Paul,
    It looks like the RHS line on the left unit goes to the fuel rail. Looks
similar to an auto fuel filter/cooler I seen on a Soob conversion. Not sure
though ? Do you have a picture where you could see all four lines and the
engine ?

No but I will take another look. I think you are right. Why two?
I suppose one for each fuel tank.

Not likely - In the normal Velocity setup fuel is fed from a single sump tank, which in turn is
gravity fed from the two strake tanks.

Al

 
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