CE ENGINE FUEL SYSTEM
3-6
©
200416
Description of components
2
ΧΦ65/75/85 series
4
3.5 FUEL RETURN OVERFLOW VALVE
The injectors are mounted in the cylinder head.
The injectors do not have a separate return
connection. In place of this there is a longitudinal
bore in the cylinder head that meets the injector
bores of all cylinders coinciding with the height of
the return ports of the injectors. A pressure relief
valve is mounted at the end of the bore to prevent
vapour bubbles forming in it and to prevent it
emptying after the engine is turned off. This valve
maintains a residual pressure in relation to the
return pressure of 1.2 to 2.0 bar.
The pressure relief valve consists of a spring-
loaded plunger (1) and a housing (2) with quick-
release inlet and outlet connections (A and B
respectively).
AB
1 2
i400861
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