Milky blue diesel in fuel filter

[jdk]

Hi, I have just changed the fuel filter on my 05 A4 2.0 TDI avant 140 as it was suffering from a slight hesitation when accelerating out of sharp uphill corners, the fuel that came out of the filter was a milky blue in colour! Has anybody experienced this? It has been suggested to me that it could have accidentally had petrol in the tank in the past, not sure how this would turn the diesel that colour though!

A bit of guidance would be appreciated.

Cheers.

[Sam]

Diesel should be anything from clear to amber to light brown.

Milky diesel suggests it's mixed with something - probably water.

[jdk]

Diesel should be anything from clear to amber to light brown.

Milky diesel suggests it's mixed with something - probably water.

I thought that but it was just a strong blue colour that you couldn't see through in a glass jamjar, thanks for your reply though.

John.

[zollaf]

this is interesting. where do you live for a start, just roughly, to rule out dodgy tax free diesel. can you post a pic of it as well.

[Sam]

Ah, when you said milky blue, I saw milky white with a dash of blue colouring.

If it's strong blue, then it could be something more sinister. IIRC blue is marine/heating/aviation fuel across Europe, no idea what it's used for in the UK though.

Are you filling up from large chains or small independents?

[Guest 2]

Ulsterbus in NI use blue diesel in their buses - so if you're not from NI it can't be that but the blue certainly isn't normal.



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[jdk]

Ulsterbus in NI use blue diesel in their buses - so if you're not from NI it can't be that but the blue certainly isn't normal.



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In the Isle of Man, I've only ever used main garages for fuel, shell and total, I've never noticed or heard of it being blue though.

John.

[Eshrules]

In the Isle of Man, I've only ever used main garages for fuel, shell and total, I've never noticed or heard of it being blue though.

John.

Have you got a picture of the fuel? Presumably you've got it stored if it was in a jamjar?

[jdk]

Have you got a picture of the fuel? Presumably you've got it stored if it was in a jamjar?

Unfortunately not, i tipped it into a barrel of waste oil.

[wigebo]

just searched google found this thread.i searched because my wife complained my 2007 audi 2.0tdi was idling roughly and missing.just changed my fuel filter and shocked to see the diesel was dark blue almost black in a jam jar.put £20 worth of diesel in couple of days before from morrisons ebbw vale when the tank was empty.wondering if this was the problem?