Yes, the pumps were always the " Weak Link" with these stoves and still are. The cheesy plastic pump should be well " Lubed Up" before any trip ,, and if it's a big climb or winter trip, pack an extra 4 oz. pump if this is your only stove on the trip... Tip: MSR Stoves Are either " On " or " Off" and rarely simmer well. ( Shown in use in my old "Wheelbarrow" which is a could stove tester area on front porch in 4 ft. of snow...