This pump was used on 650 taps. It was on a vacuum tank so I used vacuum regulators to keep the vacuum at 19". If you go higher, you will need a releaser and also need to open up the oil flow to the bearings or bushings. This pump had new vanes in 2015 and was retired in 2017, when I replaced it with a Alamo 75. I ran it off a 6.5 hP Honda on a 4.5 gal fuel tank.