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Secondary Inline Diesel Filter
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Jetlag
 


Member Since: 10 Mar 2012
Location: Johannesburg
Posts: 205

South Africa 2012 Discovery 4 3.0 SDV6 HSE Auto Fuji WhiteDiscovery 4
Secondary Inline Diesel Filter

Working up in West Africa and looking under the bonnet (hood for our American friends) of our site vehicles (Toyota Hilux) there is a secondary Inline Diesel filter fitted to aid in removing any dirt from the dirty fuel found in certain parts.

This brings my question, has anyone fitted a secondary Diesel filter? If yes, could you share some insight on how/ where / what?
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Post #190243717th Jan 2018 8:47 am
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Hardware
 


Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12676

United Kingdom 2011 Discovery 4 3.0 SDV6 XS Auto Sumatra BlackDiscovery 4

it would need to be (very) high-flow ... search for DSL posting about hi s car going onto limp mode with an "equivalent" filter fitted at service. couldn't let enough fuel through. so if you add a secondary filter it will need to be higher flow than the main one I'd suggest.
  
Post #190245017th Jan 2018 9:24 am
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72741

Ukraine 

Not a good experience!!! Was frequently going only limp mode, even on moderate throttle increase, I could even trick it into doing it on demand. Scary at first on the motorway, especially with trucks to left and rapidly approaching behind. SWMBO refused to drive the car after that, the car was piggin dangerous. The cure was a restart, not necessarily stopping first. Whistle

New LR filter fixed it. Thumbs Up
   
Post #190245917th Jan 2018 9:38 am
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Robbie
 


Member Since: 05 Feb 2006
Location: ¯\_(ツ)_/¯
Posts: 17932

United Kingdom 2013 Discovery 4 3.0 SDV6 HSE Auto Baltic BlueDiscovery 4

The high pressure side of the fuel system would be trashed by any solid contaminant. To avoid this the fuel does a wall of death in the swirl pot, then through one filter and then on to another. Virtually all of this filtered fuel goes back to the fuel tank to be subjected to the same scrubbing. Only a small fraction of the fuel makes it all the way to the injector nozzles.

I really would not worry about insufficient filtering.
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Post #190257917th Jan 2018 3:29 pm
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Brucey
 


Member Since: 24 Oct 2015
Location: Bedfordshire
Posts: 137

2012 Discovery 4 3.0 SDV6 XS Auto Indus SilverDiscovery 4

I’m interested in this subject too as my D4 is in Kenya.

Interesting description of the fuel system Robbie. So is there a filter on the lower pressure pump in the tank as well as the filter under the car? Where does the wall of death take place?
  
Post #190259117th Jan 2018 3:57 pm
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Hardware
 


Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 12676

United Kingdom 2011 Discovery 4 3.0 SDV6 XS Auto Sumatra BlackDiscovery 4

from what Robbie describes ... if you ar erepeatedly having to use dirty fuel, the muck must then be accumulating in the system, presumably it builds up in the bottom of the tank.

so I guess if you do become paranoid about the possibility of fuel starvation due to the muck, you could siphon it all out occasionally and filter it before putting back in the tank ?
  
Post #190261717th Jan 2018 4:49 pm
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Erea
 


Member Since: 19 Mar 2012
Location: Munster
Posts: 1509

Ireland 2006 Discovery 3 TDV6 Commercial Manual Zambezi SilverDiscovery 3

Or change your fuel filter more often than required. For the tractors here we’ve a filter on the filler hose and change it about every year. Haven’t needed to chang a fuel filter on any of the tractors since I put that in.
  
Post #190262217th Jan 2018 4:57 pm
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L319
 


Member Since: 14 Dec 2013
Location: Herefordshire
Posts: 2079

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

There is only a mesh filter on the pump pick up in the tank so any fine contaminants will end up through the pump and kill it, as was the case on my vehicle . The swirl pot will centrifuge some rubbish out but it is after the pump. Better to make sure clean fuel is put in to start with as per previous post.
I have a book about driving in North Africa desert in about 1935 and they filtered all the petrol through a chamois leather to remove fine sediment as it was put into the fuel tank
  
Post #190262417th Jan 2018 5:04 pm
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