
This fuel overflow socket is a replacement for the original Porsche part 91120159300. It restores the proper connection between the filler sleeve and overflow / vent hose, ensuring safe fuel venting and leak-free performance.
Fits:
Porsche 911 1963 - 1989
Porsche 912 1965 - 1970
Diagram ref no 21
The overflow socket (or connector) attaches to the fuel filler neck / sleeve and provides a junction for the overflow / vent hose. It ensures that excess fuel or vapour is safely routed rather than spilling over or leaking onto chassis components. It maintains proper venting pressure and prevents fuel from escaping the system during refuelling or changes in tank pressure.
Location: Between the filler neck / sleeve and overflow / vent line in the fuel tank / filler assembly.
Why replacement matters
• With age, the original overflow socket can crack, become brittle, or warp, leading to fuel drips, leaks, or vapour escape.
• A failed connector can cause fuel to spill externally, create unpleasant odours, or allow venting to bypass the proper hose routing.
• Replacing ensures exact geometry, secure hose interface, durable fuel-resistant material, and a precise fit.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
91120159300
The product you are viewing cross references to these numbers
- Porsche 911 1965-1968 2.0L / 912 SWB (F)
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 911 1978-1983 3.0L / SC
- Porsche 911 1984-1986 3.2L
- Porsche 911 1987-1989 3.2L G50
- Porsche 911 1975-1977 3.0L Turbo (930)
- Porsche 911 1978-1989 3.3L Turbo (930)