> In studying this LEZ system a little more, it seems that:
> 1. If one fuel pump failed, the engine would quit, so you must switch> to the other pump to restart the engine, AND that tank must have fuel.
> This means you can't ever run either tank near empty, because you might> need the pump on that side.
>
> 2. If the solenoid stopped working, it is also a single point failure> that could either block fuel from coming back from the rail, or dump
> fuel back to the wrong tank.
>
> Am I missing something?
>
> Scott Gettings



 1. Switch tanks every 30 minutes. Keep 45 mins reserve = good airmanship.
 2.  Switch to the default tank. If necessary switch back to the non
default tank, then, when it is empty, go back to the default tank.

If you run two pumps into one regulator the fuel pressure rises
substantially, if you are running open loop efi the mixture will go overrich.

Ian Beadle.

Interesting approach.  You still must keep an adequate reserve in both tanks, because you don't know which
one you might need if a pump were to fail.

I'm using Walbo 190lph high-pressure pumps and an SX regulator.  I tested this setup with one and two pumps
running.  The pressure at the regulator remained the same -- just a lot more fuel got bypassed.

Scott Gettings

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