Page 1261 - Workshop Manual - Tunland (2017)

FUEL - FUEL SYSTEM 12-1

FUEL SYSTEM

PRECAUTION 12
1 . Since fuel is hazardous and flammable, be sure to keep spark or flame source,
such as cigarrette, working lamp, arc unit and switch, away from the site before
working on the fuel system. It is also important to equip fire extinguisher and
ventilation system at the site, in order to avoid personal casualty.
2 . Disconnect the negative battery cable before overhauling the fuel system.
3 . When disassembling the fuel pipes, collect the discharged fuel with a proper
container.
4 . Since there is pressurized fuel inside the fuel pump, high-pressure fuel pipes
and fuel rail, do not unscrew any fuel connector when the engine is running, in
order to prevent personal injury.
5 . Keep the fuel away from any part or component made of rubber or leather.
6 . Since the fuel injection unit is a precise component, keep the site clean when
operating the fuel system. Seal the disconnected fuel connector to prevent
impurities from entering.
7 . After the ignition is switched off, the residual pressure in the fuel system will
last a certain period. Before repairing the fuel system, it is important to relieve
the fuel pressure, or it may lead to personal injury.
8 . Before disconnecting the fuel pipes, clean the dirt or impurities around the fuel
connector, or i may enter the connector and damage the fuel system.
9 . The cleaner should not get in touch with the rubber or plastic parts in the fuel
system, or it may lead to fuel leakage.
10 . Do not twist the fuel pipes by force.
11 . Make sure there is no damage or dirt on the fuel connectors before connecting
the fuel pipes.
12 . Wear safety goggles when working on or near fuel-related parts and components,
or the injected fuel may injure your eyes.
13 . The removed fuel system parts and components shall be placed in a clean area.
14 . Since zinc, manganese and other active metals may be easily dissolved by diesel,
it may result in injector coking under high temperature and thus block the nozzle.
Therefore, do not use any part containing zinc, manganese or other active metals
in the pipes of pressurized common-rail fuel system.
15 . Keep the interior of the fuel system clean and free of rust, weld slag or other
impurities, or it may lead to fuel pipe blockage, automatic switch-off of the engine
or even damage the precise fuel common-rail parts and components in extreme
circumstance.
Discharge the pressure in the fuel system
1 . Disconnect the high-pressure fuel pump harness connector.
2 . Start the engine and keep idling, until the engine is switched off by itself.
3 . Restart the engine for approx. 5 seconds and ensure all pressure in the fuel
system is fully released.
4 . Connect the high-pressure fuel pump harness connector. 12B FUEL - FUEL
SYSTEM 12B-1