i have a theroy on this, i think teh sand is forced into teh filter from the top of the draing nut if it is not cleaned when a sample is taken. when i cut my filter open to see if it was blocked (there was a small amount of sand in there) the nut that the drain plug goes into is not sealed so any debris on top of teh drain plug is screwed into the filter, this then gets washed out of the small neck from fuel flowing past the ancour nut, so next time a sample is taken there is sand or grit in it.
not a great design, in my opinion.
ian



				
				
				
					
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