P0442

The Evaporative Emission Control System Leak code is back. Already replaced the gas cap and cleared the code, but it came back after a couple days. Did this twice now.
Any suggestions on where to look beyond the gas cap? TIA.
Joe '03 Dakota 5.9 R/T CC '93 Mustang 5.0 LX hatch with a few goodies
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Joe wrote:

Is the new cap aftermarket? Does the lip of the gas filler neck look damaged or rusted? Vapors are escaping...these vapors are routed through hoses, solenoid valve, and a leak detection pump. You can visually inspect the rubber vacuum hoses and plastic black lines under the hood (from the fuel tank) and under the vehicle for cracks and wear, also look at the Gas tank, return fuel lines and filler tube for signs of leaking fuel. You can have a smoke test performed at a shop, but with this code usually a thorough visual inspection will find the fault --J
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Yes.
Brand new OEM cap from dealer.

Not at all. Looks perfect. I even wiped it clean with a clean shop rag.

Thanks, will do.

This happened a while ago, and they did the smoke test and found the bad cap. Replaced it, problem gone for months. Now it's back. Replacing the cap with the new OEM unit from the dealer didn't help, so it's either a bad cap (unlikely?) or something else. I will check the hoses, etc.
Joe '03 Dakota 5.9 R/T CC '93 Mustang 5.0 LX hatch with a few goodies
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