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: fuel lift pump & high idle switch somekevinguy 10-26-2003, 03:46 PM what does a fuel lift pump do and what is the reason for a high idle switch? i am guessing a fuel lift pump, lifts fuel but why and is a high idle switch for cold weather or something. I just got my first diesel and know nothing about them but this site is awsome. I am learning a lot. dmaxalliTech 10-26-2003, 09:17 PM the lift pump is needed to prevent outgassing on some filter setups. not needed on a stock truck The high idle wire is used to activate the PTO function in the pcm mainly for cold weather folks warming there trucks up. Eric craneman 10-28-2003, 06:14 AM Eric; Will the fast idle work on the 6 speed? Thanks Robert ISurvivedNMU 10-28-2003, 07:34 AM Also Eric, What setups is the lift pump needed on.... I have been running a racor r60 pre-oem with no trouble.... But should I have a lift pump also.... running the 90 hp juice..... Thanks Brian dmaxalliTech 10-28-2003, 09:25 AM crane, yes, the high idle will work. ISNMU, the Racor setup does not require a lift pump not does the juice. your fine. Eric | ||