Fuel pressure nominal for O-320

[flightlogic]

On my last leg home with the RV-9A, I had to climb to 10K due to WX. This plane has been at sea level since built 7 yrs. ago. The fuel pressure dropped twice to 1.9 PSI. I ran the boost pump and it returned to about 6 PSI. For the last half hour enroute it kept normal pressure without the electric pump. What should my next step be to keep things safe? Thanks any and all who respond.

 

[Low Pass]

Check the TCDS for the engine. I recall 0.5 - 8 psi as acceptable. I recall mine running down pretty low at altitude and other various times. Since converting to FI, I've purged that memory.

 

[Kyle Boatright]

Very common, and nothing to worry about unless you have symptoms which might indicate a problem (surging engine, for instance).

Lycoming recommends a minimum of 0.5 psi, so 1.9 is not an issue.

If you use the search feature of this page you will find numerous examples of people asking about this.

 

[flightlogic]

Thanks for very quick replies. Now I feel better. When you had 6 and then you have less than 2, it gets your attention. Not to mention the Dynon was programmed for a yellow caution below 2 PSI. The alert was startling.
Will check the specs and confirm, but for now.... thanks much.