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I've read a number of topics but I think I have a unique problem.
There are two hoses on this pie shaped vacuum. One of the hoses has sufficient suction to both open and close the door depending on which valve you connect it to. The other hose has no suction whatsoever and I believe that this is the culprit.
Why would one hose have vacuum and the other not? They both seemed to hooked to the main unit (just over the front right tire) okay and the hose that doesn't work seems to be in fine condition.