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Old 04-24-2014, 09:50 AM   #1
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Diesel Engine Off While Refueling???


In researching the above topic I see no history as to this quesiton being previously discussed. If such a topic does exist I would appreciate a link to that thread.

BACKGROUND: Being new to diesel side of TVs I have been doing a bit of research of how to do things... One of the things that I have come across is that Diesels should be run a bit after coming off the road before being shutdown (especially while working hard). My question revolves around those times when I would be towing and on the road and am fortunate enough to pull directly into a diesel pump. I don't want to damage the turbo due to high EGT and want to do the right thing to not damage turbo bearing and other such parts/systems...

Again, my question is, "Is it an accepted practice to refuel with engine running?" If it is not ok, then what do you do? Do you pull into a truck slot in the rear and let it idle for minutes to allow it to cool down and then get fuel???

As always, thanks for sharing your great well of knowledge and experience.

Happy Travels,

B n D

His TV: 2014 RAM 3500 MC DRW 6.7 CTD AISIN
His RV: 2014 REDWOOD 38FL (House)
Her TV: 2013 RAM 1500 CC 5.7 Hemi
Her RV: 2010 VCross 20VFB (Camper)
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Old 04-24-2014, 09:54 AM   #2
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I don't shut down my truck until my truck's EGT (Pre-Turbo) is at or below 350 def F.
Now, unless it's really hot and I'm really working it, it's not much more than a minute of idling to cool it off (if that long, depending on how cold it is outside).

I always shut off before fueling.

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Old 04-24-2014, 10:46 AM   #3
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Shouldnt take more then the time you slow roll through the station to the pumps that EGTs and temps are at acceptable levels. That being said, legally you are supposed to shut down when refueling. Does everyone do it? No. I know I am just as guilty for not shutting down at a diesel only pump, but usually that is when filling the aux tank (which also has a transfer pump for filling other equipment.)
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Old 04-24-2014, 11:12 AM   #4
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Diesel does not have explosive vapors, but the nearby gas pumps do. I usually shut down.
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Old 04-24-2014, 11:53 AM   #5
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I shut down to fuel because of the gas pumps nearby. My EGT temps drop fast enough that by the time I am at the pump everything is cool.
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Old 04-24-2014, 12:57 PM   #6
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As stated, by the time you coast down the off ramp, light load up the road the distance to the station, then crawl into the pump area, your EGT should be fine.

That said, depends. I have gone both ways, if I'm at a diesel only area with someone else in the truck, I'll leave it running. Gas area or alone, I'll shut it down.
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Old 04-24-2014, 01:30 PM   #7
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Never shut ours down to refuel.
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Old 04-24-2014, 02:45 PM   #8
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Your newer diesel you are better off not letting it idle too long. Typically if I plan to let mine sit for more than a couple of minutes I will shut it off. Any less and I will let it keep running.
The reason the newer diesels shouldn't idle is due to the new emissions they are installing. Idling is a rather inefficient process with diesels and creates a fair amount of soot and debris from unburnt fuel. The unburnt fuel will begin to plug your DPF filter and either your truck will go into regeneration to clean this filter or worse yet you may need to replace the filter. These filters do have a service life, a fairly long one, but idle time decreases their life.

Another down fall to idling for longer periods is that at an idle your fuel pressure isn't very high. Since the fuel pressure isn't very high the spray pattern from your injector isn't at its optimum patter and begins to flush the cylinder walls with diesel fuel. This can get fuel between the piston rings and the cylinder walls and can actually get into the oil.

As others said, typically by the time you reach the pump your temps have had enough time to settle themselves to where they need to be.

During the winter time, I will typically let mine idle quite a bit longer than normal to help keep fuel flowing and avoid the harder starting...

Idling typically will not hurt anything when done with in reason. Too much idling can cause harm.

as Narboza said, diesel doesn't emit the volatile vapors that gasoline does. Idling a diesel at a pump is not going to cause any harm, although some may argue this fact.

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Old 04-24-2014, 03:04 PM   #9
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Yep, my truck has an engine idle shutdown after 5 minutes if the truck is in park. If it's in drive it will shutdown after a 15 minute idle.

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Old 04-24-2014, 03:33 PM   #10
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Originally Posted by Oakman View Post
Yep, my truck has an engine idle shutdown after 5 minutes if the truck is in park. If it's in drive it will shutdown after a 15 minute idle.
If you're ever parked next to OC...disable this feature on your truck! LOL

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