Linhai HY740STL 2018, Service Manual

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CHAPTER 3 ENGINE
M750L SERVICE MANUAL 18.0
CHAPTER 3 ENGINE PAGE 3-
97
Check for fuel pump running noise for
3 seconds after ignition key is ON. to step 4.
2 Disconnect fuel module coupler.
Check voltage at harness coupler.
Is the voltage within 10-14V?
Go to step 3 Check the electrical
circuit from Ignition to
fuel module.
3 Connect 12V DC power supply
(battery) to fuel module.
Make sure that enough fuel available
in fuel tank to avoid fuel pump running
dry.
Is the fuel pump running? 1. Check electrical
circuit from fuel
module to ECU
2. Check ECU 1. Check Fuel Pump
Harness integrity
2. Check Fuel Pump
4
Check fuel system pressure at Injector
inlet (with a T-joint) while engine is
running in idle condition.
Is the pressure between 220 ~
270kPa? Fuel Module
Operation
Normal Go to Step 5
5 Is the Pressure below 220kPa? 1. Check for
leakages from
hoses, hose joints
2. Check Fuel Pump
3. Check Pressure
Regulator 1. Clogged Filter
2. Kink/ Blockage in
Fuel Hoses
3. Check Re
3.18.8.8 Fuel Module Removal:
Relieve fuel pressure in fuel lines referring to the ‘Fuel Pressure Relief Procedure’
provided in this section.
Disconnect negative cable at battery.
Disconnect fuel module wire coupler.
Drain the fuel in fuel tank thru fuel filler with help of hand pump (siphon). Collect the
fuel in approved container for contamination and safety.
Disconnect the fuel hoses from fuel module by using standard tools
Remove the fuel tank from vehicle.
Place the fuel tank with bottom up condition. Care to be taken not to cause any
scratches/ damages on fuel tank.
Open the fuel module mounting bolts.
Take out fuel module assembly from fuel tank with care
Care to be taken not to damage the strainer while removing fuel module from tank.
3.18.8.9 Fuel Module Installation:
Replace the fuel module gasket in fuel module assembly with a new one. Old/ used
gaskets can cause leakages.
Fold strainer towards fuel pump and insert fuel module in tank opening with care. Care
should be taken not to cause any damages on strainer.
Fuel Module Orientation: Fuel module bolts not symmetrical and can be mounted
only in the intended direction. Regulator side should be facing the Fuel Tank rear
side.
Make sure that the fuel tank surface at module mounting area is clean and free of
surface defects.
Place the bolts on module cover and tighten the bolts gradually in star pattern
sequence to apply equal compression on gasket. It is shown as below.