This is what the Facet site says about the 40105: FACETMIN-MAXANTI- PARTSHUTOFFPOSITIVEMIN DRYFITTINGQUIETCHECKSIPHON NO.PRESSUREGPHLEADLIFT INCHESSIZEVALVEVALVEVALVE
401053 - 4.530121/8-27 INTNONONO I have 2 40105N, connected in parallel. I ran tests on these pumps and those tests are documented at: http://krbuilder.org/FirewallForward/FuelSystem/FuelPumpTests/index.html I can confirm that the valve is NOT quite, but it does act like a check valve and has some anti-siphon characteristics. I do not have any check valves in my system. The fuel will flow with both pumps turned off. However, I have both pumps ON for take off and landing. My system is also gravity feed from the header tank. See N64KR at http://KRBuilder.org - Then click on the pics See you at the 2007 - KR Gathering There is a time for building and a time for FLYING and the time for Flying has begun. Daniel R. Heath - Lexington, SC -------Original Message------- http://www.facet-purolator.com/solidstate.asp to get a clue as to how many types there are, and to see which one might suit you best.
