Cheap high test gas

[mort]

Originally Posted by Old Mechanic

Heed the warnings about pouring diesel in a gas tank or vice versa. Mercedes recommended adding gasoline to diesel fuel for extreme cold temp operation, but there was a big highlighted warning about pouring one into the other. I think it was diesel in a gas tank but this is ancient memory (1982). The were very adamant about the danger., and I think it is what you are doing (diesel in a gas tank).

regards
Mech

I'm with Old Mechanic, I wrote this in another thread last year:

I have another reason I'm not going to mix diesel into my gas tank. For a sealed tank, like a gas tank in a car, if there is any liquid fuel present the high partial pressure of gasoline saturates the vapor volume of the container. The saturated vapor is too rich to burn (above the upper explosive limit, UEL). Essentially a sealed gas tank with gas in it is safe. A diesel tank is also safe, but diesel has such a low vapor pressure the vapor is too lean to burn (below the lower explosive limit, LEL). But a mixture of the 2, for a wide range of concentrations of gasoline and diesel, allows explosive mixtures in the vapor volume of the canister. For extreme concentrations the mixture is safe, but at about 5% diesel the amount of gasoline that evaporates into a closed container drops below its UEL, and above about 50% diesel - 50% gasoline, the diesel vapor concentration rises above its LEL. A bad idea to mix in the same tank.

-mort

[bandit86]

Large concentrations of any fuel in the wrong tank is damaging. Too much gas in a diesel and it will cause catastrophic problems, too much diesel in a gas will smoke and burn too slow to make any power. But in small amounts, my original post said 1% there are proven benefits

[bandit86]

Originally Posted by mechman600

Diesel does not contain octane. It contains Cetane.

Octane = resistance to auto-ignite. The more there is the less likely to auto-ignite. Spark ignition engines need this so that only the spark plug lights the fire.

Cetane = ability to auto-ignite. The more there is the more likely to auto-ignite. Diesel engines need this because they rely on heat from compression (only 600F) to light the fire.

When I was a kid I put some diesel fuel into my dad's car. It wasn't much, but it WAS enough to make is run like crap...AND enough to get a beating.

Octane and cetane. Sounds different yet I means the same. Waters ability to remain liquid at cold temperature or waters ability transform to solid. Not the best argument

[rmay635703]

Red-X gas stations used to sell gasoline that has 4% diesel in it right from the pump, yes it does increase mileage, likely more then than now, but you won't see me doing it in any of my cars either.

[IsaacCarlson]

People used to steal what they thought was gas from the farm. They would pull in when nobody was home or in the middle of the night and fill their car up. They would get about a mile and it would stall. Most of them got caught because they had to walk back and call a tow truck. Of course that was straight diesel in their tank and it fouled the plugs. I usually mix a gallon or two into a 16 gallon tank. No problems.

[albyneau]

Never considered an ongoing "premix", but for goin on 4 decades I've been adding a couple quarts of #2 to my vehicles occasionally due to it's superior solvency~ it really cleans the varnish out of gas rigs, and provides lubricative properties to the top end for those projects that've been sitting around for a while....

[mechman600]

Originally Posted by bandit86

Octane and cetane. Sounds different yet I means the same. Waters ability to remain liquid at cold temperature or waters ability transform to solid. Not the best argument

Crap. I guess all my textbooks and training and years of diesel experience means squat.
That's the problem with some posts in this forum. People claiming to have knowledge about certain things based on deductive reasoning, when in fact they know bugger all.

[mcrews]

Originally Posted by mechman600

Crap. I guess all my textbooks and training and years of diesel experience means squat.
That's the problem with some posts in this forum. People claiming to have knowledge about certain things based on deductive reasoning, when in fact they know bugger all.

and dont forget any certificates that you have framed......!!!!

[markweatherill]

I guess a little oil, of some kind or other, would act as an 'upper cylinder lubricant'. At least diesel fuel is designed to go in engines.

[mechman600]

Originally Posted by mcrews

and dont forget any certificates that you have framed......!!!!

How could I forget? Those are the most important!