Fuel Pressure Sensors

Fuel Pressure Sensors - what they they are, what they do and how to replace them.

Fuel pressure sensors(FPS)

What is a FPS? What does it do?

Your common rail Diesel Engines is fitted with a fuel pressure sensor.

In European cars the most common make is Bosch; followed by Delphi and Siemens and then Denso The fuel  pressure sensor signals the pressure in the fuel rail to the ECU . The rail contains a pressurised supply of diesel fuel ready for the injectors to use; when the pressure in the rail drops the sensor signals this to the ECU and pressure (via the pump) is restored. The ECU  controls the  supply of fuel  to the rail from the high pressure pump; it does this by means of a Fuel pressure control valve. If the fuel pressure sensor fails or becomes faulty run a diagnostic check on the vehicle. You will find the fault codes listed here

What does a fuel pressure sensor look like?

bosch fuel pressure sensor

Bosch FPS

delphi fuel pressure sensor Fuel pressure sensor screws into the common rail. It is easy to remove (when the engine is switched off) simply remove the electric male connecting plug and unscrew in a conventional way.

Why is the Fuel pressure sensor different?

What other types of sensor are there on a diesel engine?

bosch mercedes fuel pressure sensor

Mercedes
0281 002 700

The Fuel pressure sensor is not a solenoid  i.e.  it does not switch on and off. It senses the pressure of the fuel in the common rail. There are other sensors on the engine including:

  • crank position sensor
  • cam position sensor
  • air flow meter/ sensor
  • temperature sensor
  • boost pressure sensor

 Does the Fuel pressure sensor go wrong?

Yes. The fuel pressure sensor is a weak point in the loop system and all types are prone to failure.

Can I just change the sensor or do I have to change the rail as well?

I’ve been told to change the rail as well as the sensor. Is this necessary? Changing the rail is not necessary. If the sensor is faulty just change the sensor!

Fuel sensors for sale. Buy Fuel pressure sensor

 

How will I know if  the FPS is faulty?

Common symptoms of Fuel pressure sensor failure are cutting out, difficult to start, rough erratic running etc. If the sensor is faulty you will get an error code indicating this when you do a scan on the engine.

Is it easy to replace?

Yes it is easy to replace and you will not need to recode the engine. You may however need to cancel fault codes in the ECU memory

Do I  have to fit ‘like for like’?

Yes you do have to fit ‘like for like’. If the id numbers of a replacement Fuel pressure sensor correspond to the original then it can be used. Bosch numbers are 10 digit starting 0281 002 – – – Siemens also use 10 digit numbers like 9658227880 and id’s like 55PP06-03 These numbers are printed on the sensor or stamped into the plastic

What are the different makes? Which vehicles are they fitted in?

Bosch, Siemens/Delphi, Denso (Japanese) are the main makes of fuel pressure sensor. There are no hard and fast rules. Denso are fitted into Mazda, Toyota, Nissan. But you will find Bosch sensors fitted in Kia, Hyundai, etc.

How can I identify which FPS fits my vehicle?

You will need to establish the make and  identity  number. It’s best to get this from the sensor itself to avoid incorrect replacement.

Where can I buy a replacement?

Diesel Injectors UK carry a large range of fuel pressure sensors of all makes. The aim of this page is to provide more information about fuel pressure sensors and id numbers

Summary: Fuel pressure sensors – and how to identify them.

The fuel pressure sensor is usually screwed into the common fuel rail (solid rail fuel injector feed pipes also bolt to this rail) . Removal and fitting does not require special tools. Replacement sensors do not normally require coding The fuel pressure sensor is a weak point in the loop system and all types are prone to failure.

Bosch, Delphi, Siemens and Denso…

In European cars the most common make is Bosch;  followed by Delphi and Siemens and then Denso