Fiat Bravo Service Manual page 392

Bravo '§!> *<*
Engine
Fuel system
10.
)Fl,lAlTl
If in the 1 st test (see previous page) the pres­
sure value was more than three bar it is nec­
essary to:
- disconnect the fuel return pipe (at the con­
nection point (1) with the rigid fuel return
pipe to the electric pump) and place it in a
suitable container for collecting the fuel.
- place both taps A and B in the open posi­
tion;
- operate the electric pump with the engine
switched off, as described on the previous
page, then read off the value reached on
the pressure gauge:
a. if it reaches 3 bar, check the fuel return
pipe to the tank because it is obstructed
or bent;
b. if it exceeds 3 bar, then the pressure reg­
ulator must be replaced because it is de­
fective.
3rd Test
Checking injectors seal
To check whether the injectors are dripping,
simply implement the connections for the 1 st
test (checking regulation pressure), then op­
erate the electric pump with the engine
switched off. When the regulation pressure is
reached, close the control lever B and, at the
same time, restrict the fuel return pipe to the
tank; a pair of pliers should be used so as not
to damage the pipe.
This operation is necessary to distinguish be­
tween a real leak from the injectors and the
imperfect seal of the fuel pressure regulator
flow valve.
Then:
- switch off the electric pump;
- observe whether the pressure remains constant for around 60 seconds as soon as it stabilizes (i.e. de­
creases slightly).
If this is not the case, there is a leak from one or more injector or from a union.
- If this is the case, remove the fuel manifold from the inlet manifold, keeping the connection with the
pressure guage.
- Repeat the previous test leaving the pressure gauge tap open.
- After having operated the electric pump with the engine switched off, visually inspect for drips from
the injectors or from any connecting sections.
Replace any injector which is dripping and/or renew the defective seal which is leaking.
Copyright by Fiat Auto 41