I was thinking the same thing when this first came up, but then I found a Racor diagram and it showed the pump before the filter,
Now, I just did the same search, and found this, https://www.parker.com/literature/Racor/Tech_Install/15335_500MA <https://www.parker.com/literature/Racor/Tech_Install/15335_500MA&MAM_Marine_Turbines.pdf> &MAM_Marine_Turbines.pdf where it shows both, only with the caveat that the pump will emulsify the water into the fuel, and won’t spin out in the turbine – so they recommend it be on the suction side. I have the double 500, and it is on the suction side. Bill Coleman Entrada, Erie, PA From: David Knecht via CnC-List [mailto:cnc-list@cnc-list.com] Sent: Monday, September 27, 2021 3:19 PM To: CnC CnC discussion list Cc: David Knecht Subject: Stus-List Re: Fuel pump Hi Josh- I was looking at new Racor filter units and this was the information Defender provides. That sounds like the reverse of your recommendation? Turbine Series filter assemblies are designed to be installed on the vacuum side of the fuel transfer pump for best efficiency and protect precision engine components from dirt, rust, algae, asphaltines, varnishes, and especially water, which is prevalent in engine fuels. Racor’s system diagram is the same: fuel tank, Racor, Lift pump, secondary filter, engine S/V Aries 1990 C&C 34+ New London, CT On Sep 23, 2021, at 10:37 AM, Josh Muckley via CnC-List <cnc-list@cnc-list.com> wrote: I'm late to this discussion, sorry. If you have an electric fuel pump it should be connected before the racor. Suck directly from the tank and as close to the tank as possible, discharge into the racor. This eliminates the chance of a vacuum leak in the racor or anywhere else downstream of the pump since down stream is pressurized. Our era of boats were typically equipped with 200FG model racors. Glass/plastic or metal bowl for diesel. Metal bowl only for gasoline. I found venting to be a PIA. I've shared this before but here is a video that includes a mod for easier venting. This mod requires drilling and tapping the racor head. https://youtu.be/H-GI38vE4hQ Josh Muckley S/V Sea Hawk 1989 C&C 37+ Solomons, MD
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