Two stage, double performing: There's two cylinders, which operate alternately, Just about every pressurising fuel whilst one other is refilling, nevertheless the second stage features a smaller bore and is loaded by the fuel pressurised by the very first stage, and it pressurises the fuel even further. The stages operate http://storage-containers89998.total-blog.com/the-best-side-of-motorhome-and-caravan-trader-32577006