Fiat Bravo Service Manual page 206

Bravo-Brava ^
16v
Engine
Fuel system
10.
If pressure measured in test 1 (see pre­
vious page) exceeds 3 bars proceed as
follows:
- disconnect fuel return pipe (at point
(1) for connection to rigid fuel return
line to pump) and place in a container
suitable for collecting the fuel.
open cocks A and B;
operate the fuel pump with engine off
as described on previous page, then
take pressure reading off pressure
gauge:
a. if it reaches 3 bars replace the fuel re­
turn pipe to the tank because it is
blocked or kinked;
b. if it exceeds 3 bars replace the pres­
sure regulator because it is defective.
Test 3
Checking injector seal
To check for drips from the injectors,
connect as described in first test (regu­
lation pressure check) and then operate
the pump with the engine off. When the
regulation pressure is reached, close
control lever B and simultaneously con­
strict fuel return line to tank; use pliers
for this purpose and avoid damaging the
pipe.
This operation is necessary to discrimi­
nate between true loss from the injec­
tors and a faulty seal on the fuel pres­
sure regulator runout valve.
Then:
- turn off the pump;
- see whether pressure remains constant for 60 seconds after stabilising (i.e. dropping slightly).
If it does not, one or more injectors or a fitting are leaking.
- In this case, disconnect the fuel manifold from the intake manifold and keep the pressure gauge con­
nected.
- Repeat the previous test but leave the pressure gauge cock open.
- After supplying the pump with the engine off, look to see whether any of the injectors or connection
sections are dripping.
Replace any dripping injectors and/or repair the defective seal in the leaking joint.
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