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Fuel Polishing again.
David Flew wrote:
Seems to me if the filters are clean and if there is a screen or coarse filter to protect the pump the differences between having the fine filter before or after the pump are probably academic. I don't know the pump details or characteristics, but pumps need to have their inlet pressure above some minimum figure - net positive suction head - or they don't work. And it's much easier to find leaks of fuel out of a pipe than air leaks into it. If it leaks fuel it's still working, if it leaks air in it probably isn't. So I'd think more about troubleshooting the system when there has been some bad fuel and the filter pressure drop is getting high --- I'd like to see the pump protected against things which might damage it, then a pressure gauge , then the finest filters. It might not be the best arrangement in terms of emulsifying water, but I'll bet it's the easiest one to diagnose. Personally, I'd rather diagnose a leak in a vacuum system that stops the engine due to air getting in the system than one in a pressure system that keeps running but pumps fuel into the bilge until your tanks are dry and then stops the engine. But that's just me. Steve |
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