Just made the trip from SoCal (sea level) to Colorado Springs (6000+ft) and I noticed that my lift pump gauge showed a 3psi drop (6psi from 9psi). This happened the last time that I came out here as well. Is this just a drop on the gauge due to the barometric pressure being about 3psi lower up here or a drop in overall fuel flow volume? Basically what I am trying to say is my pump still flowing the same volume up here and the gauge is just reading low or is the fuel flow affected as well? Should I turn the pump back up to an indicated 9psi on the gauge or just leave it as is?
