I know NAPA sells a six volt electric fuel pump but you'd also need to add a pressure regulator if you go the electric route. Originally the Henry J 6 cylinder used a mechanical unit, a Carter M8095 for the dual action one and I don't recall the number for the single action unit. The mechanical pumps work fine, I've never had one fail on me yet in 40+ years of messing with Henry Js. Ron Meditz and Cherry Hill Kaiser-Frazer parts, which I think is now
www.kaiserwillys.com , used to sell an AC replacement which worked fine. Another source for the mechanical ones is... on my other computer, I'll post it later but there is a place that rebuilds them and sells kits for them. I'll post it later when I find the site.