Checking The Injector Seal; Checking The Seal Of The Injectors - Fiat 1998 Marea Service Manual

Marea-Marea Weekend
99 update

Checking the injector seal

If there is a decrease in pressure beyond the figures given above, check the seal of the section of the sys-
tem upstream of the manifold and, if there are no leaks or damage to the fuel supply pipe, replace the
electric fuel pump assembly because, as described in the paragraph dealing with the fuel pump, the pres-
sure regulator is housed in the same unit and CANNOT be replaced.
If, after having repeated the check, the pressure exceeds the recommended figure and is considerably
higher, replace the electric fuel pump because there are operating faults with the pressure regulator which
is housed inside it.

Checking the seal of the injectors

1. Complete electric pump
2. Fuel supply pipe
3. Adaptor (A)
4. Test equipment No. 1860955000
Keep the test equipment as described in the previous paragraph, place valve (b) in the fully open position,
keeping valve (c) closed and valve (a) in the fully open position.
Turn the ignition key to the ON position and observe on the pressure gauge (e), that the pressure, after
having increased to around 3.5 bar, settles down at a pressure of around 3.2 bar, then close valve (a) and
check that the pressure remains constant for at least a minute; if this is not the case, then one or more of
the injectors is leaking.
Copyright Fiat Auto
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5. Adapator (B)
6. Fuel manifold
7. Rapid connector on the manifold
8. Injectors
Engine
Fuel system
10.
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