"According to Racor/Parker, th
"According to Racor/Parker, the best place to put a water seperator is before the pump, since the pump will tend to emulsify the water, making the seperator ineffective.
One could debate the effectiveness of a pressure side filter; For my boat, I keep things simple, and have no secondary filter. Unlike the Qjets, I don't believe that the carters even have a wire screen, although they may have moved it to right near the inlet valves.
In a more complex fuel valving installation, especially with a filter bypass valve and engines with injectors, the secondary filter has some merit. But, in my boat, the idea of two filters in series just means the second one has nothing to do.."