Hi Carl,
In the other thread on no/hard starting Robin's, I made a refence to a pair of 2400's that were in the shop and shared comments on the fuel system as described by the shop tech.
Read down through that whole thread for some Robin background...
...Question on the 2422...where is the fuel tank with respect to the pulse-type fuel pump...relative level,distance,etc?
Why do you feel it is a fuel draw prob...How's hot weather op's?
...Sorry for more questions, just trying to get a better feel for your problem...If someone has a 2400 model, maybe can jump in here...
...That wasn't you in the Oswego,Ill. shop ...Was It?