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
