> >What kind of car do you have Phil? I think it is the latest trend.
     > >I specifically asked Jim Mederer if the ECU controlled the pump pressure
     > >on the RX8 and he said no. He could be wrong as there is no real way
     > >of knowing unless you hook a scope to the pump wire feeding electrical
     > >power to the pump. On the other hand Jim has considerable experience with
     > >the RX8 engine on his dyno. He tells me the pressure regulator is built into
     > >the pump.
     > >
     > >In theory all you really need is a electronic pulse width controlled pump
     > >for a constant dribble fuel injection system. No electronic injectors.
     > >No pressure regulator. Probably work fine for an aircraft engine.
     > >Less parts to fail.
     > >
     > >Paul Lamar

     > >A Ford Focus. I didn't know there was any difference, until I turbocharged my car. There's a controller next to the
     pump that adjusts the pulse width. I still have injectors though. I'm missing something...how do you eliminate the
     injectors?
     > >
     >      Phil Williamson

     Ah So another Ford product.

     There are two things you don't need in an aircraft system. Smog controls and good idle.
     There are hundreds of thousands of airplane engines out there with a constant
     mechanical dribble fuel injection system. More fuel speed up the pump. Less fuel slow
     the pump. Based on RPM, manifold pressure and intake temp. The last two could
     be manual (pilot) feed back from the EGT's.

     Paul Lamar

     Phil and Paul,
     Fords started using a 'returnless' fuel system in 1996 with the emissions requirements of OBDII - I think that most
     all manufacturers went to this method that year as well.

     Ken Powell

 
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