HIGH PRESSURE , HIGH PERFORMANCE
CARWOOD elaborates on the most common causes for failure found in common rail pumps and how to prevent them .
Common rail systems consist of a shared high-pressure reservoir ( common rail ) that supplies all the cylinders with fuel . Considered as the heart of the fuel system , this is where diesel fuel pressure increases . Unlike conventional diesel injection systems where fuel pressure has to be generated individually with each injection , common rail systems generate pressure separately from injections , allowing fuel to constantly be available at the required pressure for injection .
PUMPING INFORMATION
By constantly feeding fuel to the common rail , the high-pressure pump maintains system pressure that keeps fuel readily available even at low engine speeds . This is because the pressure generation is not reliant on the engine speed .
Most common rail systems today are equipped with radial piston pumps . These are typically favoured for their improved efficiency , producing high pressures and low noise levels .
MAINTAINING GOOD PRESSURE
Carwood is the approved diesel remanufacturer for OE diesel systems such as Bosch , Denso , VDO and Delphi . Whilst the construction of common rail pumps may differ slightly between each manufacturer , the most common causes for fuel pump failures are :
• Inadequate filtration and poor filter quality
• Filter service life exceeded
• Internal parts are corroded and contaminated
• Water contamination
In order to prevent these issues that can lead to failure of the pump , it is essential for installers to observe the best practices whilst servicing these powerful , yet delicate systems .
The quality of fuel and filtration is critical to the overall performance of common rail systems . Inadequate fuel quality and filtration can lead to the contamination and corrosion of the pump interior .
Carwood advises that installers should always maintain recommended service intervals and use OE quality filters when replacements are necessary . Vehicle owners should also ensure that they are using the correct fuel grade ( EN590 ).
EXACTING STANDARDS FOR BETTER EMISSIONS
Due to the fine tolerances that they work in , the latest common rail systems have proven to improve performance with quieter engines , lower fuel consumption and reduced emissions . All remanufactured parts within the FPS common rail range by Carwood only use OE quality component parts and adhere to OE repair processes . In addition to performing a ‘ plug-in diagnostic ’, it is also important for installers to perform a mechanical pressure test ( false actuator test ) to check the pressure control valve control .
CR SYSTEM SUPPORT
Carwood and FPS recently created a fault diagnosis guide . With comprehensive key points and easy-to-follow action charts , the guide provides systematic steps to help service common rail diesel systems effectively , efficiently and safely . This guide is available for download by scanning the QR code to the right .
Common Rail Diesel System Faults Diagnosis
ONLINE ORDERING AT WWW . FDRIVE . CO . UK
Carwood also offers product support with a dedicated technical helpline that can be reached at 0844 876 2524 .
Catalogued on the F : Drive and MAM Autocat , Carwood remanufactured common rail parts are available from FPS via same / next-day delivery . Speak to your local FPS representative for more information .
Diesel pump fault identification
Internal parts contaminated due to inadequate filtration .
M-prop valve on Bosch fuel pump corroded due to poor fuel quality , water contamination and / or inadequate filtration .
VITAL NEWS ISSUE 47 COMMON RAIL PUMPS 15