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7.3L IDI Diesels (Not Power Strokes) Technical discussion of topics related to vehicles powered by the 7.3 Liter In-Direct Injection Navistar engines.

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Old 04-18-2009, 03:36 PM   #1 (permalink)
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Mixing gas and diesel

i seen a guy in an 18 wheeler with both gas and diesel nozzles filling up his tank. whats up with that?
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Old 04-18-2009, 06:22 PM   #2 (permalink)
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Maybe he screwed up...... was it in the same tank.
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Old 04-18-2009, 06:53 PM   #3 (permalink)
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Was it two different hoses in one tank or one hose in the left tank, one in the right tank?

At truck stops there are main and slave pumps, both pump through the same meter so you can fill both left and right tanks at the same time.

If it was actually gas and diesel, some old school folks will run a mix of gas and diesel (mostly diesel, just a bit of gas) to help with fuel gelling in cold weather. Or the guy just screwed up and will be making expensive repairs in the near future.

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Old 04-18-2009, 07:41 PM   #4 (permalink)
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maybe has a seperate generator that runs on gasoline?....just a thought
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Old 04-19-2009, 12:46 AM   #5 (permalink)
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i seen a guy in an 18 wheeler with both gas and diesel nozzles filling up his tank. whats up with that?
I do that all winter long, 1:4 mix with regular diesel, I add some lubricity additives too tho as gas is a dry fuel and does nothing good to the IP or injectors. I can start my truck on the on just one cycle of glowplugs after a full night of -5F temperatures and nasty winds with no heater plugged in.

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maybe has a seperate generator that runs on gasoline?....just a thought
That's very good suggestion, with the idling laws getting stricter and stricter more and more trucks out there have APUs to keep the cab warm and lit with the main engine off.
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Old 04-19-2009, 08:12 AM   #6 (permalink)
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maybe has a seperate generator that runs on gasoline?....just a thought
he could of had a gas gen mounted to the frame of the truck,but i have never seen gas pumps at the same fuelling spot as diesel,to many drivers would screw up and put gas in there tanks by mistake.
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Old 04-19-2009, 12:58 PM   #7 (permalink)
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I have a Chiltons diesel manual that says up if you accidentally put gas in your tank, you can top it off with diesel and run it as long as there in no more than 30% gas. I wouldn't try it myself, but they say it won't do any harm
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Old 04-19-2009, 09:27 PM   #8 (permalink)
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I run a 1 gallon of gas to about 9-10 gallons of diesel in the winter which for sure helps with fuel line freezing and gelling. thats an interesting story though, I'm sure its not good to run such a dry mix in those large of engines; I know my cat wouldn't like it
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Old 04-20-2009, 08:47 AM   #9 (permalink)
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and it was at a regular store not a truck stop thats why he was able to use both at the same time. he used the gas nozzle from the pump on the other side and diesel on his side
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Old 04-20-2009, 10:40 AM   #10 (permalink)
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sounds like he has a generator to me my brothers pete has a gas gen on it becuase its so much quieter than the diesel gen.
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Old 04-20-2009, 09:27 PM   #11 (permalink)
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i got pretty close to the guy without being too nosey but he was putting both in one tank. Several people in my fam own a logging business and they didnt know why either. The two women that i know that works at the store asked me "why is he mixing them"
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Old 04-20-2009, 09:36 PM   #12 (permalink)
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o into one tank then i don't know haha
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Old 04-20-2009, 09:44 PM   #13 (permalink)
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o well
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Old 04-21-2009, 12:19 AM   #14 (permalink)
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Well, if he was heading up north or up in the mountains to a place where it still gets pretty darn cold overnight, that's his way of ensuring his fuel won't gel up. The fuel down south ain't like the one we use here between fall and late spring, y'all run on what we call summer blend all year long, whereas we have to switch to avoid gelling. There are many folks who at some point filled up down south, then drove up here without refueling along the way (easy if you got an external tank), pulled up in a hotel for the night and in the morning realized the fuel ain't quite as liquid as it was the day before... An 18-wheeler usually gets about 6mpg when loaded (many can do better), so even with two 150-gal tanks he's good for 1800 miles which is more than enough to get from TX to Canada. This past X-mas I was down to New Orleans picking up a car, on my way back to Detroit I filled up both tanks and then six plastic 6-gal fuel jugs, and I pre-mixed gas and diesel 1:4 in all of them - I drove all the way to MI on that fuel, not only was it cheaper this way but also I never had issues with gelled fuel and frozen pumps and all that good stuff.
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Old 04-21-2009, 12:43 AM   #15 (permalink)
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I put 24 gallons gas in a 38 gallon tank in my 99 PSD, up in the Yukon by mistake, ran 250 miles on it, just a knocking and no power. Had to go back to WhiteHorse a 100 miles before I found out what I had done. 15,000 miles since then and no problems so far. Was pulling a 30ft.5er then

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