Diesel Engines and pump ratings

I had this Engine burried away in my garage for years http://www.lombardini.com.pl/en/15-ld-400.html
I was working on this all day and finally got it started. It sounds sweet.

I know the formula for gas engines to figure out the size PW pump you can use to match the gas engine but does anyone know the formula when it comes to Diesel engines?

This Lombardini engine(Since taken over by Kohler) is a 10HP engine if that helps any.


[(gpm X psi) / 1450] X 1.3 = diesel hp.

Thanks Russ-- your the mechanical genius for sure;)