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FUEL PRESSURE REGULATOR
The pressure regulator is located a t the back o f t h e
t h r o t t l e body. The regulator m a i n t a i n s fuel pressure
a t constant 100 k P a (14.5 psi) across t h e fuel injector
t i p . W h e n t h e fuel p u m p is operational, fuel flows
past t h e injectors i n t o t h e pressure regulator. T h e
fuel r e t u r n port i s blocked b y t h e a spring loaded
rubber d i a p h r a g m
( F i g . 22). W h e n fuel
pressure
reaches 100 k P a (14.5 psi) i t pushes t h e d i a p h r a g m
away f r o m
t h e fuel
r e t u r n port a n d fuel
flows
t h r o u g h t h e r e t u r n l i n e to t h e fuel t a n k . T h e dia-
p h r a g m is constantly m o v i n g from t h e open t o closed
position t o keep fuel pressure constant.
Fig. 22 Fuel Pressure Regulator Operation
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