Pump jet (GP) 50 for Solex 40 PII-4 carburetor. Porsche 356 / 912

Pump jet (GP) 50 for Solex 40 PII-4 carburetor. 
This jet controls the volume of fuel delivered under pump or transition circuits, ensuring correct mixture strength during acceleration or high-demand engine conditions. By matching the original dimensions, flow bore and material characteristics, this replacement part maintains factory-style calibration and helps ensure consistent drivability and fuel metering.
Sold each, 4 required per vehicle.

Fits:
Porsche 356 (Model: CARRERA 1600 GS/GT, 6922) 1950 - 1959
Porsche 356 (Model: CARRERA 1500 GS/GT,  40 PII-4) 1950 - 1959
Porsche  356B / 356C  (Model: 1600 S90/SC, CARRERA, 587/1 692/3A)  1960-1965
Porsche 912 1.6L 1965 - 1968  (Engine code:  616/36/37)

Diagram ref no 16

•  Function: Regulates fuel flow through the pump / transition circuit in the carburetor
•  Position: Within the carburetor body, pump / high-demand fuel circuit

Over time, metering jets like the pump jet may suffer from erosion, corrosion, or deformation, especially due to fuel additives or long‐term use. A worn or mis-sized jet can lead to rich/lean conditions, hesitation, flat spots during acceleration, or unstable mixture transitions.

Replace this jet when:
•   You are performing a full carburetor rebuild or overhaul
•   Your engine shows hesitation, poor acceleration or throttle flat spots
•   The original jet is missing, damaged, or shows signs of internal wear.
•   You want to restore factory-correct fuel metering for reliable classic Porsche performance.

Installing a new Pump Jet ensures accurate fuel delivery, consistent mixture behaviour and helps maintain the authentic feel and smooth acceleration of your classic Porsche.

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Related, superseded, cross reference or alternative numbers for comparison.

61610093600

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