[nighttowl]

http://abcnews.go.com/WNT/video/man-...ation-39911497



I could go on...

[JBARRON]

the reason it's doing this is because the purge valve is stuck open and allowing fuel to flow through the emmission system into the intake. this should set an Evap fault.

.

[Artos]

Originally Posted by JBARRON

the reason it's doing this is because the purge valve is stuck open and allowing fuel to flow through the emmission system into the intake. this should set an Evap fault.

.

I never got any fault but only did it the first couple of fill ups...I just knew the car wasn't happy & didn't like the hiccups.

I actually wanted to ask back in March when I got it simply out of curiosity, but figured the internet safety police would beat me up too bad.

I have 296,000 miles on the 6.0 3/4 Ton company with no fires.

[JBARRON]

Originally Posted by Artos

I never got any fault but only did it the first couple of fill ups...I just knew the car wasn't happy & didn't like the hiccups.

I actually wanted to ask back in March when I got it simply out of curiosity, but figured the internet safety police would beat me up too bad.

I have 296,000 miles on the 6.0 3/4 Ton company with no fires.

The purge valve can be tested by disconnecting the line from tank to valve and capping off.

[STUNNAH]

My AC cools the car quickly, so when refueling in hot weather I just let my windows down...Hell you're getting hot outside the car anyway...Just turn it off...

How much does gas cost in Dubai???

[MrChrisLS3]

Originally Posted by Ajmalian

I'm sorry but could you elaborate? What do you mean by breaking of a vacuum?



I think the answer to your question is in my little writeup all the way below.



I'm guessing you and VABarn are more or less on the same track about seals and breakage of vacuums I'm assuming. You reckon you could elaborate?





No no, gassing up meant filling gas.





You too...please read my write up below.





Never happened before. Just started and idles rough throughout until you stop filling and drive off. That's when it smoothens out.






Ok, so I appreciate everyone's opinion on my writing skills...ha ha very funny!!


However, what I did mean was that the rough idling happens ONLY while filling up gas and for those of you who suggested to switch the car off while filling gas....just because you look away doesn't mean a problem doesn't exist. I mean none of my cars have ever done this and neither does my current ZL1, then why should this 1LT? I mean it just doesn't sound normal. And it's something that was never there. It just recently started.

And finally, in Dubai, yes it is recommended to switch your engine off at the gas station while filling gas, however no it is NOT a law. In our defense, during summer we often have to deal with temperatures well north of a 130 degrees...so nobody switches their car off, especially during summer because even 3 minutes of 'engine off' time is enough to make your car a mobile oven. We behave ourselves more during better weather though.

Now, any suggestions on what the issue could be?

vacuum does play a role in operation of the vehicles, particularly in direct injection vehicles. So, yes it makes perfect sense that the car may idle rough if it's running while system is not sealed. I understand that you said this just started recently, but there could also be other factors involved as well. Outside temps being higher than previous times, fuel level in car at the time of fill up.

I understand the heat issue. I live in southeast Texas, while we don't get to 130 typically, we see temps to 110 and combined with very high humidity, it's probably pretty close to what you see. Fill up early in the morning or late at night when it's only 100 or so, lol.

[DWillys]

[Ajmalian]

Originally Posted by Dustya

All Comments aside about shutting the car off. Because obviously this is not what the OP wants to do. And he clearly stated his other cars do not do this including the ZL1..

My thoughts would be your other cars are higher performance engines with much greater fuel flow and pressure.. Where as creating a "Vacuum Break" does not effect it the same way the 1LT does..

Have him try "gassing up" when the tank is at 3/4 full and see if the results are the same.. If you are filling up at near empty or even 2 or 3 gallons in the tank you could simply be creating some sort of air in the lines by interrupting the fuel flow.

Also these in tank fuel pumps are all in one design the sending unit fuel pump etc.. is all in one... You could possible be dumping gas right onto the sending unit while its trying to operate normally and its getting confused. /shrug..

These are just ideas.. I would have him try to fill up when there is more gas in the tank and see if the problem is the same... or simply just have him open the fuel door while the car is on and see if it happens if it does that pretty much shows you its a vacuum issues.


Now back to the explosion option... These in tank pumps are sealed well however adding air oxygen into the tank while its running especially if the tank is low on gas is always a risk with submerged style pumps.. The chance is low as you would need spark and extra oxygen to ignite the fuel but your still taking a risk as low as it might be its a risk.

hope this information helps you in some way.

FYI- If turning the car off is a issue while refueling once the car is off press and hold the start/stop button for 8 seconds this will give you full access to all your controls put the air on recirculate and let the cool air just recirculate in the cabin while you fill up.

Originally Posted by JBARRON

the reason it's doing this is because the purge valve is stuck open and allowing fuel to flow through the emmission system into the intake. this should set an Evap fault.

.

Originally Posted by MrChrisLS3

vacuum does play a role in operation of the vehicles, particularly in direct injection vehicles. So, yes it makes perfect sense that the car may idle rough if it's running while system is not sealed. I understand that you said this just started recently, but there could also be other factors involved as well. Outside temps being higher than previous times, fuel level in car at the time of fill up.

I understand the heat issue. I live in southeast Texas, while we don't get to 130 typically, we see temps to 110 and combined with very high humidity, it's probably pretty close to what you see. Fill up early in the morning or late at night when it's only 100 or so, lol.

Originally Posted by STUNNAH

My AC cools the car quickly, so when refueling in hot weather I just let my windows down...Hell you're getting hot outside the car anyway...Just turn it off...

How much does gas cost in Dubai???

Cost of fuel in Dubai is $ 2.40 for 98 Octane


And thank you all for the feedback and suggestions and opinions.

[fastball]

People are free to do whatever they want with their cars. I've learned long ago arguing on the internet is just stupid.

If you want to leave your engine on while refusing, go ahead. Just be prepared for problems with your fuel/evap system and I'm glad you don't go to the gas station I go to.

I WILL and HAVE called the attendant when I see someone fueling up with their engine running. Who will kindly advise them to shut off the engine or they'll cut the pump.

[JBARRON]

Fueling the car with engine running will not cause fuel or evap system problems unless a problem already exists.

[F_Two]

Originally Posted by dennis@hixsonnet.com

...if the car's a 'rocken I hope it's not a 'knocken

Fixed it for you.