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Fuel fill overflow- Where does it go? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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YOUR RESEARCHFuel fill overflow- Where does it go? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Leading reported evidence

Fill neck and spilled over

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Suggestion · Original poster

I removed the nozzle, and it kept filling the neck and spilled over.

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Fuel fill overflow- Where does it go? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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Leading evidence: 'Fill neck and spilled over' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Fill neck and spilled over' (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.

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1 matching discussions · 3 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

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Fill neck and spilled over

No successful repair reported for this finding.

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Reported fixes
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Unsuccessful attempts
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Discussions that contain suggestions
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0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

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Suggestion · Original poster

I removed the nozzle, and it kept filling the neck and spilled over.

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Fuel fill overflow- Where does it go? - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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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.

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

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POST 1 / ORIGINAL POSTEROriginal post

I just topped off my tank, and several ounces spilled over and drained through the hole adjacent to the filler neck. I figured I would have left a puddle on the ground, but nothing. Where does that fuel go? Is my drain line clogged?

POST 2Original post

For years fuel fills have been designed with vapor recovery systems and with what are called vapor space by the SAE at the top of the fuel tank. Topping off tends to drive fuel into the vapor recovery system and can result in damage that can get expensive. The automatic shutoff point of the fuel nozzle is dictated by the engineers and the standards bodies (NIST and SAE). A diagram of the fuel system is available in the parts listing (formerly called the PET) at https://assets-v2.porsche.com/us/-/media/Project/PCOM/SharedSite/PorscheClassic/Original-Parts-Catalogue/PDF-EN-US/KAT520_USA_986_04_KATALOG under Main Group 2 fuel system Your carbon canister may be damaged by repeated overfilling.

POST 3 / ORIGINAL POSTEROriginal post

Thanks for the reply. I didn't squeeze it again after it shut off. I removed the nozzle, and it kept filling the neck and spilled over. I guess I was expecting what I'd see on my motorcycle (small fuel puddle).

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