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28 User’s Handbook, TSL 4186E, Issue 2
4012/16 Diesel
How to prime the fuel system (4012 engines with standard filter/water separator)
Caution: A small container or an absorbent material must be used to catch/soak up spilled fuel.
1 Loosen the fuel fitting nut (A1) on the fuel rail feed pipe, at the flywheel end of the fuel rail ‘A’ bank.
Note: Hold the fuel fitting (A2) in position when loosening the fuel fitting nut.
2 Operate the priming pump (B1) until air free fuel flows, then tighten the fuel fitting nut (A1).
3 Repeat steps 1 and 2 for ‘B’ bank.
4 Loosen the fuel fitting nut (C1) on the fuel return pipe, cylinder No. 1 ‘A’ bank, at the gearcase end of the
fuel rail.
Note: Hold the fuel fitting (C2) in position when loosening the fuel fitting nut.
5 Operate the priming pump (B1) until air free fuel flows, then tighten the fuel fitting nut (C1).
6 Repeat steps 4 and 5 for ‘B’ bank.
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