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Old 02-02-2015, 07:02 AM   #43
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Thanks for all the responses. I see that opinions differ. the only reason I leave mine at idle is if I have to pull up to fill the DEF in the rear. Otherwise I shut it down. It the case of the fuel door key, I have it on a separate key ring hanging on the dash.
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Old 02-02-2015, 10:03 AM   #44
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My concern about leaving it to idle would be throwing a CEL. I know we're talking diesel and not gas, but with all of the DEF components on the newer engines, it's still a concern for me. I brought this up in another thread, but have yet to see any real info on triggering a CEL for removing the fuel cap.
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Old 02-02-2015, 10:06 AM   #45
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I came across a very cool presentation as a result of doing a web search:

http://www.rvforum.net/staticfiles/C..._FMCA_0805.pdf

It covers a lot of interesting topics related to diesel engines, including the idling issue (page 32).

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Old 02-02-2015, 10:21 AM   #46
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Quote:
Originally Posted by DeWat View Post
My concern about leaving it to idle would be throwing a CEL. I know we're talking diesel and not gas, but with all of the DEF components on the newer engines, it's still a concern for me. I brought this up in another thread, but have yet to see any real info on triggering a CEL for removing the fuel cap.
A diesel doesn't use vapor collection or any lines from the fuel tank except liquid collection like gasoline engines do. Opening the fuel tank while engine is running won't throw a CEL. To leave the engine running while fueling is just wasteful and polluting, annoying to others fueling nearby, etc.
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Old 02-02-2015, 10:32 AM   #47
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Is It OK to run Generator

Much of my travel will be in hot to very hot weather. I intend to run the generator and at least one AC while on the road. Is it considered appropriate to let the generator continue to run while fueling?
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Old 02-02-2015, 10:36 AM   #48
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Much of my travel will be in hot to very hot weather. I intend to run the generator and at least one AC while on the road. Is it considered appropriate to let the generator continue to run while fueling?
I'm sure you'll get opinions both ways, but consider trucks with refrigeration; do they shut down the refrigeration while fueling?
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Old 02-02-2015, 12:24 PM   #49
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Originally Posted by BFlinn181 View Post
A diesel doesn't use vapor collection or any lines from the fuel tank except liquid collection like gasoline engines do. Opening the fuel tank while engine is running won't throw a CEL. To leave the engine running while fueling is just wasteful and polluting, annoying to others fueling nearby, etc.

I run the generator, if necessary when refueling as it does not have DEF.
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Old 02-02-2015, 12:47 PM   #50
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Most M/Hs sit for long periods and have gunk on the bottom of the fuel tank. Fueling will stir that up and the running engine sucks it up. That could shorten your filter life.

I managed a fleet of industrial diesel machines in heavy debris conditions. They overheated and shut down almost daily, never lost a turbo charger.
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Old 02-02-2015, 01:03 PM   #51
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I shut down for fuel, and let it idle to drain some coffee.
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Old 02-02-2015, 01:08 PM   #52
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You return coffee to nature as it makes things bad it you try to keep it...
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Old 02-02-2015, 03:23 PM   #53
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Most modern diesels say they shouldn't be left idling for a multitude of reasons, I'm guessing mostly because of emissions. I check my temps all the time via a SilverLeaf computer program. By the time I exit the freeway and enter a fuel station, my coach has cooled down. Even exiting a freeway into a Rest Area, my coach is cooled down by the time I stop.

For those who say it's better to leave it running because it continues to cool down, what do you do at your destination....let it run all week because you don't want to shut it off.....of course not!
Lastly, I don't fuel at truck islands and pay .30-.40 cents more a gallon, so I don't like people in passenger cars to have to listen to my diesel running while fueling. I don't like hearing it either.
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Old 02-02-2015, 03:31 PM   #54
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Always shut it down. Worked for an agency that had a large fleet. The fleet folks determined that the engines would last longer with less problems if the engine idled less.

The guideline/rule came out that if you were parked for more than 5 minutes you were to shut the engine off.

We rented the vehicles from fleet and paid directly for the fuel but not for the oil or repairs.

Fleet was a penny pinching bunch so they would not have asked to shut the engines down if it did not make them money.
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Old 02-02-2015, 04:22 PM   #55
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Cummins says to let their engines idle 3-5 minutes after immediately exiting an interstate or heavy pulling. I don't know anyone who can exit a freeway/interstate, drive to a fuel station, pull up to a fuel pump, stop, and remove their seatbelt in less time than that.
I shut my engine off.
Nearly every fueling station along I-10 in every state from Florida to California is accessible in under a minute. It's very easy to pull off, shut off, and begin coking the oil in the turbo's bushings.
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Old 02-02-2015, 04:38 PM   #56
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You don't let up on the loud pedal and let it drop speed as you approach an exit ramp? You keep full on the pedal then slam to a stop at the end of the ramp? Ray is being realistic. It often takes a light or two, a turn, etc. to get from the freeway to a fuel pump. Letting it sit and idle is a waste of fuel and time, but if it gives feelings of 'drivin' a big rig,' go right ahead.
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