So I bought the 450 new a few years ago, it still ONLY has 80hrs on it. Went through about 5 new fuel pumps in the first few months then went though a lot of moving and haven't road it in about a year. First I replaced the battery, drained and cleaned the fuel tank, replaced the fuel pump, replaced the air filter (because a rat was living there), changed the oil and filter, new gas, new spark plug, even replaced the fuel injector because fuel is pumping from the hose but not getting passed the injector. Tried cleaning the injector still no luck so I replaced it. If I pour a little fuel in the hole where the injector goes it will run for a few seconds until it runs out of fuel. I checked to see if there was power coming from the plug that goes to the injector and there is. So could it be a computer problem not telling the injector to open or am I missing something?

 

Rats have a habit of chewing wires, so be very sure that there isn't a wire or two parted somewhere. I don't work on Polaris, "the boss" won't sell or fix them, but injection machines have diagnostic plugs so the dealer can check the electronics, it may be best to let them check it.