Page 205 - Automobile Mechanical and Electrical Systems Automotive Technology Vehicle Maintenance and Repair (Vehicle Maintenance Repr Nv2) by Tom Denton

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Engine systems 189

Figure 2.220 Carburettor

Figure 2.221 New petrol/gasoline injection system

2.5 Fuel systems

2.5.1 Introduction

Fuel systems have been extensively developed during the past fi fty years. There
were many developments in the traditional petrol supply and air mixing methods
used in carburettors ( Fig. 2.220 ). However, the introduction of fuel injection Key fact
systems has made carburettors almost obsolete. Fuel injection is now fi tted to The introduction of fuel injection
all petrol engine vehicles to meet the latest requirements for performance and systems has made carburettors
the reduction of harmful exhaust gas emissions ( Fig. 2.221 ). Diesel fuel pumps almost obsolete.
and injectors have seen similar developments with the introduction of electronic
control and common rail systems ( Fig. 2.222 ).
All fuel delivery systems have to supply a quantity of fuel that matches the
amount of oxygen that is in the air entering the engine. For petrol engine