With the restrictor on the outlet side of the pump, pressure is built up in the pump. The pressure on the diaphragm keeps the operating lever off of the cam until the pressure is relieved by the trickle of fuel to the header tank. Thus the pump is only working part of the time. This prolongs the pump life.
At least that is the way it was taught to me in hard knocks 101. Andy Anderson N93609 _____ From: [email protected] [mailto:[email protected]] On Behalf Of Chris Sent: Wednesday, April 29, 2009 1:47 PM To: [email protected] 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--'
