Originally Posted by Piper J3
Why not just raise the upper alarm limit and let the pump run all the time? I'd rather have fuel pressure/fuel flow slightly above spec rather than no fuel flow because mechanical pump failed and electric pump was switched off...
Well, Jim, that’s the beauty of this wonderful thing called experimental aviation. We all get to make the decisions that provide the best tradeoffs in our individual situations. No right or wrong, just choices. I chose the path that preserved the accuracy of the fuel totalizer function in the D-180. Even at my advanced age I can remember to run the pump at low altitudes. Checklists help!
In your case, if running the pump continuously causes no problems, by all means let her run!
Also - a word of caution - your last post could be interpreted as speculation and it would be a shame to get this thread shut down.
John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
“Master Pilot” Award, UFO Member.
RV-12 N37JP 120176 Flying since 2012.
One Week Wonder Build Team, OSH 2018.
VAF paid through 10/2019.