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Thread: MOT question

  1. #1
    pwilliamson1991's Avatar
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    MOT question

    Hey I'm just wondering does anyone know the procedure for checking the fuel system during an MOT test?

    Basically wondering if a car "had" illegal fuel in it would there be any way of them telling or noticing via the emissions or anything?

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  3. #2
    S3Alex's Avatar
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    What would you be thinking of fuel-wise?

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    I assume we're talking about diesel?

    Aren't diesels only tested for smoke anyway? I imagine poorer quality fuel will be more smokey, so that might be something to consider. Even supermarket fuels made my old remapped mk4 Golf smoke more.

    I'm not sure whether the emissions would be different or not, but regardless of that, I'd be more worried about the quality of it.
    I work for a construction machinery dealer and we get diesel delivered into our tanks for filling the machines, and even though the diesel is white (a lot of customers can only run on white) none of our engineers will touch the stuff for their new vans. Even Tier4 machines are a concern when it comes to quality.
    You'd need to consider sulphur and biofuel content.

    Still assuming it's diesel, if it's ever had red diesel in it in the past then the filters will be stained red. The MOT won't check this, but if you live in a very agricultural area and you are suspected then you could get checked by another agency.
    Red diesel has very high sulphur and will knacker a modern diesel engine, so any fines would be the least of your worries. A3's need ultra low suplhur diesel.

    If we're not talking about diesel (red or otherwise) then forget everything I've said above
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  5. #4
    sliced's Avatar
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    No they don't test for red diesel... although it may or may not pass emissions
    Current: 8P3 '59 2.0 TFSI 3DR S-Line | Adaptive Bixenons with DLR's | Folding electric mirrors | Heated half leathers |
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    so ypu just told the forum your useing red ?
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    pwilliamson1991's Avatar
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    Quote Originally Posted by bez101 View Post
    so ypu just told the forum your useing red ?
    "if a car "had" illegal fuel in it"

    Not my car in particular but a friends! but interested to know the story, and yea i was talking about red.

    Also another interesting fact I read was that the sulphur content of red diesel was actually reduced to
    10 milligrams of sulphur per kilogram of fuel to compared to 1000 mgs/kg back before 2011. So it is basically (or meant to be) sulphur free now

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    Graham89's Avatar
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    Nope won't get picked up or noticed.



  9. #8
    Boon's Avatar
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    Red is exactly the same as white apart from the dye

    We burn 1 litre of the stuff every 8 seconds in our brand new MTU marine engines. If it wasn't the same quality we wouldn't be able to use it due to warrantee issues
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    danb986's Avatar
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    Red isn't the same as white, but with dyes in it anymore. It used to be, but not now.
    Red isn't available as a proper ultra low sulphur diesel, which is why our new machines can't run on it. JCB, Isuzu and Cummins all issued warnings not to use red diesel in their Tier4 engines as it will cause damage and void any warranty. Any warranty claims have to be submitted with fuel samples and the old fuel filters to verify that red diesel hasn't been used.

    Surely they wouldn't go to all this bother if red and white were the same stuff.
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  11. #10
    danb986's Avatar
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    You'd need to add expensive additives to this so called "Red ultra low sulphur diesel", to make it anywhere near the same as white ULSD, but in ensuring customers add the correct amount every time is impossible. This is why most engine manufacturers who have engines that comply with Tier4 emissions advise against using it. It'd also negate any financial benefits from using red diesel.
    I'm not sure what spec the marine engines are that you use, but the machine engines that have stopped using red are very low emission in order to comply with Boris Johnsons strict guidelines in central London and in underground tunnel applications such as CrossRail.
    pwilliamson1991 likes this.
    Now: 2010 A3 SB S-Line Black Edition 2.0TDi 140CR. Panther Black
    Retro'd: Black S-Line badges | Private Plate | Come home lights activated | Fogs as corning lights activated | Hill hold assist activated | TPMS (via VCDS) activated | 3.5" s/s tailpipe | LED interior lighting.

    Gone: 2007 A3 SB Sport TDI 140. Dolphin Grey




  12. #11
    pwilliamson1991's Avatar
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    Quote Originally Posted by danb986 View Post
    You'd need to add expensive additives to this so called "Red ultra low sulphur diesel", to make it anywhere near the same as white ULSD, but in ensuring customers add the correct amount every time is impossible. This is why most engine manufacturers who have engines that comply with Tier4 emissions advise against using it. It'd also negate any financial benefits from using red diesel.
    I'm not sure what spec the marine engines are that you use, but the machine engines that have stopped using red are very low emission in order to comply with Boris Johnsons strict guidelines in central London and in underground tunnel applications such as CrossRail.
    Always thought red was the exact same diesel only it had the red dye added :o

 

 

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