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Did you ever find out what was wrong with you're fuel system? I think I have the same thing with my 2011 Evo X... I have the rubber in the Tiney filter. Afr is at 14.7 on cold start, then 12.5 when warm? I had my return line fy the Tiney filter drilled out 5/16the then wasrunning out of gas at1/4-1/2 tank... Now I bought anew fuel pump assembly. And afr at idle is all over the place?