EVAP / Fuel fill issues

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kb9mfd

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Oct 24, 2024
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I have two issues that may be related. One, I am getting a small and a large EVAP leak error. Second, when you put fuel in, you must put it in slowly because if you try to fill quickly, the pump almost immediately stops. I am thinking these might be related, but how? First, I checked the purge, and it is working correctly. I also visually checked the hoses, and all is good there. I have on order a smoke test unit, my next step. The only clue I have now is that there is a hissing sound around the fuel tank when the engine is running and warm, so I am guessing that may be a leak. I am hoping the smoke test will reveal that. But what is puzzling: when I try to fill, the pump keeps stopping. If there were a leak in the EVAP, I would think the tank would be venting, at least abnormally. I guess these issues may be unrelated, but when I look at the diagrams, there appears to be a vent controller thingy on the top of the tank. Can that thing go bad and cause both issues? Both causing the EVAP leak and not venting the tank when filling?
Thanks
 

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