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Message: [QUOTE="IdahoF350, post: 1107133, member: 2989"] When I build a fuel system for a road racing car I run a central sump, and sometimes foam in the cell. For drag racing the sump is at the rear of the tank, and foam is not beneficial. I've seen the various sumps like the Hellmans, they are fine I guess, but I designed my own if I was ever going to go down that road back when I had my 6.0L. It's a little different than anything else in the market, actually traps fuel at the pickup, and would allow you to drain the tank of all but a couple quarts of fuel. But ultimately, yes, pulling the fuel up and out of the tank creates a vacuum on the inlet of the pump by itself. "In-Tank" fuel pickup inserts were all the rage for Mustangs from the mid '90s on, and I saw a higher than normal failure rate with everything from Holley "Blue" pumps to A1000s, especially when used with a pre-filter when using those inserts in a stock tank, and that is exactly how the stock Super Duty pickup is configured, so I don't want to replicate a known poor system configuration. Thanks for the input guys. Sent by my right thumb! [/QUOTE]

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