I also have twin DCOEs and OEM pump took hours to prime them - for whatever reason. I put Facet on originally to use as a primer pump, then thought 'what the hell" and removed mechanical pump. A few seconds of ticking, and starts right up. Now, I do carry the old set-up in the trip box, and it is a bit noisier than mechanical. Whether you need that for 38/38, I don't know.