Mixing tube for Solex carburetor. Porsche 356 / 912

Mixing tube for Solex carburetor.
The carburetor mixing tube (often marked "pipe - no. 25" on diagrams) is used in classic Porsche 356/912 models equipped with Solex carburetors. This tube routes metered fuel or air within the carburettor body and ensures correct mixture distribution, consistent flow and reliable performance. It is manufactured to replicate the original shape, diameter, and material specifications, allowing for direct replacement without the need for modification.
Sold each, 2 required per vehicle.

Fits:
Porsche 356 / 356A 1959 - 1959 with Engine code: 6922
Porsche  356B / 356C  (Model: 1600 S90/SC, CARRERA, 587/1 692/3A)  1960-1965
Porsche 912 1.6L 1965 - 1969  (Engine code:  616/36/37)
Porsche 912 1.6L 1965 - 1969  (Engine code: 616/39/40)

Diagram ref no 37

•  Part Number: 61610090703 (replaces 61610090702)
•  Function: Routes metered fuel/air within the carburettor body; ensures correct mixture delivery
•  Position: Engine induction system – inside carburettor body / fuel pipe assembly
•  Benefits: OE-geometry bore, direct fit, restores correct fuel flow path, upgrade over superseded part

Over time, the carburetor mixing tube experiences continuous exposure to fuel vapors, vibration, and temperature cycling. These conditions can gradually cause wear, corrosion, or slight deformation of the internal passage, leading to poor fuel atomization and inconsistent mixture delivery between cylinders. Even small changes in the tube’s inner diameter or alignment can affect throttle response and idle smoothness.

Replace this tube when:
• Performing a carburetor rebuild or restoration of a Porsche 356, 912, or early 911
• The existing tube is corroded, blocked, cracked, or showing pitting inside the bore
• You observe uneven fuel mixture, hesitation, or rough idling during engine operation
• Upgrading or replacing other induction components (jets, floats, shafts) to restore OEM precision.

Replacing the worn tube with a new ensures consistent fuel metering, proper mixture balance, and reliable carburetor performance — critical for maintaining smooth drivability and authentic response in classic Porsche engines.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

61610090703

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