DB, I installed a 4 brl Sniper EFI on my BIL's 57'. The fuel pump on it was extremely loud(loader than the flowmaster mufflers) and had an issue with keeping up with the engine under load. I found that the return line was restricting the flow and causing the pump to cavitate. I relocated the return line to the top of the tank, actually in the filler neck and remounted the lines (the tank has no access point to attach a return line). Since that point I have had no issues and the pump is quieted down considerably.

~ Craig
1958 Viking 4400
"The Book of Thor"
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1960 Chevrolet C10
"A Family Heirloom"
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'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)

If you don't like driving yourTruck, you won't drive yourTruck..| Living life in the SLOW lane