Diesel Filter Is Black
- Thread starter Compo1
- Start date
All this supermarket fuel vs normal fuel is almost certainly a load of crap, it all comes from the safe refineries, the only thing that could perhaps differ is storage but I don't it differs that much. I changed my filter on my pd105 BLS engine 105bhp 1.9tdi and it was also black, not worried on bit continue to do 1000 miles a week on tesco ful like i've been doing for the last 18 months 
No it isnt. I've even seen the growths that can grow in tanks off bio fuel, also the water in the diesel due to it not having the right adertives' which is also down to the price too.
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Also found in my 3.0 v6 petrol Audi I had, the fuel burnt off quicker so less miles per gallon with asda fuel than buying she'll or BP fuel which I got more miles too,
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It's been well documented and proven by various sources that premium fuel is superior to supermarkets own branded stuff.
The tanks are compartmented for transportation and the fuel mixed with the appropriate additives to thin (supermarket) or improve (shell, BP, some premium supermarket fuels such as tesco 99) the end product.
Black fuel on a pd engine is usually down to 1 of 2 things:
-cross oil/fuel contamination from a failed fuel pump gasket
-blow back past the injector seals which contaminates the fuel with carbon
removal of some of the fuel and a settle test can confirm which problem is present.
The tanks are compartmented for transportation and the fuel mixed with the appropriate additives to thin (supermarket) or improve (shell, BP, some premium supermarket fuels such as tesco 99) the end product.
Black fuel on a pd engine is usually down to 1 of 2 things:
-cross oil/fuel contamination from a failed fuel pump gasket
-blow back past the injector seals which contaminates the fuel with carbon
removal of some of the fuel and a settle test can confirm which problem is present.
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