This is very much the way I have done it in the past and rarely do I get more than a little fuel on my fingers or on the ground. However I usually do drain the filters into a clear soft drink cup
with the drain in the WIF sensor, as I have always been looking for the water that I thought was setting off the WIF sensor.
with the drain in the WIF sensor, as I have always been looking for the water that I thought was setting off the WIF sensor.