Couple probs rzr started running like my plugs were fouled out so I changed my plugs n it started running right byte had a backfire when I would let off gas.. have countinued to ride it but last wkend it started running like plugs were fouled again (it has been couple months since last plug change) so I changed plugs now it won't crank! It's turning over n getting fire.. I pulled off fuel line at tank and up at injectors harness n is getting gas.. is there a certain amount of pressure the pump needs to put out? Or maybe could objectors b stopped up.. sensor?? I'm kind of stumped so any help would b appreciated.. Ty