WL-C Engine Fuel System
High-Pressure Pump
• The BT-50 uses the high-pressure pump (CP3S3) with three pumping elements offset by
120°. The operation is similar to the high-pressure pump (CP3.2) used on the Mazda3
(1.6 MZ-CD), which is also manufactured by Bosch.
BT-50_01030
1 Fuel return 4 High-pressure pump
2 Fuel high-pressure from fuel filter 5 Fuel metering valve
3 Fuel temperature sensor 6 Gear-type feed pump
Common Rail
• The common rail is equipped with a fuel pressure sensor and a pressure limiter valve,
which are not available as separate spare parts. In case of a malfunction on these
components the common rail must be replaced as a unit.
BT-50_01031
1 Connection (fuel injector side) 4 Common rail
2 Fuel pressure sensor 5 Pressure limiter valve
3 Connection (high-pressure pump side)
NOTE: The high-pressure pipes can be re-used up to five times after removing.
Service Training BT-50 01-29
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