Table of contents: Fuel tank ↓ Fuel pump ↓ Air filter ↓ Carburetor Solex 35 PDSIT ↓ Carburetor Solex 1B1 ↓
Fuel tank
The fuel tank is stamped from sheet steel and installed under the body bottom in front of the rear axle.
Fuel tank capacity, l: 68.
Fuel pump
The mechanical diaphragm fuel pump is driven by a camshaft eccentric located between the exhaust and intake valves of cylinder 1. Only the upper part of the fuel pump housing can be removed to access the mesh filter.
Brand: APG.
Fuel injection pressure at crankshaft speed of 2000 rpm, kg/cm²: 0.20.
Maximum fuel injection pressure, kg/cm²: 0.25.
Air filter
Air filter with air intake noise suppressor, with replaceable dry large-sized filter element, with incoming air heating depending on the outside temperature. Warm air is taken from the exhaust manifold.
Filter element brand: Volkswagen.
Frequency of cleaning the filter element: every 15,000 km.
Frequency of replacement of the filter element: every 30,000 km.
Carburetor Solex 35 PDSIT
Until October 1979, the engine was equipped with a Solex 35 POSIT carburetor. The carburetor is of the emulsion type, single-chamber, with primary and additional idle systems, providing idle speed adjustment without changing the throttle valve opening angle, with a power mode economizer and economizer, a diaphragm and other piston-type accelerator pump, an automatic starting device, and an electromagnetic shut-off valve of the idle system.
Calibration data
Diffuser diameter, mm: 27.
Main dosing system:
- fuel Jet Marking: X 137.5;
- emulsion tube marking: 145 Z.
Primary Idle System:
- fuel jet marking: 42.5;
- air jet marking: 120.
Additional idle system:
- fuel jet marking: 40;
- air jet marking: 104.
Needle valve hole diameter, mm: 1.5.
Thickness of the gasket under the needle valve, mm: 1.5.
Starting clearance of the air damper, mm: 4±0.2.
Starting clearance of the throttle valve, mm: 0.85±0.05.
Crankshaft speed at idle, rpm: 900-1000.
Carbon monoxide (CO) content in exhaust gases, %: 0.5-1.5.
Carburetor Solex 1B1
Since October 1979, the engine has been equipped with a Solex 1B1 carburetor. The carburetor is an emulsion type, single-chamber, with a power mode economizer, economizer, piston accelerator pump, automatic starting device and electromagnetic shut-off valve of the idle system.
Calibration data
Diffuser diameter, mm: 25.
Main dosing system:
- fuel Jet Marking: X 117.5;
- air jet marking: 95.
Idle system:
- fuel jet marking: 52.5;
- air jet diameter, mm: 1.30.
Econostat:
- fuel jet marking: 42.5;
- air jet marking: 120.
Height of the injection tube of the economizer enricher relative to the small diffuser, mm: 24.
Accelerator pump nozzle diameter, mm: 0.3.
Fuel supply by the accelerator pump for 10 cycles, cm³: 15±2.0.
Distance between float and float chamber plane mm: 27.
Needle valve hole diameter, mm: 1.5
Crankshaft speed at fast idle during engine warm-up, rpm: 4300-4700.
Starting clearance of the air damper, mm: 3.5±0.15.
Starting clearance of the throttle valve, mm: 0.8±0.05.
Crankshaft speed at idle, rpm: 900-1000.
Carbon monoxide (CO) content in exhaust gases. %: 0.5-1.5
This publication is borrowed from the resource: AudiManual