MG Midget 1979 Driver's Handbook Manual page 33

A LFU N CT IO N IDENTIFICATION
Check the following items regularly for visual signs of a malfunction and also
if any of the driving symptoms listed should persistently occur. If you are un~ble
to locate and/or correct the malfunction you are advised to contact your authorized
Austin MG Dealer immediately.
Emission Control Systems-Cal if ornia
Fuel To prevent air pollution by vapours from the fuel tank and the carburetter vents,
evaporative the control equipment stores the vapour in both of the charcoal-filled canisters
loss control
while the engine is stopped and disposes of it via the engine crankcase emission
control system when the engine is running.
The fuel tank venting is designed to ensure that no liquid fuel is carried to the
storage canisters with the vapours and that vapours are vented through the
control system.
The capacity of the fuel tank is limited by a specially positioned filler vent tube
and ensures sufficient volume is available after filling to accommodate fuel which
would otherwise be displaced as a result of a high temperature rise.
Warning: When filling with fuel do not attempt to add more than the capacity
given in 'GENERAL DATA'. Slow filling, or allowing the level to drop and then
add ing more fuel, is not recommended and can result in spillage due to expansion.
TH E LAYOUT OF THE FUEL EVAPORATIVE LOSS CONTROL SYSTEM
Visual checks
1. Condition and adjustment of drive belts.
2. Baked or overheated hose between air pump, diverter valve and chec k valve.
3. All hoses for security , damage and deterioration.
4. Fuel leakage.
5. Oil filler cap for sealing.
6. Fuel filler cap for sealing.
7. Catalytic converter warning light on.
7 ~j 81381J
Driving 1.
Violent backfire in exha ust system .
symptoms 2. Hesitation to accelerate on re-open ing the throttle after sudde n throttle
closure.
3. Engine surges (erratic operation at varyin g thrott le openings).
4. Engine idles erratically or stalls.
5. Noisy air pump.
6. Ignition warni ng light on above idle speed (slack or brok.en fa n belt).
7. Smell of fuel vapours.
8. Engine stops after short runnin ' period s (fuel starvation).
9. Lack of power.
10. Excessive fuel consumption.
11. Engine misfires (engine jerk s n cruise and acceleration) .
12. High temperature indicated (overheating f coo lant).
1. Primary charcoal adsor ption canister
2. Vapour lines
3. Purge line
4. Connecting pipe
5. Secondary charcoal adsorption canister
6. Restricted connection
7. Restrictor
8. Sealed oil filler cap
9. Oil separator/flame trap (arrester)
10. Fuel pipe
12. Running-on control valve
13. Sensing pipe
14. Running-on control hose
15. Air vent pipe
16. Fuel tank
17. Sealed fuel filler cap
18. Vapour line
19. Vapour tube
20. Capacity limiting tank
21. Separation tank