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Re: Third fuel pump on 912 iS engine installations
by Roger Lee » 7 years ago
Have you verified this odd low pressure with a mechanical gauge?
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
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Re: Third fuel pump on 912 iS engine installations
by james porter » 7 years ago
Yes I have a pressure/vacuum gauge.
I measured the fuel system on the firewall side at the course fuel filter.
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Re: Third fuel pump on 912 iS engine installations
by Roger Lee » 7 years ago
You may want to increase the hose size to a minimum 3/8" and if the hose is a tad small make sure it isn't collapsing when the pumps are trying to draw volume.
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
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Re: Third fuel pump on 912 iS engine installations
by james porter » 7 years ago
These numbers don't suggest that any change is necessary. Obviously the fuel system is capable of delivering sufficient fuel. Under a full load with both pumps running there is zero vacuum/suction in the system. There would be zero possibility that the hoses would collapse.
My testing was done to determine if the pumps were creating excessive negative pressure (suction) and therefore increasing the possibility of fuel vaporization. They do not.
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