1. 2641A312 HEUI Pump Utilized Position
Example: The HEUI pump code is as follows
| N0. |
Name |
| A |
Nameplate, logo, coding |
2. 2641A312 HEUI Pump Installation Precautions
(1) The replacement of the HEUI pump must strictly follow the electrical system, the approved pressure of the low-pressure fuel intake system, the approved pressure of the high-pressure fuel circuit system, and fuel system replacement consumables requirements (including the low-pressure fuel circuit system filter and the high-pressure fuel circuit) specified in the vehicle engine maintenance manual.
(2) When install the HEUI pump, strictly follow the manual of replacement of wearing parts of the fuel system, cleaning requirements for the connection between the fuel system and the HEUI pump, the fitting clearance of the HEUI connection, the installation angle and tightening torque of the HEUI pump, the fitting clearance of the intake system, and the fitting clearance of the exhaust system, so that to ensure the service life of the engine and the normal operation of the HEUI pump.
(3) When installing the HEUI pump on the engine, it is necessary to clean the engine block, cylinder head and other parts connected to the HEUI pump, and ensure that there is no dust, carbon deposits, water, rust spots, etc.
(4) If don’treplacenew washer shim, it can lead to: deformation of HEUI pump, oil leakage and air leakage, which will cause serious damage to the HEUI pump and HEUI pump to break and cause damage to the engine.
(5) When installing the HEUI pump on the engine, please carefully check the components related to the installation of the HEUI pump are not deformed, such as the HEUI pump pressure plate, screw, HEUI pump rod and other accessories, and install it in strict accordance with the operation steps of the engine maintenance manual.
(6) It is forbidden to operate the bare HEUI pumpfor a long time in an environment with serious dust pollution and corrosion to iron products.
(7) It is forbidden to operate the bare HEUI pump for a long time in a strong magnetic field environment.
3. Reasons For 2641A312 HEUI Pump Not Working Normally
(1) There is air in the oil circuit of the engine fuel system.
(2) Vehicle oil pump oil supply system is not normal.
(3) Engine common rail system oil leakage or pressure limiting valve is damaged.
(4) There is a short circuit, cutting out and poor contact in the wiring harness connected to the HEUI pump of the vehicle.
(5) The long-term placement of the HEUI pump causes the anti-rust oil to solidify, and the internal components are stuck or the oil holes are blocked.
(6) Before installing, carefully check whether other components in the common rail system except the HEUI pump are damaged so as to prevent the HEUI pump from not working properly after being replaced.
4. 2641A312 HEUI Pump Storage Standard
（1）Choose a suitable storage place
The warehouse and cargo yard where HEUI pump is stored should be kept clean and dry, and away from the factory buildings that generate harmful gases and dust; do not mix with acid, alkali, salt and other substances; the storage place should have a good drainage system; the cargo yard should be flattened with gravel or furnace ash etc. to enhance the water permeability of the surface layer to keep the reservoir area dry.
（2）Strict requirements of warehousing
Strict inspections should be carried out when HEUI pumps are put into storage, the surface cleaning work should be done well to remove water traces, oil stains, ash and other dirt, remove the rust and do anti-rust treatment in time. The packed HEUI pumps must be protected from being damaged.
（3）Keep the warehouse dry and prevent moisture
The relative humidity is usually below 70% for HEUI pumps placed in the room, and the corrosion of HEUI pumps is significantly reduced.
HEUI pumps must be stored in the warehouse, and they are forbidden to store in the same warehouse with commodities with high water content.
（4）Stack Properly
After the HEUI pump is exposed in rain, the corrosion rate will increase significantly. The purpose of sealing is to isolate the HEUI pump from rainwater and humid air, so the warehouse window should be checked in time to avoid rainwater entering the warehouse
If the HEUI pump package is damaged, it should be repaired or replaced; when the package is damp, the packaging material should be dried; if the original anti-corrosion and oil applied at the factory is found to be damaged or dried up, it should be cleaned and re-applied oil in time.
. It is forbidden to leave the HEUI pump exposed in the air for a long time.
. It is forbidden to store acid, alkali, salt and other substances together with the HEUI pump.
. The unpacked HEUI pump must be rust-proof during secondary storage.
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