Water Pump Basics

Updated · 2026-07-19

The basics of the petrol water pumps used on site. Learn to start it, hook up the hoses and refuel, and you can run one on your own.

Pump

water-pump-working

Types

Water pumps are usually sized by their hose diameter in inches. They go up from 2-inch to 4-inch to 6-inch, and the bigger the number, the more water they can move. A small 2-inch pump is plenty for emptying a single pit, while sites that need large-scale dewatering hire 4-inch or 6-inch trailer pumps. With trailer pumps, the hoses for the inlet and outlet get just as thick.

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