There are a number of military suppliers around, Midwest Military in Minnesota comes to mind. I'm sure a 24 volt in tank fuel pump is going to be expensive. It's probably not over 5 lbs psi. An aftermarket pump with a regulator may be the way to go.
Fred


1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine