I saw this in my Archer II late last year, pressure on the mechanical pump dropped to about half its normal position. Applied the electru0ic pump and it went to normal, after a minute ir so, electric pump off and it stayed in the normal position - never happened since. Was at 6,500 half way direct Barbados to Canefield, Dominica, 2,200 rpm, 14C OAT, full tanks at Barbados, so likely maybe 40 gallons at the point I saw the "problem".