Drain the header tank ? Why?
The fuel inlets for the header tank are above the fuel level. It can't drain back when you open the pump. Also the overflow exits at the header fuel level and goes to the mains anyway. The fuel pump itself is sorta disconnected, not under pressure from the header tank. It works only by suction. and then pumps what ever it gets to the header tank. If you really need to prime the pump, then the valves in the pump might not work properly. The pump pumps air as well as fuel when normal. Of course a liquid is more efficiently pumped than compressible air. But a good pump can do both. Fuel pump that is. Hartmut To: [email protected]; [email protected] From: [email protected] Date: Sat, 16 May 2009 18:15:52 -0500 Subject: RE: [ercoupe-tech] Fuel pump Hartmut, It sounds like they completely drain the header tank in order to do the inspection on the fuel pump? Is this normal or necessary? If the problem is that the header tank is empty as well as the pump itself, then why not pour some fuel into the header tank from the airport fuel pump or from the fuel can they drained the fuel into? (By the way, is the input line for fuel coming into the header tank at the bottom or somewhere up the side?) There’s certainly no need to hook an electrical pump up to prime the mechanical pump – Coupes run the main tanks dry every once in a while. They get back to pumping with no intervention. I’m not knowledgeable in this area. Curious. Ed _________________________________________________________________ Hotmail® has a new way to see what's up with your friends. http://windowslive.com/Tutorial/Hotmail/WhatsNew?ocid=TXT_TAGLM_WL_HM_Tutorial_WhatsNew1_052009
