| Author | Message | ||
     Slickster |
I use 93 (R+M) octane in my 2003 XB9S and have a question with the stations that have 3 fuel grades (87,91,93) supplied from one hose. Concern is if the person before you selected 87 regular unleaded how much of that grade will be supplied before the 93 premium will be dispensed into my tank. Suspect all three grades are not separately piped to the fuel hand nozzle. Am thinking It would be best to use the pumps that have a separate hose for premium. Any thoughts. Thanks Wayne | ||
| Diablobrian |
there is a manifold inside the pump itself. There is very little fuel left inside the hose itself. Most pumps drain the majority of the fuel back to the tank after the pump turns off. The only fuel left will be what does not siphon back out of the hose. | ||
| Paulson |
I did see a news team report on this issue once in Seattle. They had differing results with sometimes as much as 1 full gallon of the other grade coming through. I personally take my bike to stations with different nozzles per grade when I can. | ||
| Sleez |
i've also seen reports of up to 1 gallon of previous grade, can add up in a 4 gallon refill! | ||
| Bads1 |
Those reports are could be accurate but if they are then the pumps are faulty and EPA will catch that in under a week. Its almost impossible. | ||
| Perry |
How will they catch it so fast? The pumps here in UTah have a sticker for the last inspection/verification date for the weights and measures. Usually, it is some time within the last six months. And, that is just to ensure that you actually get 1 gallon when it reads one gallon. I am quite sure they don't test for octane. I've searched around the net and seen conflicting stories. I'd like to see someone speak to a company that MAKES the pumps and hear what they have to say. | ||
| Bads1 |
By law the pumps cannot hold fuel of that amount. The pumps have to bring it back. There is more then one inspection as well. Like making sure the owner is complying with replacing the three seperate filters for your three grades of gas. If that much gas is in the hoses its a huge hazard. Not to mention if that much gas were left in my brothers pumps at his station the next person to pump gas would be getting a gallon free. | ||
| Mikej |
So, am I paying for only what comes out the nozzle, or am I also paying for what remains in the hose and gets sucked back into the tanks? Used to be you could turn off the pump, then open the nozzle and drain the hose, which wasn't worth much for a car's tank size, but added up for a bike. | ||
| Sleez |
EPO No. 22 Examination Procedure Outline for Retail Motor-Fuel Dispensers Blended Product It is recommended that this outline be followed for blending-type, power-operated retail dispensers--"gasoline pumps," analog or digital, and consoles. Nonretroactive requirements are followed by the applicable date in parentheses. exerpts follow: When taking gasoline samples from blended product dispensers, the samples should be collected after an observed sale of the particular grade or product to be tested, or sufficient product should be purged from the hose to ensure the sample is representative of the grade or product being sampled. The National Conference on Weights and Measures policy on procedures for taking samples for octane verification is as follows: “A minimum of a liter (0.3 gallon) of engine fuel shall be flushed from the dispensers before taking a sample for octane verification. This flush shall be returned to the storage tank containing the lowest octane.” (see NCWM Publication 21, Petroleum Products Sampling Procedures and Safety Manual, August 1997). more info; http://ts.nist.gov/ts/htdocs/230/235/rmfdcourse2003/NIST11aPDF/Appendix%20EPO%20No.%2022-Rev7-03EEI.pdf http://www.guangmingdaily.com.cn/fuel_dispenser_structure_devices.html (Message edited by sleez on April 17, 2006) (Message edited by sleez on April 17, 2006) | ||
| Whodom |
We discussed this at length here some time back. IIRC someone pointed to a standard that said a maximum of 0.5 gallons of fuel could be "mixed" on single hose pumps. One XB'er had the practice of periodically topping off his tank (say 1 gallon or less) which would tend to maximize this problem on single hose pumps. I.E.- theoretically he could get a 50/50 mix of regular and premium if he habitually did fillups of 1 gallon. I occasionally fill up at single hose pumps, but I'll always use a 3 hose pump when I can. | ||
| M1combat |
That was a while ago... BTW Dana... About your statement above about someone getting a free gallon... Not quite, he would get a gallon that the last guy paid for, but the last guy will have gotten the one from before that and so on. | ||
| Bigj |
There are a couple of ways you can use a 1 pumper. Some units will actually indicate which octane the last user pumped. If so, just drive thru and find one. If not, you can divide the price by gallons, and figure which one. If you're close on octane requirements already, a dose of .5 gallon of 87 in a 3 gallon fillup could be an issue. | ||
| Mr_cuell |
Am I really out of it? Does it matter? Unless I am deaf, I have never heard any knocking. I imagine there must be a bajillion threads on octane and knocking. I'm going to look it up, but I think I put 87 in the other day just to snub my nose at the whole thing. Seems like just a way to rip us (the general public with our normal compression vehicles) off. (now I'll probably go RTFM and find out we're at like 11:1 or something. . . . | ||
| Ez_rider |
And if the 0.5 gallons left in the hose concerns you - I have a friend that drives a tanker truck for a large gasoline company here in central CA, and he told me that they occasionally deliver the wrong gas grade to the tanks at the gas station. I guess the tankers have several "holds" and they deliver all three grades of gasoline at one visit. Apparently, it's possible to mis-match the tank on the truck to the proper tank in the ground at the gas station, and end up with the wrong type of gas being pumped into the holding tanks at the gas station (i.e. pump regular gas into the premium holding tank.) I would think they would have different size connectors or something to prevent this, but apparently not. Moral of the story - if your bike suddenly runs like crap with premium gas, maybe it's not as "premium" as you may think! | ||
| Diablobrian |
You also don't want to get gas until an hour or so after the truck fills the the station's tanks. When the tanks fill it can stir up crud and moisture that was on the bottom of the tank. I found out the hard way a few years back... |
