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Registered
Join Date: Jun 2019
Posts: 32
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New fuel cap - is this supposed to have vent?
My old fuel cap needs new seal so as car is having a referesh decided buy new. The new unit looks the same ad ols except it doesnt have a small hole/vent in the cap. Is this importsnt?
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10-09-2025, 03:27 AM
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PCA Member since 1988
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What year car?
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1973.5 911T with RoW 1980 SC CIS stroked to 3.2, 10:1 Mahle Sport p/c's, TBC exhaust ports, M1 cams, SSI's. RSR bushings & adj spring plates, Koni Sports, 21/26mm T-bars, stock swaybars, 16x7 Fuchs w Michelin Pilot Sport A/S 3+, 205/55-16 at all 4 corners. Cars are for driving. If you want art, get something you can hang on the wall! |
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10-09-2025, 11:26 PM
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Join Date: Jun 2019
Posts: 32
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1976 carrera 3.0 sc
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10-12-2025, 03:27 AM
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P/N 901 201 271 00 is the OE cap and doesn’t have any kind of vent. Not aware of any g-body with a vented cap.
1. Got a photo? 2. More importantly, is the tank breather in the frunk routed correctly? Wondering if this is some aftermarket cap used b/c the breather isn’t set up right.
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1978 911 SC (3.2SS, EFI, 993SS cams + the trimmings) Dynamic Comp Ratio calc: https://dcr.questionable.services/ • Gearset & Ratio calc: https://ratio.questionable.services/ |
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10-12-2025, 03:38 AM
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The fuel vent in my '75 is independent of the cap. There is a hose from the filler neck through the trunk and out the left front of the chassis behind the fender. I believe mine would have originally had a charcoal filter, but that's long gone.
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Chris '75 911s 3.2 - Ice Green Metallic ‘87 951, '05 987 S '21 Jeep Gladiator ‘18 Tesla ModelX 100D, ‘20 Model 3 |
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10-12-2025, 02:39 PM
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Registered
Join Date: Jun 2019
Posts: 32
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My cap looks nothing like 901 201 271 00... Its an old screw in type brass color
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10-14-2025, 07:50 AM
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Val
1975 Porsche 911s 3.2
