EVAP Leak Sources

DamienH

New member
2005 Z4 E85 w/ 2.5i

This car has had an issue with the p0442 'Minor Evap Leak' for around 6-8 months now. I'm completely out of educated guesses on what it'll take to fix it. Literally, to no exaggeration, the entire fuel & evap systems have been re-built. All new parts. All strictly OEM.

New fuel tank. New fuel pump. New main fuel hose gaskets. New fuel pressure regulator & filter. Injectors cleaned. New DMTL pump. New Gas cap. New charcoal vapor canister. New purge valve. New intake boots. New MAF.

Both fuel & evap systems pressure+smoke tested AND vacuum tested on multiple occasions. No discernable faults.

The goddamn car is still convinced that it has a fuel leak somewhere. Honestly, what else am I supposed to look at to get rid of this code?

Is there a way to change the computer to accept different criteria and trick it into thinking there's no error? I cannot register the goddamn car until this issue is sorted and I'm done spending money on new parts and tests....
 
You might try searching on the "E46 Fanatics" forum too. The M54 engines in E85 and E46 platforms are very similar in installation, and because there are so many more E46's, you might get some good ideas. Good luck !
 
Just a thought - have you tried disconnecting the battery for a while and then reconnecting or even try a different non supermarket fuel, make sure fuel cap is tight and rubber not perished. Who knows could be something simple.
 
I did a quick search on E46 "P0442 code" threads. One item mentioned was the hose end attached to the charcoal canister - the contributor noted that on his car the hose was multi-layer and the lining took a set that made the seal poor even though the hose was firmly on the canister.
 
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