Cometravi ! !

Welcome back.

Let me clarify regarding float type carb and fuel pump.

1. You can use high tank and gravity fuel flow.

2. You can use the flaot type carb with certain reservations. The problem is fuel level that will be frequently disturbed due to bank and pitch of the plane, even if it is a floater type of plane. This upset happens in motor cars and bikes as well but they can live with it because the engine is connected to wheels that keeps it turning. In airplanes such upsets can stop the engine and you need to land immediately. So better go ahead and give it a try. Let us also know the results.

3. You cannot use the windshield washer pump because a) the material might not be compatible with petrol b) they dont have a system to stop & work on demand.
The fuel pump in motor cars can be used but they are too heavy for a model airplane. Pressure is no problem, the float type carb is made to handle it.

Good Luck.