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COUPE
277
'49
50
51
Fig. 434 - Diagrammatic sections of Weber 30
Die
1 carburetor.
17. Bowl. - 41. Primary throat fuel delivery passage. - 42. Primary
throttle shaft cam. - 43. Accelerator pump control lever. - 44. Ac-
celerator pump diaphragm. - 45-46. Diaphragm springs (outer
and inner). - 47. Ball valve. - 48. Calibrated bushing .• 49. Pump
fuel recirculation passage. - SO. Pump jet. - 51. Delivery valve.
is passaged to discharge into the secondary throat
through idle transfer orifices.
The accelerator pump (fig. 434) ensures
smooth
acceleration of the engine when the throttles are
opened suddenly.
When the throttles are closed, the lever (43) is
released and the diaphragm (44) actuated by the
spring (46) causes fuel to be drawn from the bowl
(17) through the suction ball valve (47). When the
throttles are opened, the combined action of the
Fig. 435 - Carburetor viewed from the volume control screw end.
18. Main jets.• 22. Throttle stop screw. - 31. Idle jet. - 33. Volume
control screw. - 58. Strainer inspection plug.
cam (42) and lever (43) urges the diaphragm (44)
to inject fuel into the primary throat of the carburetor
via the passage (41), the delivery valve (51) and
the pump jet (50).
With wide open throttles, the
spring (45) will move the diaphragm (44) further
on, thus obtaining an additional amount of fuel to
be discharged into the primary throat.
Fuel delivered in excess by the accelerator pump
is recirculated to the bowl (17) through the passage
(49) and the calibrated bushing (48).
The easy starting device is controlled by a knob
on floor tunnel.
When the control knob is pulled out to its fullest
extent, the lever (55, fig. 433) shifts to the position
Fig. 436 - Inner view of carburetor body and cover.
10. Discharge tubes. - 11. Auxiliary Venturis. - 15. Emulsion tubes. - 18. Main jets. - 19. Float.• 51. Accelerator pump delivery valve.
52. Choke throttle valve. - 60. Fuel Inlet pipe connector.
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