They are compatible and warranted with ethanol based fuels and diesel, and are very quiet.No pre pump is required. These pumps are twin stage, meaning they suck and push. They will lift fuel 500mm.Made in Poland, they are extremely reliable (Sold over 500 over the years and have never seen a faulty one), and feature an integratedone way valve. They flow 300lph@5bar, and 360lph@3bar;approx 50lph more than a bosch 044.