KENYA STANDARD                             DKS 334: 2020  
ICS 43.060.40  
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Road vehicles — Fuel filters  — Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
©KEBS 20 20         Third  Edition 20 20 
 DKS 334:20 20  
 
ii                     © KEBS 20 20 — All rights reserved  TECHNICAL COMMITTEE REPRESENTATION  
 
The following organizations were represented on the Technical Committee:  
 
Toyota Kenya Ltd  
D.T Dobi e 
Mitsumoto  
Isuzu E.A  
Kenya Association of Bus Manufacturers (KABM)  
Kenya Motor Repairers Association (KEMRA)  
Nissan  
Numerical Machining Complex (NMC)  
Gede Enterprises  
Mobius Motors  
KUMPIA  
Kenya Industrial Research and development Institute (KIRDI)  
Technic al University of Kenya (TUK)  
Motorwise Valuers  
Kenya Auto Bazaar Association  
Honda (Nairobi)  
Egerton University  
Olive Technical Services Ltd  
Kenya Jua Kali Association  
MCI Ltd  
Kenya Bureau of Standards — Secretariat  
 
 
 
 
 
 
 
 
 
REVISION OF KENYA STANDARDS  
 
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for improvements to published standards, addressed to the Managing Director, Kenya Bureau of Standards, 
are welcome.  
 
 
 
 
 
 
 
 
© Kenya Bureau of Standard s, 20 20 
  
Copyright. Users are reminded that by virtue of Section 25 of the Copyright Act, Cap. 12 of 2001 of  the Laws of Kenya, copyright 
subsists in all Kenya Standards and except as provided under Section 26 of this Act, no Kenya Standard produced by Ke nya Bureau of 
Standards may be reproduced, stored in a retrieval system in any form or transmitted by any means without prior permission in  writing 
from the Managing Director . KENYA STANDARD                               DKS 334: 2020 
ICS 43.060.40  
 © KEBS 20 20 — All rights reserved            iii  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Road vehicles — Fuel filters  — Specification  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
KENYA BUREAU OF STANDARDS (KEBS)  
 
Head Office:  P.O. Box 54974, Nairobi -00200, Tel.: (+254  020) 605490, 602350, Fax: (+254 020)  604031  
E-Mail: info@kebs.org,  Web:http://www.kebs.org   
 
Coast Region     Lake Region          Rift Valley Region  
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Fax: (+254  041) 229448    Fax: (+254 057) 21814  
 
 DKS 334:20 20  
 
iv                     © KEBS 20 20 — All rights reserved  Foreword  
 
This Kenya  Standard was prepared by the Road Vehicles  Technical Committee under the supervision of the  
Standards Projects Committee and is in accordance with the procedures of the Kenya Bureau  of Standards . 
 
This standard covers performanc e requirements for fuel fil ters. 
 
Taking into consideration the views of consumers, it was felt necessary to revise  this standard to improve the 
quality of  fuel filters used in Kenya.  
 
In the preparation of this standard , reference was made to the following document:  
 
ISO 4020 , Road  vehicles — Fuel filters for diesel engines — Test methods.  
 
Acknowledgement is hereby made for the assistance received from this source.  
 
 
 
 
  
KENYA STANDARD                  KS 334:20 20 
 
 
© KEBS 20 20 — All rights reserved                      1  
 
Road vehicles — Fuel filters  — Specification  
 
 
 
1 Scope  
 
This Kenya Standard specifies materials, performance  requirements, and methods of te st for road vehicles 
fuel filters.  
 
2 Normative references  
 
The following referenced documents are indispensable for the application of this Kenya Standard. For dated 
references, only the edition cited applies. For undated references, the latest edition of the referenced 
document (including any amendments) applies.  
 
KS ISO 4020 , Road Vehicles — Fuel filters for diesel engines — Test methods  
 
3 Materials  
 
3.1 The filter shall be capable of withstanding normal mechanical stres ses encountered in service. The 
use of dissimilar metals  likely to cause corrosion shall be avoided.  
 
3.2 The filtering media shall be impregnated fuel filter paper with a maximum pore size of 1.5 microns, 
wire gauze, felt material, reinforced impregnated paper (with wire gauze) or any other appropriate material 
that meets the performance requirements specified in this standard as per the particular type of application. 
The media shall not disintegrate in performance  for the specified service period.  
 
