Tunnelram and power Brakes?

I'm surprised there isn't more experimentation with "hydroboost" systems, or diesel vehicle vacuum pumps.

Years ago you could get dual-diaphragm fuel pumps to help out vacuum wipers. Why could you not "series wire" a mechanical fuel pump to your vacuum booster, and use only electric pump for your ----fuel?

I don't think it's the tunnel ram, by the way. "It's the cam"