Trying to track down inconsistent fuel pressure readings.
RV4, O320, Dynon display with Kavlico sensor. Running 91octane mogas.
Electric boost pump and gascolator in tunnel in cockpit as opposed to on firewall.
Pressure normally reads 3-5 psi when running on engine driven pump. On occasion, it will drop down to 0-.05psi. I believe these readings are accurate as the engine will eventually stumble when pressure reads 0. Selecting the electric pump on brings the pressure back up to 5-6psi. After a few moments , selecting the electric pump off results in 3-5 psi from the engine pump but not consistently. Pressure will occasionally drop back to lower readings.
I have read multiple threads about pressure issues but still unsure if I have an engine driven pump problem or it is something else.
Another data point from test flight today, pressure will drop when doing a loop or when pulling 3-4G during a tight 360 when electric pump not on. Tanks have flop tubes.
I have Pressure tested the system and did find a small air leak on the electric boost pump but repaired it. Going to pressure test system again while I await comments.
Thanks, Tom
RV4, O320, Dynon display with Kavlico sensor. Running 91octane mogas.
Electric boost pump and gascolator in tunnel in cockpit as opposed to on firewall.
Pressure normally reads 3-5 psi when running on engine driven pump. On occasion, it will drop down to 0-.05psi. I believe these readings are accurate as the engine will eventually stumble when pressure reads 0. Selecting the electric pump on brings the pressure back up to 5-6psi. After a few moments , selecting the electric pump off results in 3-5 psi from the engine pump but not consistently. Pressure will occasionally drop back to lower readings.
I have read multiple threads about pressure issues but still unsure if I have an engine driven pump problem or it is something else.
Another data point from test flight today, pressure will drop when doing a loop or when pulling 3-4G during a tight 360 when electric pump not on. Tanks have flop tubes.
I have Pressure tested the system and did find a small air leak on the electric boost pump but repaired it. Going to pressure test system again while I await comments.
Thanks, Tom