Fiat 1998 Marea Weekend, Service Manual

Page: 201 / 846

Marea- Marea Weekend ©
TO
Engine
'98 range
Fuel system
10.
INTRODUCTION
From chassis no. 205884, a new hot-film flowmeter has been adopted instead of the vane-type flowme-
ter.
The hot-film flowmeter is more precise and, as it has no moving parts, it is more reliable than the previ-
ous version.
With the introduction of the new flowmeter, other parts have also been affected by the modification; in
addition to the hot-film flowmeter the new parts (added or modified) relating to the fuel system are as
follows:
- Modified air duct connecting air cleaner to flowmeter.
- Modified air duct connecting flowmeter to turbine.
- Modified flowmeter mounting bracket. \
- Replaced engine coolant temperature sender unit with a new sender unit which comprises two sepa-
rate sensors: one for the fuel injection and one for the instrument panel gauge.
- Added intake air temperature sender unit which is no longer built into the flowmeter, but is a single
component located upstream of the new hot-film flowmeter.
- Modified fuel injection pump: on the fuel outlet connection for the return to the tank, the 0.75 mm cal-
ibrated hole has been replaced with a valve calibrated at the pressure of about 4 bar; this allows the
pump not to empty and to keep fuel under pressure in it, thus ensuring better engine starting.
- New Bosch 0.432.217.297 fuel injectors.
- New Bosch 0.432.217.296 instrumented fuel injector.
- New MSA 11 Bosch 0.281.001.741 fuel injection electronic control unit.
- New fuel injection wiring for connection to the new sensors.
This section only covers the parts of the 2387 TD engine fuel system which are different in relation to the
previous version.
For aspects not covered in the following pages, see the descriptions give in the "Fuel system of 2387
TD" in the basic edition, contained in volume 1.
Copyright Fiat Auto 1