Fuel Pumps

To deliver fuel from the fuel tank to the engine journey after journey, your fuel pump needs to be reliable for smooth and efficient driving requirements.

How DENSO fuel pumps work
Types and characteristics
Installation and fault finding
Back

Fuel Pumps

How DENSO fuel pumps work

To keep your engine running efficiently for its entire lifetime, fuel needs to be delivered reliably from the tank under a high pressure that is specific to your vehicle’s requirements. The fuel pump is key to this process and ensures that fuel is transported to the rest of the engine quickly and efficiently.

DENSO provides in-tank fuel pumps which are the most widely used and are located within the fuel tank itself. The positioning of an in-tank fuel pump means the noise from the electric motor is reduced and the pump is continuously supplied with fuel, keeping the motor lubricated and cool. When the impeller of an in-tank fuel pump rotates, the blade moves around the impeller. This creates a swirling motion inside the pump which then passes fuel around the motor, forcing the check valve upwards to supply fuel to the fuel pipe.

The turbine technology inside DENSO’s in-tank fuel pumps offers greater supply capacity and better control over the discharge volume, meaning the performance can be adjusted to suit the operating conditions of particular engines.


Overall fuel pump image cutaway showing suction pump model DFP 0100

Features and benefits

  • Turbine technology minimizes pressure pulsation and noise.
  • Accurate pressure measurement improves performance.
  • All-new parts mean DENSO fuel pumps have a longer lifetime.
  • Higher operation speeds with less required current.
  • Highest quality and manufacturing precision enables long and stable performance
Innovative technology
Our turbine technology with a V-shaped internal impeller helps to minimize motor noise and maintain the performance of DENSO fuel pumps for a longer lifetime.
Accurate performance
Pressure is continuously measured within our in-tank fuel pumps to ensure the requirements are met for each engine type and specification.
Reliability and quality
DENSO fuel pumps are specifically made to fit the right application, and both manufactured and tested with OE standards to meet exact fuel pressure demands. Therefore, you can be sure they will deliver high performance for a longer lifetime.

Types and characteristics

The superior performance of our turbine technology makes our in-tank fuel pumps some of the most reliable and high quality on the market.

Fuel Pumps types

Type C in-tank

In-tank pumps are the most commonly used type of fuel pump, with DENSO products providing effective fuel delivery to the engine journey after journey.

C Type fuel pump model no DFP 0101
Type H38 in-tank

With greater supply capacity and accurate pressure measurement, DENSO in-tank fuel pumps will ensure the right amount of fuel is delivered to the engine, enhancing overall performance.

H38 type fuel pump model no DFP 0106

Characteristics

DENSO fuel pumps have been designed to deliver fuel to any type of engine accurately and efficiently so manufacturers can enjoy optimum performance in any car model.

Installation and fault finding

The correct installation of your fuel pump and quick, accurate fault finding will help you to maintain reliable engine performance.

Installation

Find out more about the installation of DENSO fuel pumps

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

  2. 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).

  3. Disconnect fuel pump module connector.

  4. Disconnect fuel tank main tube.

  5. Remove fuel pump module from the fuel tank.

  6. Remove fuel suction support.

  7. Remove fuel pressure regulator if necessary.

  8. Remove strainer.

  9. Remove fuel suction plate and disconnect the fuel pump connector or wiring.

  10. 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.

  • Always disconnect the cable from negative (-) battery terminal before replacement and wait at least 90 seconds after disconnecting the cable to prevent any type of activation. After replacement, connect the cable to negative (-) battery terminal.

  • As gasoline is involved when working on the fuel pump, work in a ventilated area away from open flame.

Fault finding

Discover how to find and fix fuel pump faults quickly:

  • The most common cause of in-tank electric fuel pump failures is fuel tank contamination due to dirt and rust. Therefore it is essential that a replacement fuel pump should be installed into a clean fuel tank.

  • Another common cause of in-tank electric fuel pump failures is faulty electrical connections such as loose connections, poor grounds or low voltage to the pump due to overheated connectors.

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

  • Stalling: engine stalls shortly after start-up due to no operation, or engine stalls when the 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.

  • 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.

Browse
Ignition
Fuel Pumps
Glow Plugs
Ignition Coils
Spark plugs