Code PO455 (gross leak)
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4wd Low
Joined: May 2020
Posts: 13
Likes: 1
From: Marietta
Code PO455 (gross leak)
2008 F150 5.4 Anniversary Edition. I am working to solve a code P0455 code that has been set on the truck. So far I have replaced the evaporative emission return tube, it was beginning to break down giving off a powdery substance. It did not solve the problem. I have replaced the vent valve and waiting for it to complete the cycle! My next step, should it not fix the problem, is to run a smoke test, I found out that my Son has a smoke machine I can use. My question is where do I introduce the smoke into the system? Thanks for your help!
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4wd Low
Joined: May 2020
Posts: 13
Likes: 1
From: Marietta
Yes, I replaced the gas cap! I hope I have it taken care of but want to be ready if the code returns. Thanks for the reply!
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4wd Low
Joined: May 2020
Posts: 13
Likes: 1
From: Marietta
I found the source of the problem without having to use the smoke! After filling the fuel tank up I noticed a fuel leak, I had not noticed a leak previously. Following the leak pattern I could tell it was coming from the fuel pump area and with the use of a mirror could see that the vent line fitting had a hole in it. Looked like a rodent had chewed it! Thanks for the replies.
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4wd Low
Joined: May 2020
Posts: 13
Likes: 1
From: Marietta
It wasn't the hose it was the fitting which was chewed, I have seen them chew rubber but not hard plastic except marine grade rubber coated nylon! You would not think they would bother with an every day driver.
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Fleet Owner
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That's worse because you have to change an expensive part instead of a low cost piece of hose. If they're going to chew, they should be more considerate in what they chose to chew. 
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4wd Low
Joined: May 2020
Posts: 13
Likes: 1
From: Marietta
Well it could have been worse, at least I didn't have to drop the tank or remove the bed!
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steve2003
1997 - 2003 F150
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May 28, 2020 08:35 AM