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Fuel Polishing again.
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. Mark the pressure gauge with new pump and a clean filter, second mark corresponds to max filter pressure drop. If you really want more assurance that it's running OK, either add a pressure gauge on the suction side of the pump to prove the inlet strainer is not blocked, or a delivery side sample point you can use for a flowrate check. I'd go for the flowrate check, and make the inlet strainer as coarse as possible - it's a strainer to protect the pump, not a filter .... David "Rick" wrote in message hlink.net... Steven Shelikoff wrote: IOW, even if the pump is past the filter drawing fuel through it, the filter is still in "pressure" mode because it's really the atmospheric pressure pushing fuel through the filter. The difference is that if the pump suction pulls water and fuel directly from the tank it will do an excellent job of mixing it up to form an emulsion that will not filter out very effectively. The path should be, a basket strainer to catch the chunks, a separarator/filter to eliminate the bulk of the water and the smaller suspended particles, the pump, then the finer stages of filtration. This is all assuming you don't have access to a centrifuge which is really the best way to handle the process. Rick |
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