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Old 08-07-2012, 12:54 PM   #1
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Smile Diesel fuel

Hello, I was told to had a quart of automatic transmision fluid to you diesel it will grease the inner motor part, how true is this? and also told me if we're park for a while to top the fuel tank to keep humidity out, cause this is all new to me.
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Old 08-07-2012, 01:05 PM   #2
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Hi and welcome to the forum.

Adding ATF to the diesel tank is a new one on me. I haven't heard it come up before but we'll see what our experts have to say on the subject.

It is a good idea to fill the tank before storage I believe... for the reason you were told.

BTW, you might want to go into your forum profile and add the type of coach, engine, and year to your signature line. That way, people who read your questions will know what rig you're asking about.

Best of luck and we're glad you found us.

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Old 08-07-2012, 01:11 PM   #3
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Do believe it was an old truckers trick for the older mechanical injection systems.. Not needed today..

Some people actually run A LOT, if not straight, tranny fluid.. Automatic Transmission Fluid Fuel - Alternative Diesel Fuel - Diesel Power Magazine
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Old 08-07-2012, 01:14 PM   #4
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That would only help if you got fuel that didn't include the right additives. There was a test a few years back that showed which after market additives worked best. BUT they used fuel that didn't have the lubricity additives in it. Here's a summation of the testing
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Old 08-07-2012, 01:49 PM   #5
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Clearances in the new HPCR diesel fuel injection systems are measured in light bands. Among the additives in ATF are friction modifiers to prevent or control slip. While old-timers used to throw all kinds of stuff in diesel fuel tanks (e.g., ATF, used motor oil, etc.), it is definitely NOT RECOMMENDED for today's modern engines.

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Old 08-07-2012, 03:26 PM   #6
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That raises a question. I see that the Thor manual says ultra low sulfur diesel fuel for 2013 coaches that also require the use of DEF. then I was surprised at a gas station to see two different prices for diesel, with of course the ultra low sulfur variety more expensive.

So is the ultra low requirement strictly to meet legal pollution control requirements or will there be a negative impact to the engine for not using it?
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Old 08-07-2012, 03:31 PM   #7
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.... then I was surprised at a gas station to see two different prices for diesel, with of course the ultra low sulfur variety more expensive.
Where were you when you found 500 ppm low sulfur diesel still on sale at a pump? As of December 1, 2010, all highway diesel sold in the U.S. must be 15 ppm ultra low sulfur diesel.

Are you certain that you weren't seeing on-road and off-road (dyed) diesel at the 2 pumps?

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Old 08-07-2012, 03:50 PM   #8
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One problem with using ATF in your fuel...Is that if you get stopped for fuel inspection....Your fuel will now have dye in it and they will assume that you are using OFF ROAD FUEL To Evade The Fuel Tax....

One of my co workers got caught using off road fuel in his diesel pick up and the Judge fined him $5,000.00....And told him ...It will be $10,000.00 next time....He is a believer now...

Use your own best judgement!..
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Old 08-07-2012, 03:52 PM   #9
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I have a 1993 Cummins C8.3 with mechanical fuel injection. The owners manual does say that I can add up to 5% motoroil to the fuel tank. It says nothing about ATF. As others have said, you probably don't want to do this on the newer motors.

Some of the old timers on this and other sites tell me I need to be using some sort of additive to lube the mechanical fuel injection as the ultra low sulfer diesel doesn't have good lubricating properties. I use a product called Diesel Kleene (the one with lubrication additive), that I can buy most anywhere. All the Walmarts sell it. It was recomeneded by a fellow on this board that also has a truck fleet. He said he used old motor oil in his fleet trucks, but used Diesel Kleene in his personal motorhome.

Filling the tank is a good idea for the reason noted. Plus, having a large volume of fuel seems to slow down the degredation process.

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Old 08-07-2012, 03:58 PM   #10
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diesel fuel

Thx e1, my rig is a 1999 discovery with a 300hp diesel, I probably don't need to add any addictive to it.

Elmer & Norma Lang
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Old 08-07-2012, 04:00 PM   #11
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Quote:
Originally Posted by RustyJC

Where were you when you found 500 ppm low sulfur diesel still on sale at a pump? As of December 1, 2010, all highway diesel sold in the U.S. must be 15 ppm ultra low sulfur diesel.

Are you certain that you weren't seeing on-road and off-road (dyed) diesel at the 2 pumps?

Rusty
Thanks. It was actually the same pump at a new gas station in Aiken, SC. Two different prices. Now I am wondering if it meant something different like cash vs credit. I will have go there again to verify.
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Old 08-07-2012, 04:02 PM   #12
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1996 Monaco Signature Series with a M11 Cummins 450plus

I have been running Howes Fuel Lubricant in mine for some time now. I was told the same info. The older engines struggle with the new fuel. Some still say that this is nonsense and the new fuel is fine. The Howes seems to work well in my engine. I have a little more pick up and I am getting slightly better MPG

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Old 08-07-2012, 04:03 PM   #13
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I just remembered that during orientation... at a large trucking company that I drove briefly for....They told us that we all were supposed to carry spare fuel filters and ATF with us on our truck....

When we had a suspected clogged fuel filter ...We were to change it ourselves and prime the filter with the ATF...The Safety guru said that it help clear the lines and injectors...
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Old 08-07-2012, 04:05 PM   #14
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Originally Posted by elang View Post
Hello, I was told to had a quart of automatic transmision fluid to you diesel it will grease the inner motor part, how true is this? and also told me if we're park for a while to top the fuel tank to keep humidity out, cause this is all new to me.
If you are going to be parked for a lengthy time, consider adding fuel stabilizer also.
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