The problem was not due to carb ice.
The engine decided to die for me this weekend immediately after take-off, I still had about 200m of field in front of me so it was no problem to put down the Thruster safely. Once on the ground, the engine started on the first pull and idled smoothly, but as soon as I increased the throttle the engine died. I started to suspect fuel flow restriction so I opened the float bowls and the gasoline levels were very low. I switched on the electric fuel pump while the float bowls were removed and it was barely dripping any gasoline. So I changed the fuel hoses and the filter. The fuel flow now seemed to be in order, I started the engine and did some static tests. Everything looked good, but suddenly the engine stopped again. After some searching, I finally found the blockage, it was a loose piece of rubber inside the mechanical fuel pump.