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Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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7 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHBoxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Leading reported evidence

Replace filter,bench

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

Drained the fuel and replaced the filter,bench tested the pump worked fine.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed work

Check voltage

No successful repair reported for this finding.

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Reported fixes
0
Unsuccessful attempts
1
Discussions
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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

I'd starting by tracing the wiring and check for voltage.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Read full discussion summary

Leading evidence: 'Replace filter,bench' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check voltage' (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 · 7 captured posts examined · 0 partial discussions

Compare 4 other evidence results

Test pump worked fine

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

Drained the fuel and replaced the filter,bench tested the pump worked fine.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Check voltage

Suggestion or failed attempt

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 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

I'd starting by tracing the wiring and check for voltage.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Clean fuel system

Suggestion or failed attempt

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 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

I started by cleaning the fuel system.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Repair & reprogramming or replacement

Suggestion or failed attempt

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 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

Needs ECU/immobilizer repair & reprogramming or replacement.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners
Frequently discussed actions (8)

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

Check voltage

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

I'd starting by tracing the wiring and check for voltage.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Clean fuel system

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

I started by cleaning the fuel system.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Repair & reprogramming or replacement

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

Needs ECU/immobilizer repair & reprogramming or replacement.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Replace filter,bench

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

Drained the fuel and replaced the filter,bench tested the pump worked fine.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run but only between 4 & 5 thousand rpm

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

We got it running but only between 4 & 5 thousand rpm.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run pump

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

Also worth scanning it, since an immobilizer issue or no crank sensor RPM signal can stop the DME from running the pump.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Test pump worked fine

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

Drained the fuel and replaced the filter,bench tested the pump worked fine.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Use jumper wire

No successful repair reported for this finding.

0
Reported fixes
1
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that report an unsuccessful attempt
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.

Unsuccessful attempt · Original poster

Fuses ok used a jumper wire on the fuel pump relay pump still not running.

Original post Read captured discussion
Boxster fuel pump not working - 986 Forum - The Community for Porsche Boxster & Cayman Owners
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.

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

  • 986Forum: 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: 20261026T065735Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I purchased a barn find 99 boxster. We got it running but only between 4 & 5 thousand rpm. We trailered it back to my shop. I started by cleaning the fuel system. Drained the fuel and replaced the filter,bench tested the pump worked fine. Put everything back together, would not start no fuel going to the filter pump not running. Fuses ok used a jumper wire on the fuel pump relay pump still not running. any ideas. Thanks Bob

POST 2Original post

I'd starting by tracing the wiring and check for voltage. Is there 12v at the pump? relay? fuse? etc.

POST 3 / ORIGINAL POSTEROriginal post

Thank you. I have done all that.

POST 4 / ORIGINAL POSTEROriginal post

does the computer under the driver's seat control electrical to the fuel pump. Thanks Bob L.

POST 5Original post

The box under the seat is the Immobilizer. A wet, failed unit causes no-start conditions, remotes not working, windows or locks not working, alarm going off randomly, etc… Needs ECU/immobilizer repair & reprogramming or replacement. There’s a lot written here about it and elsewhere.

POST 7Original post

If the pump bench-tests good, I would check for 12V and a solid ground right at the pump connector while cranking. If you jumpered the relay and still got nothing, either the jumper pins aren’t correct or there is no power feed to the relay/pump circuit. Also worth scanning it, since an immobilizer issue or no crank sensor RPM signal can stop the DME from running the pump.

This is a source reference. Confirm exact model applicability in the original material.