As long as you get one and a half times your full throttle fuel flow with the plane in a nose up climb attitude and minimum fuel in the tank I would not put in a fuel pump. Put about four gallons in the tank and see how long it takes to drain two gallons out to measure the flow rate you have.
Brian Kraut Engineering Alternatives, Inc. www.engalt.com -----Original Message----- From: [email protected] [mailto:[email protected]]On Behalf Of patrusso Sent: Saturday, November 13, 2004 2:05 PM To: KRnet Subject: Re: KR> Facet #40108 Brian, Right now I have gravity feed from header tank to carb. If I added a facet pump on the fire wall,.. low, next to gascolator, could I also have a fuel line by-passing that so that I only have to use it in a pinch? I have a zenith carb,...how do I regulate the fuel pressure to that when using the pump? I worry about flooding or using more fuel than is needed. Right now the gravity works very well, so I am not sure why I need a pump save for the constant doubts I am developing, perhaps by reading too much in these recent discussions. ----- Original Message ----- From: "Brian Kraut" <[email protected]> To: "KRnet" <[email protected]> Sent: Friday, November 12, 2004 9:23 PM Subject: RE: KR> Facet #40108 > Another thing or two to keep in mind when designing fuel systems with the > Facet pumps. > > You shoud have the pump mounted low in the system if possible. I had one > mounted on the back of my header tank to transfer fuel from the wings to the > header. I did some experimenting first to see if the pump would suck up > fuel through a dry line from up that high and it worked fine. In operation > a few times after it was installed it refused to suck a prime through the > line. A good slip with the wing of the selected tank high would usually be > enough to get a prime sucked in the line and start it pumping normally, but > mounting the pump lower would be a lot better. > > The Facet pumps restrict the fuel flow some when not running. I put one on > my firewall as a boost pump for the header tank and found that it restricted > fuel flow enough when it was not running that I couldn't throtle past half > before the engine would start coughing. I measured the fuel flow and then > removed the pump and increase the flow by over double what it was going > through the pump when it was not running. > > Keep the odd shortcomings in mind and the pumps work very good. > > Brian Kraut > Engineering Alternatives, Inc. > www.engalt.com > > > > _______________________________________ > to UNsubscribe from KRnet, send a message to [email protected] > please see other KRnet info at http://www.krnet.org/info.html _______________________________________ to UNsubscribe from KRnet, send a message to [email protected] please see other KRnet info at http://www.krnet.org/info.html
