What mesh strainer is typically used before pumps in fuel systems?

In fuel systems, the mesh strainer placed before pumps is intended to filter out debris and particulates from the fuel to ensure that the pump operates smoothly and efficiently. A mesh strainer rated as 7 mesh is commonly used in this application. The reason for choosing a 7 mesh strainer is that it has openings that allow for adequate flow while still capturing larger contaminants that could potentially harm the pump or the fuel system.

The 7 mesh size strikes a balance between filtration and flow rate, allowing fuel to pass through without excessive restriction, which could create pressure issues or cavitation in the pump. Finer mesh sizes, such as 60 or 100, would capture smaller particles but could restrict fuel flow too much, leading to possible operational issues. On the other hand, a coarser mesh size like 5 might allow too many larger particulates to pass through, which would not adequately protect the pump and could lead to more frequent maintenance and repairs. Thus, the selection of the 7 mesh strainer before pumps ensures optimal performance and longevity of the fuel system.