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30 User’s Handbook, TSL 4186E, Issue 2
4012/16 Diesel
How to prime the fuel system (4012/16 engines with optional change-over filters)
Caution: A small container or an absorbent material must be used to catch/soak up spilled fuel.
1 Open the fuel vent screws (A1) on top of the change-over filters.
2 Operate the priming pump (B1) until air free fuel flows from the vent screws, then tighten the vent screws.
3 Loosen the fuel fitting nut (C1) on the fuel rail feed pipe, at the flywheel end of the fuel rail ‘A’ bank.
Note: Hold the fuel fitting (C2) in position when loosening the fuel fitting nut.
4 Operate the priming pump (B1) until air free fuel flows, then tighten the fuel fitting nut (C1).
5 Repeat steps 3 and 4 for ‘B’ bank.
6 Loosen the fuel fitting nut (D1) on the fuel return pipe, cylinder No. 1 ‘A’ bank, at the gearcase end of the
fuel rail.
Note: Hold the fuel fitting (D2) in position when loosening the fuel fitting nut.
7 Operate the priming pump (B1) until air free fuel flows, then tighten the fuel fitting nut (D1).
8 Repeat steps 6 and 7 for ‘B’ bank.
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