10 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHHmmm...what's that hum?
Leading reported evidence
Replace gas cap
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
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1
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Performed · outcome unconfirmed · Original poster
I removed and replaced the gas cap, but I didn't hear any burpping noise.
Leading evidence: 'Replace gas cap' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace gas cap' (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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Suggestion
Being in Florida, my Rad fans run a lot...more of a whooshing sound.
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Suggestion
When they run on high, it sounds like a jet fighter waiting for take off if you get out and walk around the front of the car.
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.
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Suggestion
Rad fan running on low after hwy driving then urban stop and go
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.
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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.
10 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: 20261026T142254Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
As I returned from a 4 hour hwy. trip and slowed/stopped for some suburban stop lights, I discerned a constant, high frequency humming sound (female voice range?) that seemed to emanate from the front of my beloved '99 996 (66K miles). So I experimented a bit to isolate the source; (a) it is unaffected by road speed or rpm, (b) it is unrelated to HVAC fan settings.
Upon arrival at home, I pulled into the garage, left the engine running, and opened the frunk and engine lid. Then I walked slowly around the car listening for the likely source.
The hum was nearly inaudible at the rear of the car.
The hum did not sound noticeably louder in the frunk area, compared to inside the car...about the same.
The hum was definitely loudest in the area behind the right front wheel...in the fender well area.
My first suspicion is the electric fuel pump. But...your thoughts will be appreciated.
relinuca
I vote for:
1. Rad fan running on low after hwy driving then urban stop and go
2. Fuel pump
3. Fuel evap system
Being in Florida, my Rad fans run a lot...more of a whooshing sound. When they run on high, it sounds like a jet fighter waiting for take off if you get out and walk around the front of the car. Kinda cool sounding. Maybe you have something stuck in the fan (leaf) or a bad fan bearing. Otherwise, I would burp the fuel system (remove cap and put it back on). Did you refuel? Overfilling might have gotten some liquid fuel in the evap canister and it is purging. After a couple of runs it might just go away.
I removed and replaced the gas cap, but I didn't hear any burpping noise. But the humming now sounds much fainter; maybe its my imagination, though.
Is there any diagnostic for assessing the health of an aged fuel pump? If not, I may just have it replaced as a "piece of mind" thing.
In the world of "pay me now, or pay me later", I'm a pay me now kind of person.
relinuca
This is a source reference. Confirm exact model applicability in the original material.
