Hi all, sorry to ask but I have been doing a lot of reading on this topic and am now totally confused. I am installing a catch can on an FGX XR6T. It’s a SAAS catch can that does not vent to atmosphere. I am only installing it on the PCV side for now and possibly another can for the other vent later. This is my proposed routing: Keeping the stock PCV valve in place; running a line from the PCV valve to the catch can inlet and then the outlet line from the can to the intake manifold (stock position). Do I need a one way check valve in the outlet hose? If so I am assuming the directional arrow needs to point to the intake manifold so I don’t pressurise the catch can. I have a factory intake with crossover. Any help greatly appreciated. 

Yes to the check valve. The way you've described it is the way I've run mine too and works perfectly. Check valve circled.

Thanks for the info and the pic. Just checking as it’s a little hard to see (follow the hoses). Your PCV goes to the can inlet and your outlet from the can goes to the inlet on the manifold. Your check valve is on the outlet to the manifold ( as it is vey close to the PCV-  just double checking). In the stock set up - the hose that goes from the PCV to the inlet manifold has what looks like a one way valve already on the line. Do you know if that is the case? Thanks again.

Yep that's how ive routed it. I left that stock valve in place and ran my own metal check valve on the outlet side as well. 

Job done. Thanks for your help. I have made it totally reversible should the need arise. No check engine lights so far. Cheers

Tidy mate [emoji106]

Anyone know where does the original PCV hose run to and can it be removed completely or terminated?

I can't find anything on the interwebs about this side of the PCV system, everything is redirecting to the catch can and that's it.

Trust me you don't want to remove/disable the PCV system. The stock line is connected to the rocker cover and dumps the oil vapour back into your intake to either recondense there into a liquid or be combusted in the next engine cycle.

On 13/07/2021 at 8:49 PM, violetpop said:

Yes to the check valve. The way you've described it is the way I've run mine too and works perfectly. Check valve circled.

What check valve have people used? Was wondering why everything has been getting oily, my valve had failed and was sending boost up the wrong hole!

You don't need a check valve. The routing goes from rocker cover, to catch can, to turbo intake. At no point should there be boost present in the catch can system. You use a one way valve for the brake booster from the intake manifold, and the stock one does the job just fine.