Honestly I don’t know enough about it to probably explain it right but many guys have a stand alone pump and fuel cell for their nitrous system. Especially guys running alcohol as many spray race fuel for their nitrous side. When I bought my Sledgehammer 700 horsepower system I bought a pressure kit because Steve gives you nitrous and fuel pills and a tuning spreadsheet to get you started. X amount of pressure on the nitrous side at X amount of fuel pressure. With a big pump like I’m using on my heads up car it would have fuel going to a fuel log then regulated after that for the engine and nitrous system. Like I said I’ve never used it or finished plumbing my system so don’t hold that as Gospel.