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#5: 08-19-2010, 06:39 AM
Title: Too Big to Fail
Rank: Donating Member
Location: Naperville, IL
Car: 05 Legacy GT/15 Chevy SS Sedan
Posts: 13,779
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They do it to reduce the heating of the fuel and evaporative emissions. In a nutshell, the pump will run in 3 modes: 1/3 at idle or no load, 2/3 at low load and 100% at high load. There is ABSOLUTELY NO REASON AND NO BENEFIT to running the pump 100% at all times.