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  1. #11
    Smiling Down On Youse SurferJoe46's Avatar
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    May 2005
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    Default Re: diesel in the petrol

    It depends on the percentages of the wrong fuel in the tank.

    Much too much diesel in a gas engine will destroy it as it burns longer, hotter and will fry the exhaust valves and make the exhaust manifolds glow bright red. Seen it. Once running on diesel, a gasoline engine is VERY HARD to shut off as typically a gasoline engine (with a carburetor) will not stop flowing fuel, but it will also not require ignition to keep it running as internal engine parts are by then glowing hot enough to sustain ignition of the diesel fuel.

    Gasoline in a diesel is just about as dangerous, but in different ways.

    It will NOT lubricate the injection pump (if it has one) or the injectors or their pintles and it is thinner in viscosity and is therefor less controllable in the system. Gasoline has a much lower cetane value and it will "knock" dangerously and can damage the piston tops, rod bearings and piston pins, crack rings and ring-lands, even damaging the glow-plugs (again, if it has them) and any pre-combustion chambers that the engine may use.

    I've never heard of putting gasoline into diesel to make it less susceptible to freezing. Usually, stations just sell a lower-paraffin content fuel in colder months as the paraffin wax is the agent that coagulates and falls out of solution and creates a mass of rather "sand-like" precipitate in the bottom of the fuel tank. It is unpump-able and the lift pump will run dry and the system will lose prime and cease motivating.

    "White gas" is another old-wive's tale to add to the mystique of keeping diesel fuel from freezing. Don't do it either.

    Just use Diesel #1 in colder weather. Diesel #2 is for use in regular temperatures.

    The only "bollocks" involved here is lack of thermodynamics knowledge.


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  2. #12
    tweakedgeek tweak'e's Avatar
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    Dec 2004
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    winterlessnorth (well almost)
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    Default Re: diesel in the petrol

    quite right there joe.
    talking to 4x4 guys and mechanics, it surprising how many late model diesels are dieing from poor fuel. common culprit appears to be water but the old nasty trick to control water was to pour methanol in (which soaks up the water but also allows the water to get through the fuel filters).
    i'm wondering just how many are getting a bit of petrol mixed in there to. with small amounts of petrol in diesel you won't notice but the very high pressure injection system will wear out fairly quick.
    Tweak it till it breaks

  3. #13
    Short Member pcuser42's Avatar
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    Apr 2006
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    Default Re: diesel in the petrol

    We had a friend who accidently filled his diesel vehicle with petrol

    We were on a 4WD holiday in Fox/Franz Joseph (one of them ), and since all 4 vehicles were diesel, there is always a race to the pump. After winning , this guy picked up the wrong handle.

    We only realised this when the truck broke down on a 4WD track. A few drops of fuel were extracted (which smelt funny). Dad was a little suspicious, until he set it on fire - WOOSH! Diesel doesn't burn like that.

    At the same station (different day), another vehicle paid for diesel, but hadn't actually filled up
    "He who resorts to personal insults hath lost the argument."

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