I have a 2007 Polaris Sportsman that has roughly 1700 miles on it. My wife and I were out riding on our local trails last weekend and as we were riding along (at approximately 20mph) the ATV just died. It was like someone shut the key off but the instrument panel was still on. We tried starting it several times but it wouldn't even attempt to fire. We were in an area with really poor cell reception but we managed to get a text message to my son who lived within a few miles and he was able to come tow us home. So here is what has been done, and here is what I've observed. Before this though, it does have a new Quantum fuel pump, new fuel filter, the injectors have recently been serviced, it has a new OTB wiring harness for the MAP/MAF. Okay, so the next day I try to start it, but it won't fire. So I start messing around. I unplugged the MAP/MAF, still nothing. Unplugged the TPS and gave it another try, it sputtered a bit. Shot some ether into the throttle body and she came to life, then died. Tried starting again without ether and it would start and idle fine but when you try to give it throttle it dies. When idling if I hook up the MAP/MAF it idles roughly but only for a few seconds then dies. Unplugged MAP/MAF, started up and idling fine, plug in TPS, instantly dies. This is repeated several times with the exact same results. So I ordered both a new MAP/MAF, and TPS. Installed both of the and with or without them hooked up it idles roughly and not for very long. I've attempted adjusting the TPS, and the best it will do is the rough idle for a few seconds then dies. I have on a couple of instances (before the new MAP/MAF and TPS) been able to rev the engine up if I go into the throttle extremely slow...not very time though. Anyway, if you have any questions I will try to answer them as promptly as I can, and if you have any suggestions I would sure appreciate it. I'm at my wits end with this. Thanks

 

We’re you able to find the problem?

 

A bad battery will cause all kinds of weird things on a fuel injected machine. Take a look at it.

 

Check your fuel pressure. Just because you have a new pump does not mean it is performing as it should.
I have seen guys use brand new Quantum
pumps go bad in less than a month.