A while back I started the thread below. I was getting a "Check Engine" light, and wanted to get a scan tool to read it. I bought a Foxwell, and it gave me a P0456 Code. "Evaporative Emission System Small Leak Detected".
I cleared it with the reader, and life went on. A couple of weeks later the exact same code reappeared. I did a little research, and found out that a lot of these "Slight Leak" codes get thrown by these "Capless Fuel Systems" getting dirty.
My 2015 Jeep Grand Cherokee is one of them. As it turns out, small amounts of dust, gunk, and crap can accumulate over time, in and around the gates, trap doors, and seals that make up these unnecessarily complicated things.
If they don't seal properly, you'll get the above code in many cases. There are several Youtube videos on this problem, because it's so common. The fix is really simple. You wipe out any visible dirt or dust that has accumulated around the filler port. (I used a rag saturated with Denatured Alcohol).
Then spray the lube of your choice around the opening. Some guys use a silicone based spray. Others like myself used LPS Pre-Solve, or else plain old WD-40 will also work just as well. (Because a small amount of this will likely get into the fuel tank, I wanted to use a combustible solvent).
Then, while using the funnel that all new cars are supplied with in order to add fuel to this overly complex system should you run out, you push it in, and pull it out several times while spraying. This allows the solvent to work it's way into the gates and seals, while flushing out any dust or particulate contamination that can cause these slight leaks which throw these codes.
We're not talking about large amounts of dirt here. So it's not like you're running the risk of clogging up your fuel system. (That's what fuel filters are for). Anyway, it appears to have worked well! I cleared the code once again after I did this about a month ago, and the "Check Engine" light has stayed out thus far.
I just thought I would put this out there for anyone who has one of these type of fuel filler systems, and has experienced the same thing. I'm going to start doing this at every oil change, as a regular maintenance procedure. Funny how I never had to "maintain" a gas cap.
I cleared it with the reader, and life went on. A couple of weeks later the exact same code reappeared. I did a little research, and found out that a lot of these "Slight Leak" codes get thrown by these "Capless Fuel Systems" getting dirty.
My 2015 Jeep Grand Cherokee is one of them. As it turns out, small amounts of dust, gunk, and crap can accumulate over time, in and around the gates, trap doors, and seals that make up these unnecessarily complicated things.
If they don't seal properly, you'll get the above code in many cases. There are several Youtube videos on this problem, because it's so common. The fix is really simple. You wipe out any visible dirt or dust that has accumulated around the filler port. (I used a rag saturated with Denatured Alcohol).
Then spray the lube of your choice around the opening. Some guys use a silicone based spray. Others like myself used LPS Pre-Solve, or else plain old WD-40 will also work just as well. (Because a small amount of this will likely get into the fuel tank, I wanted to use a combustible solvent).
Then, while using the funnel that all new cars are supplied with in order to add fuel to this overly complex system should you run out, you push it in, and pull it out several times while spraying. This allows the solvent to work it's way into the gates and seals, while flushing out any dust or particulate contamination that can cause these slight leaks which throw these codes.
We're not talking about large amounts of dirt here. So it's not like you're running the risk of clogging up your fuel system. (That's what fuel filters are for). Anyway, it appears to have worked well! I cleared the code once again after I did this about a month ago, and the "Check Engine" light has stayed out thus far.
I just thought I would put this out there for anyone who has one of these type of fuel filler systems, and has experienced the same thing. I'm going to start doing this at every oil change, as a regular maintenance procedure. Funny how I never had to "maintain" a gas cap.
How Much Should I Spend On A OBD Code Reader ?
I've been wanting to get one of these for a while, but I keep putting it off. This morning my Jeep was showing a MIL, (Malfunction Indicator Light). But the vehicle operated perfectly normally. The manual said to see if the light goes out on it's own after a few, "driving cycles". They mention...
bobistheoilguy.com
