Permatex 82099 Spray Sealant

16 Month Update: Code never came back. This product sealed the vacuum leak - which had been plaguing me for years. ************* For a long time I had been having an intermittent check engine code that relates to the evap emissions test part of the OBDII on my 2005 Mercedes C230. It does not affect the operation of the vehicle or the engine. It just means there is a small vacuum leak when the system tests itself which throws the code. Consequently you can’t get your car smogged or registered. I read in various places that this is a common problem with this vehicle and even watched YouTube videos of people addressing repairs etc. I learned thanks to all this information (!) that there is a specific spot close to and just behind where the fuel filler opening is located. The part includes a plastic barb which a hose connects to. The barb develops a hairline crack causing a “small evap leak” (P0456). Many people solved their issue by replacing the entire filler neck assembly, which can cost anywhere from $150 for a used part to $500 for a new part. Not to mention the 2-4 hours in labor. The vehicle has a rubber shroud directly behind the fuel inlet which you can push down with a flat screwdriver. You can see right in that location where the suspect part is located. I used the straw attachment and sprayed all over that area about 5-8 coats of this liquid Permatex. It sprays on like liquid and congeals into a nice rubber sealant after a few minutes. I have not had the P0456 code since using this spray sealant. Given the tight space limitations involved, there’s no way I could’ve made this repair using a different product. I would recommend this product for any low pressure (or vacuum) leaks. The straw sprayer is perfect so you can get into tight spaces. It seems particularly suited for things like what I accomplished - sealing a hose/barb fitting - a weak spot in any vacuum system.

ノズルを付けないと、拡散する。

yes the Permatex Spray Sealant is excellent have a great day

It stop a leak on a 5 speed manual transmission (NV4500) . It’s been 6 months now and still not leaking.( there is no pressure inside the transmission )

This worked well for time enough to tide me over. Not a permanent fix however.