We have been using the West Marine
funnel for about 10 years now. As mentioned on a previous post it is very
slow. I modified it by filling the reservoir in the bottom with epoxy
. The first one I tested in the kitchen sink by filling with water. Not a drop came through! However after several years of use I tried showing someone this amazing trick and to my surprise the water drained right through. I relluctantly purchased another under the condition if it passed water through I would bring it back. I now test several times a year and find out these will last about 2-3 seasons.
We were burned once about 15 years ago and really got a bad batch of gunk in our tank. We played heck for a whole season trying to clean this up and vowed then I will filter every drop between filler nozzle and the filler cap. In the last 10 years we have had 3 issues that was caught during filling. Many fuel docks can reduce the pressure if asked. Remember their main object is to fill that 600 gal tank in 10 minuites for that large motor