Fiat Bravo Service Manual page 142

Engine
Fuel system
10.
If pressure measured in test 1 (see previous page) exceeds 1.1 ± 0.1 bar 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.
- operate the fuel pump with engine idling, then take pressure reading off pressure gauge:
a) if it reaches 1.1 ± 0.1 bar replace the fuel return pipe to the tank because it is blocked or kinked;
b) if it exceeds 1.1 ± 0.1 bar replace the pressure regulator because it is defective.
Then:
- turn off the pump;
- see whether pressure remains constant for 60 seconds after stabilising (i.e. dropping slightly).
- 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.
40
Bravo-Brava @ i
Test 2
Testing maximum fuel feed pressure
(or pump efficiency)
Same connections as previous test.
- Close fuel cock lever (A);
- operate the pump with the engine off,
as described previously: pressure
should not exceed 5 bar (pump pres-
sure relief valve setting). Otherwise,
replace the pump because it is defec-
tive.
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 so that fuel pressure and
injection pressure is the same.
Publication
12v
no. 506.670