SU Carburetor Lift Pins – Old vs. New Designs Explained! @Greeves
SU Carburetor Lift Pins – Old vs. New Designs Explained!  @Greeves
Uploaded March 2025 | Updated September 2026, 1 week ago
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Rebuilding SU carburetors? Let's take a deep dive into lift pins! In this video, we explore the differences between older and newer SU carburetor lift pin designs, their assembly, and the importance of sealing washers to prevent vacuum leaks. Whether you're restoring a classic car or tuning your SUs for peak performance, understanding these small but crucial components can make all the difference. Watch as we break down the details, compare diagrams, and select the best parts for a proper rebuild. Subscribe for more classic car tech! #ClassicCars #SUCarburetor #carrestoration

Refurbishing my carbs it's evident that they've been swapped over the years. One had an 'external spring' lift pin, the other internal. Turns out that there are (at least) 3 types of lift pins that have been fitted on these caburettors over the years.

These particular carbs are from a Daimler 2.5 litre V8 & are semi-downdraught SU HD6 x 2 but the piston lift pins feature on virtually all SU carbs. The part rumber for the rubber seals is AUC 4943 & are available from Burlen Fuel Systems sucarb.co.uk/shop.
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SU Carburetor Lift Pins – Old vs. New Designs Explained!

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