Failed emissions due to bad fuel cap
#1
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My XKR failed an emissions test recently due to the fuel cap, it couldn't hold pressure according to the guy administering the test.
It passed last year, any chance his machine was wrong or is it common for a fuel cap to fail like that? Just seems odd for a fuel cap to go bad, I thought a code might appear if it did.
I didn't want to try another tester and spend another $15 when I could order a fuel cap for around $25.
Anyone else experience this, what did you do? Best place to order new fuel cap?
It passed last year, any chance his machine was wrong or is it common for a fuel cap to fail like that? Just seems odd for a fuel cap to go bad, I thought a code might appear if it did.
I didn't want to try another tester and spend another $15 when I could order a fuel cap for around $25.
Anyone else experience this, what did you do? Best place to order new fuel cap?
#2
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independent Jag shop loaned me one of theirs. I also pointed out how the cap was magnetic and the testing place had something that was not.
BUT I suspect what really helped was the guys doing the testing recognized the car and me for round 2 and let it slide as the car was came up great for everything else
BUT I suspect what really helped was the guys doing the testing recognized the car and me for round 2 and let it slide as the car was came up great for everything else
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#6
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Same problem here. I replaced my solenoid purge valve (getting the P0442 code) and purchased a new cap. I didn't put the new cap on and handed the new cap to the technician. When I got my paperwork back, it said "fuel cap N/A" as opposed to fail.
I think their equipment is way to sensitive and throws out gas caps as a catch all.
I think their equipment is way to sensitive and throws out gas caps as a catch all.
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MRomanik (09-27-2013)
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#8
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Not sure how it would work on these cars, but I had a friend run his Ford van on a near-empty tank on a couple of gallons of methanol, just for the test (it passed).
It wouldn't do your engine any favors if you drove around on pure methanol, but it may burn clean enough to get you by the test.
It wouldn't do your engine any favors if you drove around on pure methanol, but it may burn clean enough to get you by the test.
#9
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My 2005 also failed the cap test, purchased a new cap from the dealer - $37 - which passed. Step price, but the two recommended online sites for our caps were sold out, so I assume this is a very common problem. It will be interesting to see how it does in two years (the emissions test frequency here in Colorado). My suspicion with the cap is the retainer which has a ring around the cap so the cap can rotate within the retainer, perhaps that is not providing adequate seal on the test equipment which of course has to be generic.
Last edited by theweeb; 09-29-2013 at 09:08 AM.
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