D:01:14
Fuel Emission and Exhaust System
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m-si
PHI-KKIJHI-
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1 Fuel Pump Check Valve
2 Primary Circuit Seal
3 Control Pressure Circuit Seal
Fig. 16
REST PRESSURE
When the fuel pump is not operating, it is
necessary to retain fuel under pressure in all lines.
This "rest" pressure will prevent vapour from
forming in the lines and ensure instant re-starting.
When the fuel pump stops, a check valve (1) and
two seals (2
Et
3) close, sealing off the fuel return
lines to the tank. The accumulator will then
maintain pressure in the. system to prevent
vaporisation.
In addition to the check valves and seals, it is
important that the control plunger (b) returns to
the closed position,
all
injectors (a) close tightly,
cold start valve (c) closes tightly and all fuel
connections are tight and leak free. Fig.
16.
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