Fuel pumps
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Laughing Gas
Joined: Mar 2008
Posts: 967
Likes: 7
From: coquitlam,BC
Fuel pumps
It seems that 75% of fuel pumps tested were inaccurate up here in the great white north. And you can probably guess which way the inaccurcies went. So much for checking your fuel milage, although offcials did not say how much they were out.
Fleet Mechanic
Joined: Jan 2006
Posts: 1,510
Likes: 7
From: Anchorage, AK
Not quite sure I understand what you are saying.
Duct Tape Tech.
Joined: Jul 2009
Posts: 2,381
Likes: 1
From: San Antonio Tx.
if you think you got screwed at the pump, you can call the states weight and measures dept and file a complaint, they will go check them out.
Edit: At Least in the US.
Edit: At Least in the US.
Last edited by Bob Taulbee; Apr 14, 2010 at 08:42 PM. Reason: add more info
Cargo Master
Joined: Oct 2009
Posts: 2,500
Likes: 14
From: South Carolina
This is not a new issue. I have always found it sad when i am able to pump more fuel in than the tank than it will hold.
Example OEM stated capacity 29gals, fill up with 32gals. Even including the fill tube does not allow extreme overages.
Example OEM stated capacity 29gals, fill up with 32gals. Even including the fill tube does not allow extreme overages.
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Laughing Gas
Joined: Mar 2008
Posts: 967
Likes: 7
From: coquitlam,BC
They are not saying what stations are guilty but at a 7.5 out of 10 fail rate it is not to hard to do the math. I don`t know the laws in the US but up here in Can they are required to check at certain intervals but that is left up to the companies. The goverment is now increasing fines to over 10000$ for repeat offenders. It would be interesting to see the results of a test of pumps in the USA and see if they mirror the results up here.
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Fleet Mechanic
Joined: Feb 2005
Posts: 1,797
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From: Northern Colorado
After many years of installing, rebuilding and repairing liquid measuring meters, I can say with authority that meters wear in the customer's favor --- There is only one way a liquid meter will steal fuel after it is calibrated - tampering.
As far as volume, most petroleum products will expand and contract on temperature changes. Most meters have devices that compensate to 60 deg so when the liquid is below 60 deg, you get less than 1 gallon volume. When it is over 60 deg, you get more than 1 volume gallon. