I had a mishap at the gas pump

[Steve #1]

Originally Posted by lennyrebel

Your the kind of guy where the world is all wrong and your always right. Look in the mirror at a stupid as- if you keep it up we won't have to look at you much longer. I serviced those gas nozzles for years. They work on back pressure against small sensor tube. If you got the truck running your actually pulling gas from tank creating a negative pressure at sensor. My POINT-- GROW UP and WAKE UP guys like you are a hazard to civilization. Amen

Now there is a reasonable answer to the question.

Why should you turn the engine off? It prevents the auto shutoff from working properly.

Just thought I'd point that out incase anyone missed it like I almost did because of Lenny's crappy attitude.

Lenny, perhaps YOU should look in the mirror before you tell someone they?re stupid and to grow up. Somebody not knowing the inner working of a gas pump does not make them stupid. My guess would be that over 99% of the population doesn?t know the inner workings of a gas pump. I?d like to think that a larger portion of the population knows how to have an intelligent discussion.

I'm new to this forum, and this is only my third post. I must ask, what's with all the negative attitude here? Is it always like this?

[Steve #1]

Originally Posted by Steve #1

Now there is a reasonable answer to the question.

Why should you turn the engine off? It prevents the auto shutoff from working properly.

After giving it some thought, this explanation doesnt even work for me. In order for the running engine to create negative pressure, the engine would need to be consuming fuel faster then the pump can pump it in. Even the most thirsty engine isn't going to be using a noticeable amount of fuel at idle.

[lamric]

Originally Posted by Steve #1

After giving it some thought, this explanation doesnt even work for me. In order for the running engine to create negative pressure, the engine would need to be consuming fuel faster then the pump can pump it in. Even the most thirsty engine isn't going to be using a noticeable amount of fuel at idle.

...That and the fact that the nozzle is in air and not fluid until the tank is full. There's no way you could pull enough vacuum down the fuel filler to trip the nozzle at engine idle.

http://www.straightdope.com/classics/a1_263.html

[lennyrebel]

Originally Posted by lamric

...That and the fact that the nozzle is in air and not fluid until the tank is full. There's no way you could pull enough vacuum down the fuel filler to trip the nozzle at engine idle.

http://www.straightdope.com/classics/a1_263.html

I guess your failure to understand how the charcoal canister and assorted tubing relates to the filler neck adds to your misunderstanding. Because I don't want to see a massive explosion I guess I'm the fall guy. No understanding some peoples logic.

[lamric]

Originally Posted by lennyrebel

Your the kind of guy where the world is all wrong and your always right. Look in the mirror at a stupid as- if you keep it up we won't have to look at you much longer. I serviced those gas nozzles for years. They work on back pressure against small sensor tube. If you got the truck running your actually pulling gas from tank creating a negative pressure at sensor. My POINT-- GROW UP and WAKE UP guys like you are a hazard to civilization. Amen


I guess your failure to understand how the charcoal canister and assorted tubing relates to the filler neck adds to your misunderstanding. Because I don't want to see a massive explosion I guess I'm the fall guy. No understanding some peoples logic.

Uh....I don't see any mention of the filler neck, tubing and charcoal filter in your post about the workings of the nozzle. We were discussing your post about how the engine running could keep "back pressure" from shutting off the pump. In reality it isn't back pressure that shuts off the pump, it's vacuum.
I never said that filling the tank with the engine running is a good idea. I don't agree with your explaination of why it isn't.

[fourfourto]

Apparently the truck running had nothing to do with it Lenny (where you from... canada )

The danger level is crazy high when the pump sticks.
(Even if I was standing there I would have used the lock,then the gas would have sprayed back on me )

The danger level is rather low pumping with the engine running .(very stupid thing to do anyway )

[SR1355]

I think I left the truck running....