was riding today and my 09 rzr quits running if u let off gas...go to start and unless u give it gas it wont start and it wont idle...i started with a reall rough low idle then by end of day it would not idle at all...air filter is clean...my buddy has a rzr a rzr s and now a rzr 4 which is doing the same thing ...he said his all have done it and the fuel pump is starting to go bad...is there a way to check it..ne suggestions...hate to buy pump if thats not the problem