not sure where to put this but im wanting to do a custom fuel system when i build my truck next year. my first question is how do you size AN fittings? right now ive got a hellman sump adII and im gonna be getting a dozer's diesel regulated return. my second question is would push loc hose work for what im wanting to do?third is would i need a custom return line from the rr to the tank or would the stock line work?