Why would having more gasoline in the tank make it cooler? *Adding* gas would certainly cool things down, but that would be a transient effect. Keeping the tank full will increase the thermal mass and reduce the *variability* of the temperature, but it seems to me that--depending on the change of outside temperature--it would be as likely to raise the fuel temperature as to lower it. No? --Pete Lucas VIN #06703 On Sep 14, 2004, at 11:10 AM, Rod Dillman wrote: > The postings about fuel temperature in the gas tank cause me to > believe a theory and practice that I have had may be valid. I have > always felt that heat helps to shorten the life of a fuel pump. It has > always been my practice to try and keep my fuel tank at least half > full, the theory being that the more gasoline that is in the tank the > cooler it will be. In a DeLorean a half full tank is only 6 or 7 > gallons, in one of my Cadillacs half full is 13.5 gallons since it has > a 27 gallon tank. I believe that the relatively small tank on the > DeLorean makes it even more important to fill up often in order to > lower the tank temperature especially on hot summer days and > interstate driving. While I have no proof that a fuller gasoline tank > is better for the fuel pump, the practice has little down side other > than causing a few extra stops which your lady will appreciate. To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/