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Old 02-12-2007, 02:36 PM
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Gas at the pump question?

Hello all, I was wondering how much, say 87 octane gas I get when I pull up to these new all three octane level pumps I'm getting when the last person bought 87 and I'm buying 93 octane? I don't know if I worded that right, but I hope You get the picture. It seems to Me there must be gas left in the hose and pump. It's just a thought.

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Old 02-12-2007, 02:54 PM
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It is simple math...

[(Gal @ 87 * 87) + (Gal in hose * 93)] / total pumped = Obtain of your gas

Example 1: [(87 * 4) + (1 * 93)] / 5 = 88.20

Example 2: [(87 * 9) + (1 * 93)] / 10 = 87.60

Example 3: [(87 * 14) + (1 * 93)] / 15 = 87.40

I guess simple is in the mind of the beholder. I knew that Mathematical Analysis class would pay off.
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Old 02-12-2007, 03:47 PM
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Not enough to make much difference on a normal fill up.
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Old 02-12-2007, 07:25 PM
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The simple math answer makes sense, but how much gas is in the hose?(unknown variable?). On a normal fill up it probably doesn't make a difference I agree, but My car only has a ten gallon fuel cell and My dirt bike has a two gallon tank. They're both 11.5/1 C.R. I was just kind of wondering how much gas is left between what ever switches between the tanks and the filler nozzle,(i.e. is it a pint, a quart, or a gallon?).
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Old 02-12-2007, 07:52 PM
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Have you been having any problems that you think might be related to this?
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Old 02-12-2007, 08:02 PM
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Quote:
Originally Posted by Henry Highrise
Have you been having any problems that you think might be related to this?
No just curious, My bike has never been filled from an all in one pump. Where I always bought My gas had separate pumps, but they recently changed them.
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Old 02-12-2007, 08:17 PM
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Well those hoses are probably at least a inch ID and you know how long they are they will hold a good bit of fuel , especially if the previous customer did not drain the hose. The pump cavity itself will probably hold a pint.....so yeah its could be a quart of gas all together........but I have never had any problem with it that why I asked you that question. It is something to think about.
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Old 02-13-2007, 07:07 AM
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how much gas in the hose?

I'd take a clear container to the station, remove the hose and put the nozzle into the container and open the nozzle without starting the pump and let the gas in the hose run into the container, making sure the hose is on a down hill slop without any low Lupe's and see how much gas run into my container. There's still going to be some gas between the selector shut off, but it'd give you an Idea without a calculator.
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Old 02-13-2007, 07:09 AM
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I'm the one who always drains the hose. Brian
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Old 02-13-2007, 09:25 AM
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just squirt a half gallon or so on the ground before you put any in your tank.
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Old 02-13-2007, 10:04 AM
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I heard that it makes no difference what octane gas you pay for ,, you are still getting a very low octane fuel, usually diluted with methanol,, I wasbuying 93 Octane for my 10.5 / 1 comp Pontiac,, and it didn't burn any better than the 87 Octane , still pinged like crazy,, so I found some of the CD-2 lead substitute additive and add a big dose of that,, which seems to really help,, trouble is I found the stuff in Calif,, and havn't been able to find any in Oregon,, down to my last bottle, feeling like a alcoholic,on withdrawal
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Old 02-13-2007, 10:13 AM
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Quote:
Originally Posted by kristkustoms
just squirt a half gallon or so on the ground before you put any in your tank.
Haha, yeah great.
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Old 02-13-2007, 11:23 AM
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It drains back for safety reasons. That is why when you start pumping it will click off a few cents before it starts to come out the hose.
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Old 02-14-2007, 11:46 PM
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Quote:
Originally Posted by kristkustoms
just squirt a half gallon or so on the ground before you put any in your tank.

no, no....

stick it in the fuel tank of my Jeep, Javelin, or cb550. Well, the bike gets hybrid-smoking mpg anyway so yea add it to someone else's musclecar or modded-in-a-good way DD.
-Matt
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Old 02-15-2007, 09:31 AM
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I checked this the other day,but with the style pumps and nozzles I have at the station I use ,they won't let any fuel out unless there is line pressure against the nozzle. I do know that we had a report here in Mississippi that some of our gas station suppliers would run out of 87 octane and would ship the 91 out to take it's place, so you would be getting the mid grade for reg price. Just goes to show that they're ripping us off. The big boys I mean (chevron,Exxon,shell). Cause you know as well as I do that these guys aren't gonna loose any money.(easy easy)Had to calm my self down I was feeling a soapbox episode coming on. I know that most people have a real misconception and understanding of octane.It has do with the marketing. People see premium and think that the gas is better. It is the same exact quality. It has a different chemical content. (I know most every one here knows this but there are new guys that read these post and this is for there benefit). I say on newer vehicles READ YOUR OWNERS MANUAL It will tell you what you need to know as far as octane rating. As a general rule I like to move up one grade of gas for every 100,000 miles on the engine. If you are running a basically stock engine in you hot rod you really don't need the more expensive gas till you start moving above 9.0-1 comp ratio. If you are experiencing clatter check the timing. The engine should under normal operating conditions clatter for about a 1/2 second when you are at cruise spd and fog down on it. But if it continues to clatter you need to check timing IE(weights,vacuum,initial timing) I'm sure there are several post on this web site that deal with this very subject. There are a lot of variables that can have a dramatic effect on timing in newer computer controlled cars and only a few in older carbed non ECM cars. Brian
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