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will faulty crank sensor shut off fuel pump? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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YOUR RESEARCHwill faulty crank sensor shut off fuel pump? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Check fuel rail again and still nothing

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Performed · outcome unconfirmed
Then I put ignition to on and checked the fuel rail again and still nothing.
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will faulty crank sensor shut off fuel pump? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

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Leading evidence: 'Check fuel rail again and still nothing' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check fuel rail again and still nothing' (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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Run on purpose

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Suggestion
Yes, but only if the static fuel pressure is low; otherwise it does not run which is why you have to pull the relay and jumper the system to make it run on purpose for testing.
Original post Read captured discussion
will faulty crank sensor shut off fuel pump? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run when you put the key in the

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Suggestion
But doesn't the fuel pump run when you put the key in the on position (not the position to start the car) ?
Original post Read captured discussion
will faulty crank sensor shut off fuel pump? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Test light

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Suggestion
I hooked up a test light to the #30 slot and there was power so I assume power is going to the pump and it is not working.
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will faulty crank sensor shut off fuel pump? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Frequently discussed actions (4)

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Check fuel rail again and still nothing

No successful repair reported for this finding.

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Discussions that performed work without a confirmed outcome: 1

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Performed · outcome unconfirmed
Then I put ignition to on and checked the fuel rail again and still nothing.
Original post Read captured discussion
will faulty crank sensor shut off fuel pump? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run on purpose

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.

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Suggestion
Yes, but only if the static fuel pressure is low; otherwise it does not run which is why you have to pull the relay and jumper the system to make it run on purpose for testing.
Original post Read captured discussion
will faulty crank sensor shut off fuel pump? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Run when you put the key in the

No successful repair reported for this finding.

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Reported fixes: 0
Unsuccessful attempts: 1
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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.

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Suggestion
But doesn't the fuel pump run when you put the key in the on position (not the position to start the car) ?
Original post Read captured discussion
will faulty crank sensor shut off fuel pump? - 986 Forum - The Community for Porsche Boxster & Cayman Owners

Test light

No successful repair reported for this finding.

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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 hooked up a test light to the #30 slot and there was power so I assume power is going to the pump and it is not working.
Original post Read captured discussion
will faulty crank sensor shut off fuel pump? - 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.

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

986Forum: 1 discussions

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Generation: 20261027T000231Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

hi all, removed whole exhaust tonight to fit new gaskets, clamps and brackets. while exhaust was off i started it and revved it a few times, it then died. fuel pump not running, fuse, relay and pump ok, am i right in saying the crank sensor can shut down the fuel pump? anythink else that can shut it down? car cranks fine with no untoward noises, i figured the noise created by revving it with no exhaust on has killed something, thanks barks

POST 2Original post

Yes..........................

POST 3 / ORIGINAL POSTEROriginal post

thankyou :-) barks

POST 4Original post

When the CPS fails, I think the ECU 'thinks' the engine is not rotating. Therefore there is no need for any fuel.Therefore the fuel pump relay gets no signal. CPS is not very expensive. About $90 in USA. The part number for mine(but verify for yours) is: BOSCH - 0261210204

POST 5Original post

Quotes source post: 456421

But doesn't the fuel pump run when you put the key in the on position (not the position to start the car) ?

POST 6Original post

Quotes source post: 471693

Yes, but only if the static fuel pressure is low; otherwise it does not run which is why you have to pull the relay and jumper the system to make it run on purpose for testing.

POST 7Original post

so I checked fuel pressure at rail by depressing shrader valve and got nothing. Then I put ignition to on and checked the fuel rail again and still nothing. You're saying it can still be the CPS and the only way to tell is to jumper the system and see if getting pressure by fuel rail?

POST 8Original post

Quotes source post: 471695

Possible, but if you pull the fuel pump relay and jumper the pump (do a search for procedures) and still get no pressure, you have a pump issue as this bypasses the CPS.

POST 9Original post

Quotes source post: 471695

The valve can be awkward to operate.It is an unusual size. If there is zero residual pressure in the system & the pump does not run with key "on" Then the fuel pump electrical system is suspect. Easy to test.

POST 10Original post

Quotes source post: 471697

Is this definite? I jumpered the pump and there was still no fuel pressure. I hooked up a test light to the #30 slot and there was power so I assume power is going to the pump and it is not working. Am I correct and does that mean it is definitely the pump? Thanks

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