Craig Williams wrote: > My second switch is to bypass all that and provide a ground to run > the pumps when priming and starting and if the oil pressure switch > was to fail. How would you label thatswitch?
"Emergency Pump". You need it to be as clear as possible when you or the guy who flies it later needs it, and only has 2% of their wits about them due to the prop stopping! You realize that you won't have any fuel pressure until the engine turns over enough to trip the oil pressure switch, right? That's going to prolong starting. Personally, I'd use a VW fuel pump relay, which has a connection to the coil and powers the fuel pump during cranking and also disconnects it when the engine quits (crash). And for those who think they'll switch the pumps off before they crash, these things happen quickly and when I glided for 15 minutes into a beanfield, I not only didn't think to turn the pumps off, but I also didn't think to shut the fuel petcock off. Yep, I should of had a checklist for that! I was concentrating on getting the thing on the ground safely. There's more info on this setup at the bottom of http://www.n56ml.com/fuel/index.html ... Mark Langford ML at N56ML.com http://www.n56ml.com
