George,

Well, there are "low pressure systems" and "low pressure systems".  Depends on the point of view, I guess.  We're not talking about high pressure direct injection (GDI) systems that are now all the rage.  The original Bendix system ran at 39 psi - a little higher than the Bosch systems at the time,which were, I think 29 psi (exactly 2 bar - a coincidence?) systems.  The reason was that one of our applications was the Cadillac V8 and the injectors were in a hotter location.  The higher pressure was to keep vapor formation at bay during a hot soak.  Then some turbo Chrysler applications used 60 psi for the same reason.  The injector design was the same and most injectors will still open at pressures up to about 100 psi.  There were some lower pressure systems (about 20 psi, I think) that used clever injector designs to reduce sensitivity to vapor formation.  Well, I thought they were clever because some were mine.  Higher pressure operation can improve atomization, but that isn't a big consideration.  Lower pressure systems once allowed a lower cost fuel pump to be used, but that isn't true any more.  No, I don't think lower pressure systems are coming back.

 

None of this discussion pertains to the "Bendix" aircraft injection system, which is a totally different concept.

Gary