On my current setup Iam switching the returns, looping the veg. side and returning the stock side back to the factory tank but, Iam getting wvo in my diesel tank. So either install a delay timer for the return swiching valve or just loop the return all together and use no valve at all.I dont see why I cant do this.

if you wanna go this route then you should leave the valve in place so that you can purge air out of the system, then put your loop T after the inlet selecter valve as close to the injection pump as possible. you will have to have a longer shut down period on diesel because you will be flushing out the pump and return lines. takes about 5 to 10 mins depending on your setup. i would just use a 30 second delay on switching. i have ran both systems and i feel that it is well worth it to have two valves.

-jared