My RV-12 has a switch for the fuel pump. I use the electric fuel pump for start, take-off, climb, descent & landing. Returning from last X-C with electric pump off in cruise, I noticed low fuel pressure (wiggling between 1.5 psi and 2.5 psi, bottom of green set at 2.2 psi). Engine running normal. Switched on electric fuel pump, fuel press instantly returned to green, fuel flow rose into the red ( 11 gph), smelled fuel. Then within 7-8 seconds, fuel smell rapidly dissipated, fuel flow returned to normal (5-6 gph), fuel pressure remained steady in the green. Since I had plenty of altitude, returned home using airport-to-airport routing, switched pump off again. Fuel pressure dropped again, flirting continuously with the lower yellow arc. Engine ran normally.
Spent the day today opening up, inspecting, tightening. Found no leaks. Could not duplicate with electric pump on, or even in a ground run. Test flew in the pattern; same scenario over again: Low fuel pressure with pump off. Momentary spike in fuel flow and smell of fuel momentarily when pump switched on, then normal.
Anyone seen this one?
Thanks,
Jim R.
Spent the day today opening up, inspecting, tightening. Found no leaks. Could not duplicate with electric pump on, or even in a ground run. Test flew in the pattern; same scenario over again: Low fuel pressure with pump off. Momentary spike in fuel flow and smell of fuel momentarily when pump switched on, then normal.
Anyone seen this one?
Thanks,
Jim R.