Fiat 1998 Marea Weekend, Service Manual

Page: 318 / 846

Engine
Fuel system
16v
Marea- Marea Weekend ft
99 update
Checking fuel supply circuit pressure
Prepare the test equipment 1860955000, using the adapators constructed previously and fitted as illus-
trated in the diagram below, with ball valves (a), (b) and (d) in the fully open position and valve (c) in
the closed position.
1. Complete electric pump
2. Fuel supply pipe
3. Adapator (A)
4. Test equipment No. 1860955000
5. Adapator (B)
6. Fuel manifold
7. Rapid attachment connector on manifold
After having discharged the pressure, remove the end of the fuel supply pipe (2) from the rapid connector
(7) on the manifold, following the instructions on the previous pages, connect it to the adapator (A) fe-
male connector, connect the new male end of the adapator (B) to the rapid connector on the fuel mani-
fold (7) and check that the connectors are correctly engaged.
Turn the ignition key to the ON position and check, on the gauge (e), that, after increasing to around 3.5
bar, the pressure then settles down at round 3.2 bar (the fall in pressure is due to the fact that if the en-
gine is not started up, after the pump has been running for several seconds, it cuts out).
If the decrease in pressure is more than the values mentioned above, check the seal of the section of the
system upstream of the fuel manifold and check the seal of the injectors, proceeding as described below.
Checking fuel supply pipe seal
Keep the test equipment as described in the previous paragraph, close valve (b), keeping valve (c) closed
and valve (a) in the fully open position.
Turn the ignition key to the ON position and check, on the pressure gauge (e) that, after having increased
to around 3.5 bar, the pressure settles down at around 3.2 bar (this decrease in pressure is due to the fact
that if the engine is not started up, after operating for several seconds, the pump cuts out).
48
Print n° 506.763/15