Fuel Filter Micron Rating Chart

Fuel system pre filter before the pump.

Fuel filter micron rating chart. 40 to 1270 micron. In accordance with the world wide fuel charter cummins and other engine manufacturers specify a minimum fuel cleanliness level of 181613 with a maximum water content of 200 parts per million. Crankshaft journals are often finish polished using 23 micron abrasives. It doesnt sound as if youve done any damage to the pumps and the pressure drop across your filter sounds normal although i wouldnt wait until it reaches 15 inches of mercury before changing the elements.

Engine oil main filter. For example when comparing two filters that are both rated at 5 micron if filter a has an efficiency of 99 it will remove 99 of contaminant 5 micron and larger from the fluid. Engine oil pre filter inspection filter. For example a filter rated for twenty 20 microns means that the filter will capture and contain all particles in the fluid that are 20 microns and larger in diameter.

For example when comparing two filters that are both rated at 5 micron if filter a has an efficiency of 99 it will remove 99 of contaminant 5 micron and larger from the fluid. If filter b has an efficiency of 50 it will only remove 50 or half of the same contaminant. Two filters that both claim to capture the same size particles or have the same micron rating may provide vastly different performance results. A 7 micron fuel filter with 987 efficiency rating removes 987 of the particles at or above the 7 micron size.

25 to 400 micron. Fluid filters can have a micron rating which expresses the filters ability to remove contaminants based on the size of the particles. 8 to 40 micron.