AirTalk.org Aviation discussions newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Rotax 503 vacuum fuel pump          AirTalk.org Forum Index -> Light aircraft View previous topic :: View next topic   Author Message D H Guest Posted: Fri Sep 15, 2006 6:12 am    Post subject: Rotax 503 vacuum fuel pump I'm finishing up a TEAM EROS with Rotax 503, and am looking for more information on the vacuum fuel pump. It looks like the vacuum line would pull fuel into the engine if the diaphragm ruptured. I like the idea of an electric fuel pump as a back up. It looks like the electric pump should be in parallel instead of a series. I know you guys have the hours on the 503. Clue me in? Engine break in questions to come... Back to top Zoom Guest Posted: Mon Sep 18, 2006 9:04 pm    Post subject: Re: Rotax 503 vacuum fuel pump Here is a pretty good artical related to your question. http://www.challengers101.com/FuelSys.html Scott "D H" <Douglas_Hicks (AT) Comcast (DOT) net> wrote in message news:1158299024.627719.282570 (AT) i42g2000cwa (DOT) googlegroups.com... Quote: I'm finishing up a TEAM EROS with Rotax 503, and am looking for more information on the vacuum fuel pump. It looks like the vacuum line would pull fuel into the engine if the diaphragm ruptured. I like the idea of an electric fuel pump as a back up. It looks like the electric pump should be in parallel instead of a series. I know you guys have the hours on the 503. Clue me in? Engine break in questions to come... Back to top D H Guest Posted: Thu Sep 21, 2006 5:14 am    Post subject: Re: Rotax 503 vacuum fuel pump Well done. All questiones answered and then some! Thanks again! Doug Zoom wrote: Quote: Here is a pretty good artical related to your question. http://www.challengers101.com/FuelSys.html Scott "D H" <Douglas_Hicks (AT) Comcast (DOT) net> wrote in message news:1158299024.627719.282570 (AT) i42g2000cwa (DOT) googlegroups.com... I'm finishing up a TEAM EROS with Rotax 503, and am looking for more information on the vacuum fuel pump. It looks like the vacuum line would pull fuel into the engine if the diaphragm ruptured. I like the idea of an electric fuel pump as a back up. It looks like the electric pump should be in parallel instead of a series. I know you guys have the hours on the 503. Clue me in? Engine break in questions to come... Back to top Buster Guest Posted: Mon Oct 09, 2006 8:17 pm    Post subject: Re: Rotax 503 vacuum fuel pump The fuel pump for the 503 is a "Pulse" pump. If the diaphragm ruptures the fuel that is pulled in will be pushed in on the next stroke. This will only happen for one stroke as the small reed valve that allows the fuel in will hold the fuel out without a pulse to push it in. Not complicated, but works just fine. The problem is "WHEN" this happens. If it occurs at 500' agl, you're ok. If it happens at T.O. climbing 50'agl, ouch. No gassy......you crashy. On 14 Sep 2006 22:43:44 -0700, "D H" <Douglas_Hicks (AT) Comcast (DOT) net> wrote: Quote: I'm finishing up a TEAM EROS with Rotax 503, and am looking for more information on the vacuum fuel pump. It looks like the vacuum line would pull fuel into the engine if the diaphragm ruptured. I like the idea of an electric fuel pump as a back up. It looks like the electric pump should be in parallel instead of a series. I know you guys have the hours on the 503. Clue me in? Engine break in questions to come... Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         AirTalk.org Forum Index -> Light aircraft All times are GMT Page 1 of 1   Jump to: Select a forum Aviation----------------alt.aviationAviation safety EnhancementPlanes, gliders and flying in AustraliaAviation et pilotage (Français)rec.aviationAviation (Aerobatics)Hot air, gas balloons and airshipsHang-gliding, paragliding, foot-launched flightAircraft Design & BuildingInstrument Flight RulesAviation (Classifieds)Military AircraftNaval AviationAviation (Miscellaneous Topics)Owning AirplanesAviators (General Discussions)Aviation related productsAircraft RestorationHelicopters and rotary wing aircraftsFlight SimulationSailplanesAviation (Students)Light aircraftFlying related activities in the UK Airports----------------alt.airportsEdinburgh Airport Glasgow Airport Humberside Airport Luton Airport Aberdeen Airport Glasgow Prestwick Airport  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.