 pump and also remade the return line to the tank and held it to the coolant line with some 6an dual line clamps for a cleaner look to finish I did some trimming to the engine cover to clear the line from filter to cp3 pump. Everything seems to be working fine so far and I spent less than $100 in all the parts, now there is enough space in there to unscrew your filter and install a new one with one hand in no time.
Here is a few pictures of the installation

IMG_8998.jpeg

• Bryan111
• Mar 4, 2025

IMG_9014.jpeg

• Bryan111
• Mar 4, 2025

IMG_9020.jpeg

• Bryan111
• Mar 4, 2025

IMG_9019.jpeg

• Bryan111
• Mar 4, 2025

IMG_9018.jpeg

• Bryan111
• Mar 4, 2025
• 2

IMG_8997.jpeg

• Bryan111
• Mar 4, 2025

IMG_8955.jpeg

• Bryan111
• Mar 4, 2025

IMG_8908.jpeg

• Bryan111
• Feb 9, 2025

Looks great! Should be running nice now without the aux pump and the new line routing.

 

[lemoncurd]

honestly im thinking about swapping to a filter like that simply for the neater engine bay look

how is replacing that filter @Bryan111 ?

can you spin it out without removing the base mounted in the engine bay?

 

[Bryan111]

Yes sir, its a really tight squeeze but you can spin the filter and change it with out messing with the base, it took me longer to plug in my obd11, go to the app and prime the system than changing the filter
One thing I do recommend, no sure if it’s needed but this is just me from owning a 5.9 Cummins with a Fass fuel system on it.
I left the filter a little loose and started priming the system, you can hear all the air coming out, once you see some fuel dripping out of it you can finish tightening the filter, that is the process Fass recommens to change their filters
I did it this way and the car started right up compared to the oem filter that no matter how long I would lived the pumps running, it would always crack for a little while before starting

 

[ZippyNH]

Yes sir, its a really tight squeeze but you can spin the filter and change it with out messing with the base, it took me longer to plug in my obd11, go to the app and prime the system than changing the filter
One thing I do recommend, no sure if it’s needed but this is just me from owning a 5.9 Cummins with a Fass fuel system on it.
I left the filter a little loose and started priming the system, you can hear all the air coming out, once you see some fuel dripping out of it you can finish tightening the filter, that is the process Fass recommens to change their filters
I did it this way and the car started right up compared to the oem filter that no matter how long I would lived the pumps running, it would always crack for a little while before starting

Tip...if you are going to use that style filter, you can get a CLEAR holder that holds a slightly shorter filter that has a drain on it...makes it easier to monitor for moisture, color and you can drain a few drops of water that collects in it to extend the filter life.

 

[mikerob97]

Tip...if you are going to use that style filter, you can get a CLEAR holder that holds a slightly shorter filter that has a drain on it...makes it easier to monitor for moisture, color and you can drain a few drops of water that collects in it to extend the filter life.

Funny - my old Peugeot 504 diesel use to have a clear glass filter bowl with a manual priming pump on the top of the aluminum housing. And yes, a thumbscrew water drain at the bottom...

 

[calimustang]

Hey guys,

there has been a million posts about P0087 and now I know why, please check this part on your car and make sure you clean it really good. my JSW dont have that part anymore. my cp3 kit are 2micron designed kit, he knew what was coming.

FB post of P0087 issue low fuel rail pressure.png

forums.tdiclub.com

 

[McGuirk]

Hey guys,

there has been a million posts about P0087 and now I know why, please check this part on your car and make sure you clean it really good. my JSW dont have that part anymore. my cp3 kit are 2micron designed kit, he knew what was coming.

FB post of P0087 issue low fuel rail pressure.png

forums.tdiclub.com

Funny thing on my A3 i replaced that screen housing during install because I broke the old one. Car still had trouble with the p0087. Only thing that has fixed it is the fuel line routing. Very interesting though.

 

[DieselDude25]

Has anyone done a CP3 swap on a 2013 CKRA? Info seems limited on the ckra.
Trying to do this to a fully stock engine with emissions without a tune hopefully.
Looking into doing it to mine and I'm torn between the Cascade German kit or the Whitbread kit.
WB uses a cp3 with a gear pump on the case and on the other engines requires the aux pump to be removed
CG uses a BMW R70 CP3 without the gear pump
My CKRA DOES NOT have an under hood aux pump just the in tank sending unit pump so I'm wondering if ill have a supply issue to a non gear pump cp3
Any info would be helpful!

 

[DieselDude25]

Got my answer from Cascade German:
(quoted from email)
"The CKRA specifically does NOT have an intermediate fuel pump anyway. Its in-tank pump puts out a lot more pressure than the CBEA/CJAA pump does--7 PSI vs. 65-68 PSI.... But once again, no modification of that side of the system is required.

Some of the kits that use a VW CP3 require removal of the intermediate pump because those CP3s have a built-in lower pressure vane pump that does the job of pumping the pressure higher. Usually, those kits also require some special tuning to get to work correctly with the stock software. *Usually* the R70 kit does not. However, if your car is already tuned, there is an increased chance that you will have to have it re-tuned."

Gonna go ahead and order the kit from them, I'll post an update when I get it and when I start the install.