You have to remember that the modern filter funnels don't just allow water to "drop out". The filters actually have a hydrophobic coating (green on mine) which prevents water from passing based on water's surface tension. 2 different demonstrations can show this.
The first is where water is used to fill the funnel halfway up the filter - no water exits. Then diesel is added to the funnel - diesel flows freely until fuel can be seen on the surface of the water. The second is where perfectly measured equal portions (about a pint) of water and diesel are mixed by shaking in a small container. This mixture is the added to the funnel and low and behold nothing but pure diesel fuel exits the funnel, again leaving behind water with no detectable diesel in the funnel. It's actually a pretty cool demonstration which I've seen at the boat shows. You might be able to find a similar demo on YouTube. Something that the instructions mention is testing the filters from time to time by pouring water in to ensure that it doesn't leak out. The instructions also suggest that you can do that "test" prior to each use and then leave that water in while filling with diesel. Once done adding diesel, you'll be left with only water - that which you added plus any that was removed from the fuel. Since the filter has the hydrophobic coating you need to be careful not to damage the coating while cleaning/drying the funnel. Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD On Sep 8, 2017 12:07 PM, "Dennis C. via CnC-List" <cnc-list@cnc-list.com> wrote: > Touche' came with a decent fuel funnel with fine screen in the bottom. I > think it's an old EZ-John funnel. Used it for years but it is very slow. > Not fun holding a 5 gallon diesel can for 10 minutes while the fuel drains > so slow. > > I bought one of the Mr. Funnel F3 fuel funnels. While it passes the > diesel much quicker, you're left with a couple ounces of diesel in the > funnel. The design is such that any water would be left in this small > residual. > > It's a pain to deal with that couple ounces left in the funnel's sump. I > usually carefully remove the funnel, put the old funnel in the fill fitting > and pour it in there. Now I'm left with two wet funnels. > > I've searched the Internet for a fuel filter funnel that doesn't have the > water trapping sump design. I see Mr. Funnel, Racor and others but they > all have the water trapping sump. > > I'm about to mix up a batch of epoxy and fill the sump up to the bottom of > the filter screen but that seems like an aggressive solution. I have a > Racor 500 to trap water so I'm not overly concerned about removing water. > > Any slick ideas out there? > > Dennis C. > Touche' 35-1 #83 > Mandeville, LA > > _______________________________________________ > > This list is supported by the generous donations of our members. If you > wish to make a contribution to offset our costs, please go to: > https://www.paypal.me/stumurray > > All Contributions are greatly appreciated! > >
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