I have a 2017 Lincoln MKC "SUV" that has flapper valves in the fuel filler tube. In the past year I have had numerous check engine lights with the code for the fuel filler. I have been told by the O"Reilly counter person to bang the fuel nozzle in and out of the neck rapidly when I get gas to shake any dirt loose that may be trapped in the flapper valve. Does anyone have a solution to this problem?
If it's really debris, you can also use a good quality carb cleaner- which is combustible like fuel. Use a clean poker to hold it open, and spray it clean. I've not done this, BTW, just thinking about it.
Spray the flapper with WD40
It wasn't mentioned, so be sure to always tighten the cap until it clicks, else the ECU thinks there's a leak.
kb58 said:It wasn't mentioned, so be sure to always tighten the cap until it clicks, else the ECU thinks there's a leak.
There's no cap.
Most recent cars monitor fuel tank pressure as part of the emissions system. I suggest adding a cap and seeing what happens. I feel like part of the story is missing here.
His car has no fuel cap and never had one. It's designed that way. He can't just go buy a cap and install it. Ford (and others) been doing it that way for a pretty good while now.
kb58 said:Most recent cars monitor fuel tank pressure as part of the emissions system. I suggest adding a cap and seeing what happens. I feel like part of the story is missing here.
All of them have been monitoring for leaks since 1996, so... But "adding" a cap to a capless system isn't really an option, since the filler neck isn't designed to have one.
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