That's the accelerator pump as fitted the Chandler Groves (Ford 91/99) I have been rebuilding, the other holes are supposed to be used at high altitudes/ hot weather and in cold weather, the hole further in ( closer to the throttle valve shaft ) will displace the piston less for high altitude / very hot weather...and visa versa.
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Alastair
Lincoln, UK.
Under Restoration:
1944 No2 MK2 Loyd Carrier - Tracked Towing
1944 Ford WOT6 Lorry
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