Otto Skorzeny Here in Illinois where it gets colder than a well diggers butt,I cut the flap out,weld the holes shut with stainless. Then using new forklift propane carburetor fix my trucks so they will start and run in cold or heat,no sludge,oil stays clean,no fuel pump,no dirty lines or tank. Just one filter,can trouble shoot easily,keep an item or 2 with you on the road. Also never cold natured,don,t wash cylinders down every day with gasoline !!