Rennlist

Fuel vent valve check?

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Original source

1 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHFuel vent valve check?

Leading reported evidence

Replace fuel cap(o ring was very cracked

Performed · outcome unconfirmed

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster
I Have an emission code p0455, already checked and replaced the fuel cap(o ring was very cracked, reset the code, and a day or 2 later it came back.
Original post Read captured discussion
Fuel vent valve check?

Frequently discussed work

Check fuel line vent valve

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
Is there a decent way to check the fuel line vent valve?
Original post Read captured discussion
Fuel vent valve check?

Read full discussion summary

Leading evidence: 'Replace fuel cap(o ring was very cracked' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fuel line vent valve' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.

Source reports, not a diagnosis or a success probability. Counts refer to discussions and can overlap.

Read captured replies

1 matching discussions · 1 captured posts examined · 0 partial discussions

Compare 2 other evidence results

Check fuel line vent valve

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
Is there a decent way to check the fuel line vent valve?
Original post Read captured discussion
Fuel vent valve check?

Fill completely full.) and not seeing any damage

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
also takes a little bit to fill completely full.) and not seeing any damage to the hoses under here.
Original post Read captured discussion
Fuel vent valve check?

Frequently discussed actions (3)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check fuel line vent valve

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
Is there a decent way to check the fuel line vent valve?
Original post Read captured discussion
Fuel vent valve check?

Fill completely full.) and not seeing any damage

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that contain suggestions: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion · Original poster
also takes a little bit to fill completely full.) and not seeing any damage to the hoses under here.
Original post Read captured discussion
Fuel vent valve check?

Replace fuel cap(o ring was very cracked

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

Read evidence and context

Discussions that performed work without a confirmed outcome: 1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Performed · outcome unconfirmed · Original poster
I Have an emission code p0455, already checked and replaced the fuel cap(o ring was very cracked, reset the code, and a day or 2 later it came back.
Original post Read captured discussion
Fuel vent valve check?

Coverage and how to read this overview

Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.

1 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T105141Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Is there a decent way to check the fuel line vent valve? 1999 996 C2. I haven't come across a way yet. Should it only flow air one way, and not another or? I Have an emission code p0455, already checked and replaced the fuel cap(o ring was very cracked, reset the code, and a day or 2 later it came back. also takes a little bit to fill completely full.) and not seeing any damage to the hoses under here. I'd rather not just throw a hundred bucks at a new valve and have that not be the problem. But I'd like to fix it before I put it up for sale... no one likes the engine light on, even if it is because of a dumb emission code... And thankfully we have never had any of those silly vehicle inspections many of you guys have. so this stuff could be completely gone, and no one would ever complain.

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