Hi with engine running only the metered amount will be allowed by needle setting,if you let it sit fueled you might get a syphon effect, close the needle none should run into the engine, and I do not let them sit around fueled , its fill start and go martin

Forgot my Nouvo 1300 electric to diesel conversion TT10GP Davis head set up to the same height and this runs muff pressure runs fine no issues

well progress wiring complete went larger wheels 2 1/2 inch for grass field and wngine area painted