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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Jul-31-2017, 03:33:18 AM   #1
TheDoogan
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Default Getting Gas with the Engine Running

Hey guys, quick dumb question.

Assume that I will need every second of car warm-up time in the morning to get that oil temp up, and that I have a gas station less than a mile away (oil temp still buried when I pull in).

Is it really a problem to leave the car running while popping the fuel cap off? And if the CEL does come on as a result, am I going to see decreased performance?

I never bother shutting my Rover LR4 down (always have family if I'm driving that, and it's either needing heat in the winter and A/C in the summer, or I don't want to change ambient noise and wake up my wolf pack). Sometimes there's a great deal of suction when I pop that cap off, but that feckin auld betch has never catched er arse, no she ain't.

What do you guys think?
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Old Mon, Jul-31-2017, 04:05:19 AM   #2
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Default Re: Getting Gas with the Engine Running

I wouldn't.
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Old Mon, Jul-31-2017, 04:12:20 AM   #3
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Default Re: Getting Gas with the Engine Running

Probably okay. However, reason I hesitate to do it is usually you fill up with an empty tank. You then expose the tank to oxygen when you open the filler cap and combine that with a running electronic fuel pump and well. Chances are probably as likely as a 747 crashing into your home but still. The stoichiometry will probably never be right for an explosion inside the tank but I'm sure if you tried, you could make it happen.
As far the cel. No issue there. Light will go out. Car just sensed a leak but it won't effect anything and will go off after a few cycles.
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Old Mon, Jul-31-2017, 04:13:17 AM   #4
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Default Re: Getting Gas with the Engine Running

lots of places wont let you fill up while engine is running. Some places it is illegal.
Would be embarrassing if you were in the "big house" and fellow inmates were asking what you in for and all you had was filling up while engine running!

Anyway, make it a habit to fill up on way home. That way if you have to make a quick getaway you do not have to stop for gas on the way!
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Old Mon, Jul-31-2017, 04:18:54 AM   #5
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Default Re: Getting Gas with the Engine Running

Words of the wise.

Thanks guys,

TD
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Old Mon, Jul-31-2017, 07:08:14 AM   #6
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Default Re: Getting Gas with the Engine Running

when it's 100 outside I make exceptions
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Old Mon, Jul-31-2017, 01:31:21 PM   #7
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Default Re: Getting Gas with the Engine Running

Well, as an aside, IMHO, it's bad to get out of the vehicle with it running anyway--just not good practice unless an emergency or something.
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Old Mon, Jul-31-2017, 02:13:48 PM   #8
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Default Re: Getting Gas with the Engine Running

Moreover, you shouldn't warm the car up at idle, anyway-- it's worse for the engine.
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Old Mon, Jul-31-2017, 02:33:50 PM   #9
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Default Re: Getting Gas with the Engine Running

Quote:
Originally Posted by Obioban View Post
Moreover, you shouldn't warm the car up at idle, anyway-- it's worse for the engine.
agree!

I read somewhere that BMW recommended to drive the car for warm up and not let it idle.
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Old Mon, Jul-31-2017, 03:08:33 PM   #10
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Default Re: Getting Gas with the Engine Running

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Originally Posted by OneFastSicilian View Post
agree!

I read somewhere that BMW recommended to drive the car for warm up and not let it idle.
That would be all cars. Start and pull away, do not idle it at all.
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Discussing Getting Gas with the Engine Running in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)