Should I install the provided metal standpipe in my fuel tank or is it ok to use the factory AUX fuel port on my van?

Standpipe guarantees the best performance. However, we do have a lot of customers using the auxiliary fuel port with no issues. I would recommend installing the stand pipe if you know that you are going to spend extensive time at 8000ft+. Otherwise, you can try the auxiliary fuel port first, and if you experience trouble at high elevation or constant losing prime, then install the standpipe.