P0455 code at 2/3 of a tank og gas

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Texas Bruce

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Aug 10, 2014
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Ram Year
2001
Engine
5.9 gas
Hi.
2001 Ram 2500 360 CDI I have received a P0455 code 3 times with 200 to 300 miles between each code. Each time I erased the code and did a complete inspection of my fuel tank purge system and find nothing lose, broken or wrong. Last week the code returned while I was on a trip and it occurred to me that each time I see this code it is happening at exactly 2/3rds of a tank. If I clear the code it does not return till after I have re-filled the tank and then drive it back down to two thirds of a tank. This could be a 3 times coincidence but I tink it is a pattern. Any one got any idea what I should be looking for. Thanks in advance for any help.
Bruce Buchanan
 

mda8569

Senior Member
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Dec 13, 2014
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Location
Vandalia Ohio
Ram Year
2001
Engine
5.9 magnum
Hey Bruce, I had same code, mine was the filler neck/vent tube had a crack in it. Hope that helps, Mike A.
 

newrammer

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Ram Year
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Engine
5.9 v8 magnum
I've got the same code and like you, have checked the gas cap area and nothing looks off. So will have to check my filler neck next I suppose.
 

mda8569

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2001
Engine
5.9 magnum
Rusty truck here in ohio. The vent tube has a brace that holds both tubes together, broke there from rust.
 
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