First off, N397RV is a now a flying airplane in MN (RV7A). Phase I flight completed. Upon flying off my time and working the systems, the one item that has been bothering me is my fuel pressure. The aircraft is equipped with a Dynon engine monitor and the power plant is an O360 carborated. The fuel system is standard plumbing per Vans with electric fuel pump and engine driven fuel pump. The nature of the problem is that the fuel pressure is erratic. Sometimes it will settle down to 1.9 psi without the electric fuel pump on. Once turning on the electric fuel pump it will raise the pressure up above 6 psi (correct me if I'm wrong, is it true that the needle and seat in the carb shouldn't see more the 5 psi or could cause some damage??)
Also, I noticed that my fuel flow will jump from a set cruise when the pressure is that high from 8.5 gal/hr to 12 gal/hr without changing the engine settings. Upon cleaning the belly of the aircraft, I noticed that I have a blue streamer on the belly. Is it that I am pushing the fuel overboard by pushing too much psi fuel pressure?
Please share any thoughts or ideas as to what I should due to tackle this problem and what should I be concerned about?
Thanks, Butch
Also, I noticed that my fuel flow will jump from a set cruise when the pressure is that high from 8.5 gal/hr to 12 gal/hr without changing the engine settings. Upon cleaning the belly of the aircraft, I noticed that I have a blue streamer on the belly. Is it that I am pushing the fuel overboard by pushing too much psi fuel pressure?
Please share any thoughts or ideas as to what I should due to tackle this problem and what should I be concerned about?
Thanks, Butch