3.3 The filter casing may be made of plastic, but if made of sheet metal alloy, it shall be protected 
against corrosion.  
 
3.4 The filter shall be free from  any leaks.  
 
3.5 All materials used for the construction of the filter  shall be free from  corrosion.  
 
3.6 All seals shall be of rubber  (e.g. nitril rubber)  non-reactive with fuel a nd with a minimum Shore A 
hardness of 65 International Rubber Hardness degrees.  
 
3.7 All gaskets required for mounting the filter element shall have a minimum Shore A hardness of 4 5 
International Rubber Hardness degrees.  
 
3.8 The threaded end plate may be made of galvanized steel sheet or any other non-corrosive material 
and shall be strong enough to hold engine pressures .  
 
3.9 The compression spring shall be made of spring steel .  
 
3.10 Any adhesive used to bond the filter parts shall be bonded epoxy -based adhesives or equivalent 
that shall be non -reactive to fuels and shall give a strong bond able to resist mechanical stress encountered 
in performance.  
 
4 Tests  
 
4.1 Pressure drop  test  
 
When tested as described in 6.3 of KS ISO 4020 , the pressure drop across the filter shall not exceed  the 
Original Equipment Manufacturer (OEM) specification.  
 DKS 334: 2020 
 
                              © KEBS 20 20 — All rights reserved  2 4.2 Particle retention test  
 
When tested as described in 6.4 of KS ISO 4020 , the percent age particle retention shall be not less than 
90 %. 
 
4.3 Burst test for complete filter  
 
When tested as described in 6.7 of KS ISO 4020 , the burst pressure of the complete filter shall be not less 
than 1.45 Mpa.  
 
4.4 Pulsating  pressure fatigue test  
 
When tested as described in 6.8 of KS ISO 4020,  the filter shall withstand 50 000 cycles without failure.   
 
4.5 Bubble t est  
 
When tested as described in Anne x A of this standard, the volume of escaped air shall not exceed 200 cm3 
per minute.  
 
5 Marking  
 
5.1 The filter and filter packaging shall be legibly and indelibly marked on the outer casing with the 
following:  
 
a) Manufacturers’ name and/or registered trade  mark ; 
 
b) Country of origin ; 
 
c) Manufacturers’ part number . 
 
5.2 Additional markings indicated on  the filter or package shall necessitate additional verifications that 
the filters comply with the claims indicated.  
 
 
 
 
 
 
 
 
 
 
 
 
 
 KS 334: 2020 
 
© KEBS 2012 — All rights reserved           3 Annex A  
(normative)  
 
Bubble test  
 
A.1 The test liquid shall be straight mineral oil at a temperature of 23  °C ± 5 °C and kin ematic viscosity 
between 4 mm2/s and 6 mm2/s. 
 
A.2 Other equipment shall be as in Figure A.1. 
 
A.3 Procedure  
 
Before mounting the filter element to be tested (9) (Figure A.1) on the rotating axle, immerse it in the test 
liquid sufficiently long to complete ly wet the filter medium, and drain off the surplus liquid.  
 
A.3.1 Mount the filter element on the rotating axle (10) and immerse it in the tank (8).  
 
A.3.2 Open the stopcock (3) and adjust the constant pressure device (5) to indicate a pressure of 1.3  kPa 
± 0.1 kPa on the liquid manometer (6).  
 
A.3.3 Turn the filter element at approximately 10 min-1 on the rotating axle. The volume of air escaping in 
one minute shall be measured.   
 
 
 
 
 
 DKS 334: 2020 
 
                              © KEBS 20 20 — All rights reserved  4 TEST COMPONENTS  
① Connection to compressed air line; air must be dry  
② Connection pipe, of metal, nomin al internal diameter  4 mm to 6 mm  
③ Stopcock  
④ Needle  valve (fixed  throttle)  
⑤ Constant -pressure device, adjustable   
⑥ Manometer, adap ted to the measuring range  
⑦ Flexible hose, nominal diameter 4 mm to 6 mm  
⑧ Tank, m inimum capacity 20  L 
⑨ Filter element to be tested 4 mm to 6 mm  
⑩ Rotating axle  
⑪ Rotary fitting  
⑫ Device for rotation of filter element  
⑬ Bubble trap, capacity approximately 1 L, with graduated scale, accuracy of reading 1 cm3 
 
 
OTHER EQUIPMENT  
 
Stop-watch 
 
Figure A.1 — Bubble test