Why must diesel pickup truck owners leave their truck running while getting fuel?

[Triumph]

Saw some lady left her Benz running while pumping gas at Costco, the attendants don't even care even though there's signs posted everywhere to turn off the engine. Might as well smoke at the same time.

Please explain why you think it is dangerous to keep the car running while pumping gas.

 

[midwestfisherman]

My pansy detector is about to explode.

LOL!!

 

[OverVolt]

Please explain why you think it is dangerous to keep the car running while pumping gas.

The signs at the gas station.

Not defending him I don't think it matters for diesel, but just saying where he likely got it from.

 

[smitbret]

Ok, 2 more cents here. Long idling, other than turbo cool-down or cold morning warm up, is a horrible idea on modern diesels because of the emissions equipment. EGR valves get coked up and stuck open/shut, dpf systems regen more often because of the same soot issue, and I'm not sure if urea systems suffer particularly from it. Too bad there wasn't an alternative to EGR, it's the worst idea ever from an engine reliability standpoint.

This is very true, also.

I remember when the new 07 Cummins came out (or 06) with the new requirement for Ultra Low Sulfur Diesel and these guys were plugging their particulate filters from all of the idling. Normally that stuff will burn off when you hit highway speeds but their idle to drive ratio was so bad that it never heated up long enough to do the job.

 

[eldorado99]

The main reason for the idle is to cool the turbocharger. Especially if it has been under load like towing. 5 minutes is usually sufficient. The whole "takes more fuel to start up than idle" pretty much went away with fuel injection and the Duramax engine for Chevy and the 2004 Dodge Cummins engine.

What diesel engine are you talking about that didnt have diesel fuel injection?????

 

[Triumph]

The signs at the gas station.

Not defending him I don't think it matters for diesel, but just saying where he likely got it from.

Ridiculous notion.