4A
Chapter 4 Part A:
Fuel system - carburettor engines
General
System type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Rear-mounted fuel tank, electric or mechanical fuel pump, single or
twin SU variable choke carburettor
Carburettor data
Mini 850 Saloon and variants, 848 cc, (85H) 1969-72 1972-74 1974-76 1976 on
Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SU HS2 SU HS2 SU HS4 SU HS4
Piston spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Red Red Red Red
Jet size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 mm 2.3 mm 2.3 mm 2.3 mm
Needle:
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . EB AAV ABS ADH
Rich . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M - - -
Weak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GG - - -
Idle mixture CO % . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 3.5 to 4.5 3.5 to 4.5 3.0 to 4.5
Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 rpm 800 rpm 800 rpm 750 rpm
Fast idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 rpm 1200 rpm 1200 rpm 1200 rpm
Mini Clubman and Mini 1000 Saloon and variants, manual transmission, 998 cc, (99H), up to 1974
1969-72 1972-74
Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SU HS2 SU HS2
Piston spring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Red Red
Jet size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 mm 2.3 mm
Needle:
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GX AAV
Rich . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . M -
Weak . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GG -
Idle mixture CO % . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . - 3.5 to 4.5
Idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 rpm 800 rpm
Fast idle speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900 rpm 1200 rpm
Accelerator cable - removal and refitting . . . . . . . . . . . . . . . . . . . . . 3
Accelerator pedal - removal and refitting . . . . . . . . . . . . . . . . . . . . . 4
Air cleaner assembly - removal and refitting . . . . . . . . . . . . . . . . . . . 2
Air cleaner element renewal . . . . . . . . . . . . . . . . . . . . . .See Chapter 1
Anti-run-on valve (1990-on Cooper models) - removal and refitting . 17
Carburettor - general information . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Carburettor - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Carburettor (SU HIF44 and HIF38)) - fault diagnosis and overhaul . . 14
Carburettor (SU HIF44 and HIF38) - idle speed and mixture
adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Carburettor (SU HS2 and HS4) - fault diagnosis and overhaul . . . . . 13
Carburettor (SU HS2 and HS4) - idle speed and mixture adjustment 15
Choke cable - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electric fuel pump - testing, removal and refitting . . . . . . . . . . . . . . . 6
Fuel gauge sender unit - removal and refitting . . . . . . . . . . . . . . . . . 8
Fuel system components, checks and lubrication . . . . .See Chapter 1
Fuel tank - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
General information and precautions . . . . . . . . . . . . . . . . . . . . . . . . 1
Inlet manifold - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mechanical fuel pump - testing, removal and refitting . . . . . . . . . . . 7
Underbody and fuel/brake line check . . . . . . . . . . . . . . .See Chapter 1
Underbonnet check for fluid leaks and hose condition . .See Chapter 1
Unleaded petrol - general information and usage . . . . . . . . . . . . . . . 10
4A•1
Specifications
Contents
Easy, suitable for
novice with little
experience
Fairly easy, suitable
for beginner with
some experience
Fairly difficult,
suitable for competent
DIY mechanic
Difficult, suitable for
experienced DIY
mechanic
Very difficult,
suitable for expert DIY
or professional
Degrees of difficulty
5
4
3
2
1
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