Low Outside Temp - Petrol in diesel - Babygotoo
Morning,

At what temperature would you consider putiing a small amount of petrol in a tank of diesel to stop it waxing?

And what amount of petrol in a 60l tank of diesel.

Thanks in advance

Ellis
Low Outside Temp - Petrol in diesel - Armitage Shanks {p}
I don't think it would ever be necessary, in UK. Even if it did get very cold, I wouldn't do it. See the long running thread re petrol in a diesel and the costs of repairs + rejected warranty claims. Could you cost you £Thousands as you would have voided the warranty, particularly if we are talking common rail systems.
Low Outside Temp - Petrol in diesel - Babygotoo
Forgot to mention, Merc C220D '96, so should diesel be ok down to at least -10C

Thanks


Ellis
Low Outside Temp - Petrol in diesel - Armitage Shanks {p}
Relevant post, re diesel problems, at

www.honestjohn.co.uk/forum/post/index.htm?f=4&t=46...7

Most 'winter' diesel has additives put in it to prevent the waxing problem SFAIK


Low Outside Temp - Petrol in diesel - jc2
In the "old" days 10% was recommended but this would cause problems with modern pumps;modern diesel sold in the winter has anti-waxing additives already added and most modern diesel cars have a fuel heater fitted as part of the filter assembly or close by.This heater is triggered by fuel temperature and will normally switch on below 36F/2C deg..
Low Outside Temp - Petrol in diesel - jc2
I should also add that aftermarket fuel heaters are available for older cars.Simple to plumb and wire.
Low Outside Temp - Petrol in diesel - cheddar
Modern diesel fuels contain anti waxing agents that avoid the problems that farmers and the like experienced 30 + years ago once the temp got below - 5 degC. Equally modern diesel vehicles rely on the lubricity of the fuel to lubricate the high pressure pump(s) and other system components, the benefit over older tech diesels is a massive improvement in efficiency, power, torque, and refinement.

Dont put ANY petrol in a diesel vehicle's tank!
Low Outside Temp - Petrol in diesel - DP
My Mondeo has a diesel engine with a basic design dating back to the mid 80's and I can confirm that it starts "on the key" in -8°C (the coldest it's been since I've had it).

I don't think anything the British climate ordinarily throws at us will trouble any half modern diesel running on good quality fuel.

Cheers
DP
Low Outside Temp - Petrol in diesel - oilrag
Summer Derv is ok to -7c and winter to -15c
So no need to add anything
Low Outside Temp - Petrol in diesel - jc2
Not only better fuel and heaters in the fuel system but most modern systems recirculate the fuel thro' the pump and engine compartment and pick up some heat that way unlike the old in-line pumps(minimec) etc which did not re-circ and were constantly taking in cold fuel.The waxing usually blocks the very fine filters used on diesels.
Low Outside Temp - Petrol in diesel - Number_Cruncher
Mmm, I remember helping to light small fires under the diesel tank of my father's AECs in the winters of the 1970's, to get some heat into the waxing fuel. I suspect there might be health and safety concerns about doing that now!

At the time, this was one of the big advantages of the Cummins PT system, because it fed the fuel back to the tank, the fuel in the tank was heated by the engine as the truck drove along, so these engines were very resistant to fuel waxing.

Number_Cruncher
Low Outside Temp - Petrol in diesel - Babygotoo

Thanks, no petrol needed then!
Low Outside Temp - Petrol in diesel - Aswan
No, because after the *disaster* of having most of the diesel vehicles in the country wax their filters during a cold snap about 20 years ago,
new British Standards for Derv were brought in.
They are no filter plugging ( for fuel supplied)to minus -7c in Summer and -15c in winter.
Low Outside Temp - Petrol in diesel - jc2
If you go up towards the Arctic you will still see this done;also left idling overnight-if they're in a town they plug in a block heater and a fan heater to keep the engine(and pump/filter)warm.
Low Outside Temp - Petrol in diesel - Group B
At the time, this was one of the big advantages of
the Cummins PT system, because it fed the fuel back to
the tank, the fuel in the tank was heated by the
engine as the truck drove along, so these engines were very
resistant to fuel waxing.



Reminds me of when I was a kid in the late '70's/ early '80's, my Dads mate was a lorry driver. In winter for his company the drivers used to take turns to go down the depot in the middle of the night to start the lorries up and let them run for a bit "to warm the tanks". One day he asked me if I wanted to go with him that night, at 2am, sub zero temperatures, ten mile round trip, but I declined his kind offer...


Low Outside Temp - Petrol in diesel - autumnboy
Many a time in the winters of the 60's and 70's when I was an apprentice.

I was often told in the mornings to go around the Scammell's in the yard and start them, ready for coming into the workshop for repairs etc. and most often the only way to start them even after using the cold start on the Gardener engines, was to sit on the wings or mud guards and light a roll of news paper and hold it near the air intake on top of the engine, while your mate turned over the engine and started it.

We always tried to avoid using "Easy Start" an ether base spray, as that could damage engines if used wrongly.

Many good memories of being an apprentice fitter in the good old days, not as an trainee technician as they are so called today in nice warm workshops with coffee machines, etc..


oooops


Low Outside Temp - Petrol in diesel - jc2
I remember someone starting an engine in this way;rag soaked in paraffin,lit and held at the air cleaner intake while someone else cranked.Engine started,so he put rag on ground and stepped on it to extinguish it-minor problem,crepe soled shoes,man tearing around trying to pull off a shoe with a flaming,paraffin soaked sole.
 

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