Ok so my viair 480's are probally 2 yrs old now and the truck was apart for almost a year and half so there isnt a ton of usage on them but they are taking for f'ing ever to fill my 9 gallons.. ive check the filters and they are clean and look good and i also removed the leader hoses from my tank to make sure the plastic inside wasnt crushed.. had my wife turn on the compressors and im barley getting any air coming out of both of them.. my set up didnt have water traps on it when i got it either.. i timed it today and it took 9 min to fill 9 gallons w 2 480's.. any suggestions of what can be wrong cuz i dont think they are shot i feel like has something to do with my leader hose/check valve or something.. any suggestions before i do anything else.. also i havent checked the hose end at the head of the compressor yet.. please help thx guys