skippydiesel Posted May 31, 2023 Share Posted May 31, 2023 Did an hour yesterday, in the Sonex (without the seal on the fuel pressure sensor/plug) - no sign of the intermittent low fuel pressure indication/warning - looking good! Will not make any further comment ,until several hours have gone by, without a low pressure warning. 2 1 Link to comment Share on other sites More sharing options...
danny_galaga Posted June 1, 2023 Author Share Posted June 1, 2023 Funny the things you learn along the way! Thanks for keeping us up to date. Now I just need to find out what the pin-out is on this plug 1 Link to comment Share on other sites More sharing options...
IBob Posted June 1, 2023 Share Posted June 1, 2023 Danny, as I recall, my engine came with the sensor/sender (we just used to call them transducers) fitted, with the plug and cable attached. The cable would have been marked, so no need to meter through to the plug pinout. If all else fails, maybe you could find someone with a new uninstalled engine, and get them to meter out the cable/plug for you. 1 Link to comment Share on other sites More sharing options...
danny_galaga Posted June 1, 2023 Author Share Posted June 1, 2023 16 minutes ago, IBob said: Danny, as I recall, my engine came with the sensor/sender (we just used to call them transducers) fitted, with the plug and cable attached. The cable would have been marked, so no need to meter through to the plug pinout. If all else fails, maybe you could find someone with a new uninstalled engine, and get them to meter out the cable/plug for you. Might have a look at the Tecnam my engine came out of. See if I can figure it out from there... Link to comment Share on other sites More sharing options...
facthunter Posted June 1, 2023 Share Posted June 1, 2023 THAT sort of information shouldn't be hard to find. Plenty would want to get it right. Nev Link to comment Share on other sites More sharing options...
IBob Posted June 1, 2023 Share Posted June 1, 2023 Agreed, Nev: if buying from a transducer manufacturer or supplier, it would all be on the data sheets. But Rotax have gone to their own numbered part (albeit manufactured by others) so unless we have a non-Rotax part number for the unit, we're guessing a bit. Unless Rotax have published details somewhere.....they may have. Link to comment Share on other sites More sharing options...
danny_galaga Posted June 1, 2023 Author Share Posted June 1, 2023 Actually just realised Skyreach should know, since they build factory planes as well as kits. Will email them now 🙂 Link to comment Share on other sites More sharing options...
IBob Posted June 1, 2023 Share Posted June 1, 2023 Okay, so I found this, which suggests that they are using a 2 wire current loop setup: https://duckduckgo.com/?t=ffab&q=pinout+of+rotax+oil+pressure+sender&atb=v356-1&iax=images&ia=images&iai=https%3A%2F%2Fdesk.zoho.com%2FDocsDisplay%3FzgId%3D714941653%26mode%3Dinline%26blockId%3D1hflqdbff7005142a40f9ac47410e66c421a2 It says that Pin A = n/a Pin B = 8-24VDC (12V in our case) Pin C = Signal And here is how it is wired to the gauge: https://duckduckgo.com/?t=ffab&q=pinout+of+rotax+oil+pressure+sender&atb=v356-1&iax=images&ia=images&iai=http%3A%2F%2Fwww.aviasport.com%2Fimages%2FConexiones_OIL_P_4_20_57.gif Danny, I found that by searching 'pinout of rotax oil pressure sender'. Link to comment Share on other sites More sharing options...
IBob Posted June 1, 2023 Share Posted June 1, 2023 And here is a the A/B/C pinout: https://duckduckgo.com/?t=ffab&q=pinout+of+rotax+oil+pressure+sender&atb=v356-1&iax=images&ia=images&iai=http%3A%2F%2Frepairguide.autozone.com%2Fznetrgs%2Frepair_guide_content%2Fen_us%2Fimages%2F0996b43f%2F80%2F20%2F27%2F4c%2Fmedium%2F0996b43f8020274c.gif 1 Link to comment Share on other sites More sharing options...
Blueadventures Posted June 1, 2023 Share Posted June 1, 2023 Just to add some real world experience. Had a UMA air switch connected as per the wiring diagram. After much disappointment of it not working and about to send back tried reversing the positive and negative and it worked. A go figure moment. Working still now 345 hours later. Murphy is always up there springing surprises. 1 1 1 Link to comment Share on other sites More sharing options...
danny_galaga Posted June 1, 2023 Author Share Posted June 1, 2023 3 hours ago, IBob said: And here is a the A/B/C pinout: https://duckduckgo.com/?t=ffab&q=pinout+of+rotax+oil+pressure+sender&atb=v356-1&iax=images&ia=images&iai=http%3A%2F%2Frepairguide.autozone.com%2Fznetrgs%2Frepair_guide_content%2Fen_us%2Fimages%2F0996b43f%2F80%2F20%2F27%2F4c%2Fmedium%2F0996b43f8020274c.gif I must admit my Google-fu was weak with this one. Gauge hookup is a no brainer, I've already wired it as per diagram on the housing. Link to comment Share on other sites More sharing options...
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