[jims69camaro]

sorry, dude, it's old age. Â*once i see efi i lose my mind.

i would put a regulator on the n2o setup. it will solve your pressure fluctuation, and should keep the system at 7 lbs.

having a low pressure return plumbed into the high pressure return would be ok as long as there is a stop valve located in the low pressure line. you know, the kind of valve that lets it flow out but not back up the line.