Stupid gas pump question

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Apr 19, 2015 | 05:06 PM

#31

hdbob2006

Stellar HDF Member

Joined: Jan 2013

Posts: 3,466

Likes: 425

From: Illinois

So the gas you pay for,pushes out the free gas in the hose! Octane-schmoctane. Lift hose over head to drain it into your tank.

Apr 19, 2015 | 05:07 PM

#32

FXDXTSport

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Joined: Oct 2006

Posts: 2,565

Likes: 638

From: Washington State

Quote:

Originally Posted by tonydig11

You know how some gas stations have only one nozzle per pump and you select your octane with a button. Well I run a 2.1 gallon tank and when I fuel up it is usually only 1.5 gallons added. I wonder if I select 93 am I getting straight 93 right away or what is left in the hose from the person before me before 93 makes it to my tank. There is a 7/11 by my house that has nozzles for every grade that I try to use but when I don't I just wonder.

What are your thoughts on this.

Personally, I'd be a lot less worried about getting some brand name 87 in with my brand name 93 than I would be about buying gas at 7/11. Up here, 7/11 doesn't even have a name on the gas they pump. I believe it is sediment supreme

Apr 19, 2015 | 05:19 PM

#33

jakenok

Elite HDF Member

Joined: Nov 2011

Posts: 3,513

Likes: 116

From: OKC

Unless you are running a hi comp build, it wouldn't matter if the pump screwed up and pumped 87 into your bike.
Not going to hurt

Apr 19, 2015 | 05:42 PM

#34

Duracell

Stellar HDF Member

Joined: Oct 2007

Posts: 2,806

Likes: 1,754

From: New Bern NC

Quote:

Originally Posted by Stiggy

With the all the plumbing in the pump, and the pick up tube in the tank plus the length of visible hose to the nozzle....I'm not surprised.

It doesn't work that way. Generally there are only two underground tanks at most stations regardless of the number of octanes available. The blend valve that mixes them is in each pump. The hose looks quite thick but the internal diameter of the gas line is maybe 1/2". The amount the testing agency has to purge is overkill, as is the case with most testing.

see the info below from the web site HOW STUFF WORKS

The Blend Valve
One of the first things that a customer will notice at the pump is the variety of choices offered. In most cases, a dispenser will offer several grades of gas -- sometimes as many as five -- each with a different octane rating. The desired octane rating is usually chosen simply by pushing a button. Does this mean that there are five different underground tanks feeding into that dispenser, each offering a different grade of gas? That's not usually the case. In fact, the dispenser can produce as many grades as it wants from as few as two underground tanks, as long as one tank contains the highest grade of octane available at that station and the other contains the lowest. The grades are blended together at the pump -- not unlike the way you'd blend gin and vermouth to make a martini -- producing a kind of octane cocktail. The precise proportion in which the grades are blended determines the octane of the gas that enters the customer's tank.