All,
Most, and our, fuel systems are designed so that the fuel pump is capable of pumping more fuel than the engine can consume at maximum output. In a "normal" presurized fuel system the fuel is almost constantly flowing thru a variable "restriction", the needle and seat. The taper on the end of the needle allows the fuel to flow at a volume dependent on engine demand. As more fuel is demanded, the float falls thus allowing more volume (and of course at lower demands the PRESSURE will in fact be higher and vise-versa) This is pure quess on my part but I suspect that if the fuel pump were allowed to run at high rpms (fast strokes) without back pressure you could get "flutter" in the valves or diaphram or pump cavitation. Bill To: [email protected] From: [email protected] Date: Wed, 29 Apr 2009 11:47:16 -0700 Subject: [ercoupe-tech] Fuel Pump Restrictor On the restriction of the fuel pump outlet. It seems to me that it would be more efficient to let the fuel pump free run without the restrictor and let part of the pressure bypass back to the inlet. Wouldn’t that take some of the load off the pump? Am I missing something here? Chris 99674 in restoration ‘--o-O-o--’ _________________________________________________________________ Rediscover Hotmail®: Get quick friend updates right in your inbox. http://windowslive.com/RediscoverHotmail?ocid=TXT_TAGLM_WL_HM_Rediscover_Updates2_042009
