lml@lancaironline.net Mailing List Archive

Thanks for your comments Paul. That is why I thought it important to mention that the fuel flow remained normal and unchanged. If the fuel flow changed up or down with the increase in pressure I would certainly be looking at a true mechanical problem. Especially with an increase in pressure and a reduction in flow. This would indicate at restriction. But I certainly will be looking at everything. Bryan On Nov 28, 2009, at 3:31 PM, Paul Bricker wrote: Bryan, If you really have excessively high fuel pressure (not a bad sender) the fuel flow can go high enough to cause a major power loss. One known failure mode is in the aneroid in the fuel pump. It is designed to maintain proper pressure as the outside pressure goes down with altitude. It can fail to maximum possible pressure, causing excessive fuel flow, power loss, black smoke, etc. During take-off this can be a critical failure. Always monitor fuel flow, and, if you have to, control it manually using the mixture control until you can land and fix it. Paul Bricker N63PB -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of Burr Bryan Sent: Saturday, November 28, 2009 9:55 AM To: lml Subject: [LML] Fuel Pressure Gents, Regarding a Continental TSIO550E, climb power 34.5" RPM2500, Full rich 33 gph. During a recent flight I experienced higher than normal fuel pressure. The fuel flow was unchanged 33 gph as were the egt and cht temps. Normally my fuel pressure is 36 psi but it climbed to 40 psi and the Chelton audible warning to "check engine" came on. It is set to come on at 39. Typically I would be suspicious of high pressure if fuel flow had dropped as this could indicate a restriction. But everything else remained normal. Low pressure could indicate several things such as broken line, failing pump, restriction, etc. So what are the concerns with high fuel pressure? What are the trouble shooting steps? I suspect a possible wiring or sending unit issue? Thanks Bryan Burr N132BB -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html