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Message: [QUOTE="LReiff, post: 422296, member: 3106"] Sumps vs draw tube should not be the debate. Pump cavitation is the biggest killer of any pump motor whether it pumps, water, fuel or ****. The biggest problem I see is port size feeding the pump. 1/2" hose is closer to 3/8" through the fittings, 5/8" is near 1/2" through the fittings. On my daily driver I have a draw tube made of 3/4" black steel pipe with 3/4" fittings and hose feeding 2 parallel water separators (fleetguard fs1000) and after the pump (Raptor 150) I have 1, two micron filter. I can empty the fuel tank as low as any sump will take it without loss of suction, also I have never burnt up a pump motor with this arrangement. Previously, with the very same draw tube and hose (it took a custom fitting, -12 jic to 3/8" male pipe) I burned up two DF-165s and one DF-200. The fitting at the pump body was custom due to some external machining to make it fit beside the regulator assembly and some internal machining to improve flow characteristics. The setup I have now uses 3/4" split into two 5/8" lines, one to each water sep, then back together again, all in 5/8" to feed the pump. After the pump I have all 1/2" line. Line size on the pressure side is not critical but on the suction side its life or death. Low fuel velocity on the suction side reduces entrained air. [/QUOTE]

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