So today I was speaking to some guy I was doing work for and we got talking about blanking off the egr valve/s. He blanked his off, made it himself. One thing that came up in the discussion was about the fuel filter and injectors. He told me his mechanic advised him to fit a secondary fuel filter which he did, the reason being he said was that dirt can still get into the injectors and by fitting a second one there is much less chance of getting be injectors dirty and saving big costs in the future. I don't know what the facts are behind this or if it would actually make a difference but he suggested if I found a place to fit it then to fit a second one in.
The way he fitted it in was the hose that leaves the fuel filter goes into the secondary filter instead of the fuel pump and the from the secondary fuel pump the outlet hose goes into the fuel pump.
What are your thoughts on this and if it is a good idea would it be something easy to do (would there be space to fit a secondary fuel filter)?
Here's a photo I took of his two fuel filters after I had a look around his engine.
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25th Jan 2017 7:40 pm
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Yes, multiple filters is not a problem as long as it doesn't restrict fuel flow and it makes sense that the first filter catches most things and second filter catches whatever is missed.
Some trucks have multiple fuel filters and if travelling to extremes of civilisation like Brentwood then an extra filter makes sense as you never know how long the diesel has been standing before it gets pumped into your car. Bodsys Brake Bible
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25th Jan 2017 8:21 pm
zinke
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Pretty much all tractors have 2 fuel filters, one course and one fine and normally a water bowl on the bottom of one so you can see any water in there. I also have filters fitted to the storage tanks that trap water as well as dirt.
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25th Jan 2017 10:38 pm
Azzybee
Member Since: 04 Jul 2016
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Ok so sounds good. Anyone know of anyone who has installed a secondary fuel filter?Discovery 3 HSE 2007
26th Jan 2017 12:49 am
lynalldiscovery
Member Since: 22 Dec 2009
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I can tell you 100 percent the extra filter he has fitted was obsolete years ago(crosland 522 or its equivelant and theres load all the sameish idea) when I was using them, I bet if you find how many microns it filters down to the std fit l/r filter is most likely better than the one hes fitted, so it may work as a pre filter to help the main filter last longer but having it after the main is kind of pointless.
A lot of the trucks we see have twin filters but they nearly all run the same main filter and the extra filter is before this and is mainly to catch the bigger debris and water.
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Sounds like an effort to fix a problem that doesn't exist but introduces complications that could make the vehicle undriveable or more prone to failure.
So no, not recommended by me.
If you see this chap again you should mention the fire risk with his installation and recommend he sees a mechanic for rectification. Diesel has a much lower auto ignition temperature than petrol so the threat is real.
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Last edited by Robbie on 26th Jan 2017 9:48 am. Edited 1 time in total
26th Jan 2017 8:32 am
Azzybee
Member Since: 04 Jul 2016
Location: UK
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I will be seeing him next week and show these comments to him. I'm sure he will take on board what you have to say. Discovery 3 HSE 2007
26th Jan 2017 9:25 am
Robbie
Member Since: 05 Feb 2006
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As a minimum get him to replace the jubilee clamps with ear clamps or similar. Ideally change to a fuel hose with internal braiding rather than an over-braid. Whilst it is not clear in the picture if he has one side of the pipe on the block side and the other on the chassis side the movement of the engine will have to be accounted for with a suitable amount of flex and additional primary support points (the fittings should not provide the primary support if there is movement).
It's probably a good lesson in how a seemingly innocuous change in the fuel system can bring consequences. Given that the filter's performance will be compromised by engine vibration he may want to think about reverting to standard.
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Thanks I will let him know and I will have a look at the link now Discovery 3 HSE 2007
26th Jan 2017 3:36 pm
lynalldiscovery
Member Since: 22 Dec 2009
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Another good read, note the comment halfway down main fuel filter not to be prefilled, er thats what weve been doing for years
That comment also say filter is 3 micron.
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Was just about to say that but then it's a standard spin on thread so a better filter can easily replace it. Imo all diesel and oil filters should still be spin on as they just work so much better!!
Ideally you'd want the lowest micro filter you could find for the fine filter that doesn't restrict flow too much that it causes issuesFFRR Owner, very nearly became a D3 owner
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26th Jan 2017 7:27 pm
lynalldiscovery
Member Since: 22 Dec 2009
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Over recent years just about all the trucks have changed to paper only type fuel and oil filters, pretty much the same as cars and vans.
The filter posted in the ops pic isnt a spin on filter but is held on with a central bolt from the top, they can be a pita to get all the seals to stay in place as you tighten them up, especially if space is restricted.
26th Jan 2017 9:23 pm
kp
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It doesn't look like that to me, that central bolt size is far too small. Are you sure that's not just an air bleed method? Which also raises another point for me. When you change the filters you'll put a bit more strain on the system priming it and faffing drawing the air out of it..FFRR Owner, very nearly became a D3 owner
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