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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHWhere's a good link for testing fuel pressure?
Leading reported evidence
Replace along
Performed · outcome unconfirmed
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0
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1
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Read evidence and context
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Performed · outcome unconfirmed
I replaced along with 100 other parts during an elective rebuild.
Leading evidence: 'Replace along' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, the most frequently mentioned possible cause is 'good idea' (1 discussions; 0 report identifying it and 1 suggest it). The most frequently discussed action is 'Check i can bleed pressure off and remove the gauge' (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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Performed · outcome unconfirmed · Original poster
it was kind of deep and they needed extra threads so they used an air conditioner pressure gauge with deeper threading from Harbor freight.
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Suspected cause · Original poster
Probably a good idea to replace as long as you're depressurized.
Check i can bleed pressure off and remove the gauge
Suggestion or failed attempt
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Read evidence and context
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Suggestion
My gauge also has a bleeder valve so once I'm done checking I can bleed pressure off and remove the gauge with virtually no fuel spill..
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Suggestion
In some cases you use a interposed T, basically you disconnect the feed line,
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15 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T120458Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
Not all cars have the pressure port and its not consistent on the 996 near as I can tell.
In some cases you use a interposed T, basically you disconnect the feed line,
and a t goes in the feed line and rail that has a extra port for the gauge.
If your just testing the pump, it can be done on the gas tank end by disconnecting the
feed and hooking a gauge to the pump output. You only turn it on for 10 seconds to see peak pressure.
Oreillys has the gauge for rent, (free if you return it after use.. ) its their loaner tool program.
You may need to buy adapter fittings since the Porsche stuff is a bit unique.
Called O'Reilly's. They do have them. I read someone said it's a standard Schrader type valve access port. it was kind of deep and they needed extra threads so they used an air conditioner pressure gauge with deeper threading from Harbor freight. Should be passenger side on the fuel rail. Tried to do a search but didn't get any good hits.
The port is on the passenger side fuel rail near the middle and is covered by a brass cap.
It’s fairly easy to access.
You want 48psi while idling and 55psi when engine is shut off.
Yes, Shrader type. I don't know if it was bad or not. I replaced along with 100 other parts during an elective rebuild. You could say I got carried away
FWIW, I believe the Schrader in the fuel line is a "hydraulic" rated part, its o-ring is fuel rated.
That being said, when I check fuel pressure I remove the Schrader so my relatively large gauge gets a full volume
My gauge also has a bleeder valve so once I'm done checking I can bleed pressure off and remove the gauge with virtually no fuel spill..
I never remove a gauge from a hot motor whether the valve is in or not.. No car-be-que for me....
Good advice. I didn't know there was such thing as fuel rated Schrader valve. How do you find those? Probably a good idea to replace as long as you're depressurized. That O-ring can't last forever.
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