How's the fuel going anywhere? The PV is on the power circuit. In order for any fuel to be added from the PV, there MUST be enough air passing over the boosters to do it and there ain't nowhere near enough at idle. Additional fuel from the PV ain't happenin at idle. That's a myth that needs to die. I've had a 12.5 in mine for almost the past two years and it's fine as wine. Plugs read good too.