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Those little on-engine fuel pumps can exert a LOT of suction. The bottom of my fuel tank is several feet below the pump and it never had problems sucking the tank dry :)

That said the suggestion for an electrical pump between the tank and the filters has a lot of merit. It also makes bleeding the filters after changing the element very easy.
 

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After digging through a not very well designed Racor Web site, I found a spec for the 500 filter of 15PSI pressure. Since electric fuel pumps are pretty low pressure (I seem to remember 5PSI) There should be no problem putting it in front of the filter.

That said these are called "Turbine" filters and there might be some efficiency problems. There was another statement on the web site that they were designed for use under suction.
 
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