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After 40 hours of fight in New Blue, I had an infight failure of the mechanical pump. It was brought to my attention by a low fuel pressure alarm which was set at 2.0 psi. I didn't really know that it was a failure because the engine never skipped a beat during the next twenty minutes it took for me to get back to base. With the cowling off, I could see that fuel had been coming out of the weep hole on the bottom of the pump. Not a great amount, but it enough to render the pump inop. So barring any failure that could cause a real blockage, the electric pump is more than sufficient to keep the engine running.
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Hey Man! Someone who has "been there and done that!"
Mucho thanks for that little tidbit, Mitch. Gives me a big dollop of confidence into this situation. Bob Bogash N737G |
We've just replaced the mechanical fuel pump on G-TWLV for the latest spec pump in accordance with Rotax Service Bulletin SB-912-063UL R1.
According to the Rotax Operators Manual, the max fuel pressure with the new pump (pump serial number 11.0036 and on) has increased to 7.26 psi (0.5 bar). The previous pump maximum pressure was 5.8 psi (0.8 bar). The minimum pressure remains the same at 2.2 psi (0.15 bar). On the first flight with the new pump the high pressure fuel alarm started sounding when on final approach at idle power. I've now changed the max fuel pressure limit in the set-up menu on our SkyViews. Our SVs were our own installation being pre-Van's SV avionics package. Perhaps Scott can advise whether the Van's supplied SVs can have the limit changed in the field or if it is locked. |
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