HIIFLY
Well Known Member
I have been flying my RV-8 IO-360 for over a year now 115 hrs , the eng has 325 TTSO and I installed a O/H fuel pump at the O/H . The mech fuel pump has always pumped in the 22 to 24 lbs. area in cruse power . I noticed last week it has dropped to 18.5 to 21 lbs. in cruse . BTW the Air Flow elect boost pump pushes it up to 33 lbs then settles at 26 lbs in cruse . I have opened ALL the screenes and checked them , ALL clean . No leaks in my system . I blead the hose to the fuel sending unit . and also checked the pressure readings with a borrowed mech. gage and long hose . same pressure readings . So my sensor is right on . I understand that my Operating Pressures are from 14 psi to 45 psi , in the GREEN ! So you might ask me , WHATS MY PROBLEM ????
Well the pressured dropped a little from NORMAL ! Is this a SIGN of something wearing out in the Mech Pump ? Like a SPRING ??? Will it wear slowly ??? I don't know if anyone has an answer for me but I would like any in put you can give .
Also the Mech. Pump p/n LW-15473 advertised 24/ 25 lbs. pressure new .
Well the pressured dropped a little from NORMAL ! Is this a SIGN of something wearing out in the Mech Pump ? Like a SPRING ??? Will it wear slowly ??? I don't know if anyone has an answer for me but I would like any in put you can give .
Also the Mech. Pump p/n LW-15473 advertised 24/ 25 lbs. pressure new .