Cornering hard, fuel starvation?

[Per]

last summer finally got my 15' TigerCat back on the water after a long restoration.
I riggged it with one of my somewhat modified Volvo Penta VP700 engines.
The powerhead came loose during the first race and that caused a major lack of cooling, we all know what that means...
Right now the powerheas is back on the bench waiting for two new pistons, good thing I keep some spare engines!

Now to my problem, when cornering hard the engine cuts out. The problem only occur when performing a left hand turn (or was it right, why didn't i write it down...)
I'm pretty sure the problem is fuel related.
I don't think the problem lies in the tank since I've tested with full tank as well as low fuel level.

Any toughts on what might cause this?

Pics showing what the fuel system looks like (and two very disappointed racer wannabes )



ADD: In picture below the top carb is missing and therefore two of the fuel lines are left dangling.