Triumph TR7 - Fuel System and Injection

EMISSION AND EVAPORATIVE LOSS CONTROL SYSTEMS
4
Fig. 3 Main electronic fuel injection system compommu
Electronic Fuel Injection
In convenltonal carburener luel system engines. fuel mixes
with the aIr stream entering the engine combustIOn
chambers by means of fixed and/or van able Jets In the
carburetter(sJ Despite advances
In desIgn. the carburetter IS
not a totally efficient means 01 dispensing fuel lor all the
many and varIed engine operating conditions. parllcularly
when stringent e::o:haust emiSSion levels must be met For this
reason an electrOniC fuel Injection system IS fitted to these
models and carburetters are nOt used.
An electrOniC fuel Injection system comprises. as the name
suggests. 01 two parts:-
A fuel injection system and an electronic control for the fuel
injection system.
Key to Fig. 3
(AI Fuel Injector
(8) Fuel pressure regulator
(e) Extra AIr Valve
(D) Fuel
pump
(E) Air Flow Meter
IF) Electronic control
Unit
Should it be necessary to remove or exchange an injector, a
new sealing ring must be fined.