Bơm nhiên liệu DENSO


Bơm nhiên liệu DENSO


The DENSO Difference

The role of the electrical Fuel Pump is to deliver fuel from the tank to the engine, under high pressure, depending on the vehicle application’s specific requirements. The fuel is transported to fuel injectors, which spray the fuel into the engine cylinders. Types of Fuel Pump include in-line and in-tank types. The in-tank type, located in the fuel tank, is currently the most widely used.

Not All Fuel Pumps are Created Equal


DENSO’s proprietary turbine pump technology delivers the highest sustained fuel pressures in the industry, and this is why our pumps are chosen as standard equipment by the world’s most demanding OEMs, especially for their premium vehicles.


DENSO’s open-vane impeller is more efficient than competitor’s closed-vane impellers. Our ultra-efficient design yields low amperage requirements to ensure optimum flow rates are maintained over time.

Silent Operation

DENSO carefully balances every unit to guarantee the quietest operation possible. The armature in a DENSO fuel pump is precision balanced at 3,000 rpm, and then spun again at 8,000 rpm to minimize noise and vibration. Many competitors do not balance their armature at all.

1. Armature: Ultra-high balanced to minimize noise and vibration.

2. Turbine Technology: Delivers fuel with minimal pressure pulsation for quieter operation.

3. Check Valve: Maintains consistent system pressure for superior hot fuel handling characteristics.

4. Relief Valve: Protects the fuel delivery system.

5. Choke Coils: Minimize radio interference.

6. Brushes: Designed for durability, efficiency, and low-resistance operation.

Features and Benefits

1. Low Noise: Turbine pump technology with a V-shaped internal impeller delivers fuel with minimal pressure pulsation, for quiet operation.

2. Accuracy: Accurately measures pressure for better performance.

3. All-New: Pumps contain all new parts, not remanufactured.

4. Performance: Operate at higher speeds and draw less current than older style pumps.

The Fuel Pump Module

The Problem with Today’s Aftermarket Modules

Most modern day fuel pumps are designed and sold as a complete assembly called a fuel pump module, and most modules are designed to accept only the OE pump or a low-quality “knock-off.” The OE module comes with a high price at the dealer, while the lesser-brand may be competitively priced but is often unreliable. After all, when it comes to reliability, it’s all about the pump.

The DENSO Solution Module

Finally, DENSO has the solution! We’ve redesigned these modules to incorporate our high-quality fuel pumps. Now you can have the quietest, most reliable fuel pump available, custom-fit into vehicle specific modules, for applications where DENSO is not the OE supplier. DENSO Fuel Pump Modules offer you the best of all worlds: DENSO’s proven fuel pump technology combined with First Time Fit® quality and convenience. That’s a win-win combination!

Other Key Features of DENSO Solution Modules

– DENSO’s proven turbine fuel pump technology

– 2×2 to 1×4 harness conversion pigtail included

– Upgraded fuel pressure sensor

– Upgraded sender card with 5-finger wiper

– External compression springs reduce the possibility of chaffing the reservoir

– Tests have proven DENSO Fuel Pumps offer more than triple the lifetime with the same flow performance and half the power consumption of competitive fuel pumps

The Logical Choice…

– To maintain optimum fuel economy and low emissions — modern vehicles require an efficient fuel pump.

– DENSO First Time Fit Fuel Pumps deliver on all counts, and they are designed to fit perfectly the first time.

– DENSO is both an OEM and aftermarket supplier of fuel pumps and fuel pump modules. In addition, DENSO also produces fuel pump modules for non-OEM applications, and the product offering for non-OEM fuel pumps and fuel pump modules is expanding to accommodate a wider range of vehicles.

DENSO First Time Fit Fuel Pumps and Modules: the logical choice when you need a new fuel pump or a complete fuel pump module.


How fuel pump works

– The location of an in-tank Fuel Pump helps to reduce noise produced by the electric fuel pump motor. It also keeps the pump supplied with fuel, lubricating and cooling the pump motor.

– When the impeller of an in-tank Fuel Pump rotates, the blade moves around the impeller, creating a swirling motion inside the pump to deliver fuel. The fuel then passes around the motor, forcing the check valve upwards to supply fuel to the fuel pipe. Due to the use of engines with large cylinder displacement, Fuel Pumps with greater capacities are increasingly needed. The discharge volume of these pumps must therefore be controlled to suit the operating conditions of the engine. This is made possible by the turbine technology of in-tank Fuel Pumps.

Installation and fault finding


As gasoline is involved when working on the Fuel Pump, work in a ventilated area away from open flame.

– Relieve fuel system pressure before starting the replacement procedure, and refer to car maker’s instructions for specific steps.

– Drain tank, loosen tank straps and lower the tank; or locate the service hole in the boot; or disconnect the rear seat cushion (some vehicles have a removable access panel to the Fuel Pump module, allowing Fuel Pump replacement without removing the tank).

– Disconnect Fuel Pump module connector

– Disconnect fuel tank main tube

– Remove Fuel Pump module from fuel tank

– Remove fuel suction support

– Remove fuel pressure regulator if necessary

– Remove strainer

– Remove fuel suction plate and disconnect the Fuel Pump connector or wiring

– Remove Fuel Pump

For installation, perform the removal steps above in reverse order. To check for fuel leaks refer to the car maker’s instructions.


– No initial combustion: No combustion occurs due to no operation or difficult start-up

– Stalling: Engine stalls shortly after startup due to no operation; or engine stalls when accelerator is depressed.

– Poor drivability: Hesitation during acceleration due to decreased flow quantity; insufficient output caused by no increase in fuel pressure; engine backfires; or abnormal knocking.

Prevention and Solutions 

It is very important to make a correct diagnosis before installing a new Fuel Pump. This is because the real root cause might be another component than the Fuel Pump, such as a clogged strainer, contaminated fuel filter, faulty fuel gauges or even very low levels of fuel in the fuel tank. To help prevent Fuel tank problems:

– The Fuel Pump and fuel system should be maintained in good condition

– The vehicle should not be driven with a nearly empty fuel tank

– Attention should be paid to the fuel quality and octane level

– The fuel filter should be checked periodically and replaced before its service life is up

– Fuel hoses and electrical connections should be regularly checked for cracks, leaks and any other defects

– If the Fuel Pump needs to be replaced, ensure the fuel system is clean and the fuel tank is free from contaminants.



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