Step 5: Fuel Level Is Too High If fuel is pouring out of the sight plug then the fuel level is set too high, and the float must be lowered in the fuel bowl. a) Begin by lowering the fuel level in the fuel bowl to bring down the float.tep 5: Fuel Level Is Too High If fuel is pouring out of the sight plug then the fuel level is set too high, and the float must be lowered in the fuel bowl. a) Begin by lowering the fuel level in the fuel bowl to bring down the float.