I bought a box of Detroit filters (To be exact Detroit Diesel fuel filter/twist and drain with a part number 23535985. I took a chance and bought them for around $20 and they are still in the shrink wrap.
My question is if they are primary or secondary filters. I have been searching that number and only found one site with very little information. It was a filter cross reference website and they described it as Primary.
Any thoughts or knowledge given is greatly appreciated and I thank you in advance. W
The threads on them should tell you, I forget which way but one is larger than the other if my memory serves me right.
Wayne that is a primary fuel/water separator filter should have a petcock on the bottom to drain water,same as a Napa 3418 filter
good luck