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Message: [QUOTE="golfer, post: 19428, member: 266"] Matt..the higher the rpm..the more pressure required. that's why (we believe) none of the AirDog, FASS systems work worth a chit on the 7.3's or 6.0L's...since they are high VOLUME but low-ish PRESSURE. these systems work great on CR trucks, VP trucks, VE trucks...anything WITH an injection pump...since the injection pump merely has to remain PRIMED with fuel...and those style injectors don't "refill" (like a syringe) like a HEUI injector...they merely open to let fuel out..and close to block fuel flow through the nozzle...but they never are EMPTY of fuel... and doesn't have to refill each, individual injector...[I]between[/I] each injector firing. the plunger spring IS going to force the plunger back to "TDC"...and if there isn't sufficient positive fuel [B]pressure[/B] (regardless of volume)...the barrel cavity can entrain some air...especially with lower pressure at higher engine rpm. [/QUOTE]

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