1968 – 1979 VW 1600 Transporter Carburettor

The Volkswagen fuel system is conventional in principle. A fuel tank is mounted in front of the engine and fuel is fed to the carburetor by a mechanically operated diagprahm pump which is drived by a pushrod actuated by a cam on the distributor drive shaft. The carburettor is a fixed single choke downdraught type which incorporates a strangler, electrically operated, and an accelerator pump of the diapraghm type. The feed from the accelerator pump can also be operate as a subsidiary fuel supply jet under certain conditions. With the automatic choke a diapraghm operated pushrod overrides the choke spring slightly as soon as there is vacuum on the engine side of the throttle flap.

Another device fitted to the carburetor is an electromagnetic cut-off valve which positively stops fuel from flowing into the inlet manifold. This is necessary because in certain high temperature conditions an over-heated engine can continue running on after the ignition is switched off.

1968 – 1979 VW 1600 Transporter Solex Carburettor

The carburettor is basically a tube through which air is drawn into the engine by the action of the pistons and en route fuel is introduced into the air stream in the tube due to the fact that the air pressure is lowered when drawn through the ‘tube’. A scent spray works on the same principle.

The main fuel discharge point is situated in the ‘tube’ – choke is the proper name for the tube to be used from now on – between two flaps which can block off the tube. One of these is the throttle flap – operated by the accelerator pedal and positioned at the engine end of the choke tube. The other is the strangler – which is operated by an automatic device.

1968 – 1979 VW 1600 Transporter Diagrammatic Cross Section of Solex 30 Carburettor with Air By Pass Adjustment

1968 - 1979 VW 1600 Transporter Diagrammatic Cross Section of Solex 30 Carburettor with Air By Pass Adjustment

1. By pass air/fuel mixing chamber
2. Choke tube
3. By pass air adjustment screw
4. Volume control screw
5. By pass air drilling

 

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