07 sportsman 500 efi. Not getting fuel
 

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Hello. First time poster here.
Had the quad out on the weekend. Started fine, drove 30 feet and it was like someone pinched a gas line, just went blahhhh. Literally.
If I feed it carb cleaner it will fire and somewhat run. It's like it just stopped getting fuel.
So I took it to the Polaris dealer today and they were kind enough to come outside and plug there computer into it and give me the codes.
I think it's pretty clear it's a wiring issue. Just where to start is my issue. I work at a mechanical shop and am pretty savvy at mechanical stuff. What end of the wiring do you suggest I start at.
Everything I read says the t-bap harness is crap. Any other suggestions? Thx.