Fuel -- How old is too old?
Well I said that I was going to put that old diesel fuel (from 2005) in my truck a year ago. I got around to it yesterday. I put 10 gallons of old fuel into around 75 gallons in my auxiliary fuel tank. It really smelled bad, but I figure that if somebody can run waste motor oil, I can run 7 year old diesel. I am leaving for Mexico on Tuesday, where I will fill my tanks, including the 2 five gallon jerry cans. I'll try to use the newer fuel sooner, but no promises 
Mark

MarkB. I won't need one
c. What makes you think 10 gallons in 105 (75 in the auxiliary, 30 in main) would do anything?
D. Put your money where your mouth is?
E. Sheesh!!!...Mark
boy o boy there is a lot of worry warts out there. Just carry extra fuel filters with you. You guys do run them don't you. I have made vegetable oil & used 10 micron filter with no problems. If you want to really clean your tank run some mix vegetable oil per diesel secret. It will plug filters very fast for the first 2k after that the tank will be clean.
Just a report, besides my wiper and tire problems, the engine has run flawlessly for the past 500 miles or so, but I want to thank you for your support and pessimism, I could not have done it without it. For everyone else, 7 year old diesel, mixed into many gallons of year old diesel (bought in july 2011) runs beautifully. I plan on filling up before I cross the border tomorrow, I only put a 1000 miles on her in the past year because of knee surgery and faily severe illness, but I plan on rectifying that in the coming years. (many I hope)...Optimistic Mark
When I bought my truck, I hadn't read any of the many worry threads and didn't know I was supposed to worry about dated tires, old fuel and carrying a spare everything when you drive further than across the street. The truck had set for over 5 years when I jump started it and drove 120 miles. Over four years ago, I bought a wrecked truck that had been sitting a couple years that started right up. In the bed of the truck was a 150 gallon tank of red diesel that I "heard" ran just fine.
I have run lots of old fuel, my Cummins sat for 2 years with a full tank, burnt just fine. That is nothing though, I have burnt large amounts(200 gallons) of 20 year old fuel that was sitting in the underground tank of a closed storage site we did a site clean up on. The Cummins loved it.
I have also fed it and my other diesels lots of scrap fuel, and jet a-1. Never had an issue but our regulations on fuel quality are alot tighter than stateside and have been for quite some time.
I have personally have never seen the oh so famous sludge in a tank ever, every diesel pickup fuel tank I have ever been into was squeaky clean, usually no water either.
Usually I run no additives at all and it has only once been a problem in the last 10 years, I do run 2 stroke in my mechanical engines when I remember to as it does help fuel mileage. My PSD F250 it doesn't help, but it also has 25,000 hours on factory injectors....
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I have also fed it and my other diesels lots of scrap fuel, and jet a-1. Never had an issue but our regulations on fuel quality are alot tighter than stateside and have been for quite some time.
I have personally have never seen the oh so famous sludge in a tank ever, every diesel pickup fuel tank I have ever been into was squeaky clean, usually no water either.
Usually I run no additives at all and it has only once been a problem in the last 10 years, I do run 2 stroke in my mechanical engines when I remember to as it does help fuel mileage. My PSD F250 it doesn't help, but it also has 25,000 hours on factory injectors....
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Diesel can last forever, we had a 100 gallon tank that sat in a barn for about 30+ years. When we pulled the top off it was packed full of algae(red kind?). After pumping it out from the hand crank the stuff looked like orange tar. We ended up putting a 150F heating element into the tank and let it sit for a few days. Took a cheese cloth and put it around a rather large swifter and started to pump the diesel into 55 gallon drums. We ended up with about 80 gallons for a redish/ clear diesel. Dumped some additives in it and it and we were good to go! I think a lot of that red color was due to the rust from the tank.
We rolled the 100gal tank to a middle of a field and threw a match in it. haha.
We rolled the 100gal tank to a middle of a field and threw a match in it. haha.
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