| Re: [GMCnet] Diesel in gasoline to help stem vapor lock??? [message #94870] |
Fri, 06 August 2010 14:59  |
Gary Casey
Messages: 448
Registered: September 2009
Karma:
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Senior Member |
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As Emery said below, the addition of diesel fuel will reduce the octane of the
fuel. Actually, by a lot. Diesel fuel has an extremely low octane rating -
it's literally below zero. So mixing it with gasoline, even in small
quantities, will likely lead to detonation if the engine is anything close to
being knock-limited. I certainly wouldn't consider it.
Gary
>
> My dad has a 62' Chrysler Imperial that is experiencing vapor lock and other
>boiling/hot gas issues we sometimes do in our GMC's. A mechanic is his area of
>the East TX hill country (that works on antique Detroit iron) has recommended
>that he put about a quart of diesel fuel in a tank of gas to help
>alleviate/solve that issue (told to me second hand by my mom.) I think he needs
>to address other issues first, but I thought I'd ask this community if anyone
>has heard of this "solution" before and if it would work for our coaches. It
>sounds too simple to be effective; a bit like the "add a few ounces of acetone
>to your gas to increase your gas mileage." But then again who would think that
>allowing a duck or goose to stuff itself on corn or millet would ultimately give
>you something as yummy as foie gras?
>
> Regards,
> Rick
>
These things certainly do have a habit of recycling on the GMCnet.
About 2 years ago (July 2008) this subject came up.
I found my reply:
>
> I did a search on the Internet about this. I have found several suggestions
>to add a quart of diesel to a tank of gasoline (for an automobile probably about
>1 quart per 20 gallon tank).
> They claim it does reduce the vapor pressure of the mixture and therefore helps
>prevent vapor lock.
>
> However, I have also read warnings that oil (Diesel fuel is oil) mixed into the
>gasoline can harm some of the gaskets and seals in the fuel system. That makes
>sense as oils will cause rubber swell in most elastomers (synthetic rubber
>compounds commonly found in fuel pumps and carbs, etc.
>
> Another thing that I have read in a couple of places that adding diesel fuel to
>gasoline will reduce the octane number. This could lead to knock or pinging.
Emery Stora
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