Да или так:
Код:
    if level < level3 then
        pump1:=true; pump2:=true;
    elsif level < level2 then
        pump1:=false; pump2:=true;
    elsif level < level1 then
        pump1:=true; pump2:=false;
    else
        pump1:=false; pump2:=false;
    end_if