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High Fuel Pressure Spikes (Read 215 times)
Jul 22nd, 2018 at 10:31am

RichB   Offline
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On my last flight I was getting intermittent high fuel pressure readings of 8 - 10 psig with the P4055-5025-1 Kavlico fuel pressure sender on a Rotax 912 ULS. The engine continued to run smoothly. Previously the fuel pressure had been solid at 5 - 6 psig. Although I haven't checked wiring/connections yet, I don't imagine high readings to be a wiring issue. Could this be indicative of a sender failure?
TIA
 
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Reply #1 - Jul 31st, 2018 at 4:45pm

Dynon Avionics   Offline
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It's a possibility. It could also be something else in the fuel system. I can't say we've heard of them failing in this way with any real frequency though.
 

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Reply #2 - Aug 10th, 2018 at 6:35pm

Downunder   Offline
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I think Rotax had a bad batch of pumps wnen the newer model came in (the one with the screws around the face) but I think the pressure was high from start.

At 8 to 10 psi, you would think the pressure would overcome the carb float seat.
Any indication of running too rich (low egt's) or fuel leaking out of the carb?

I just installed the fuel press sensor last week on my uls.
I'm getting 6.3 to about 3.3 at wot.
 
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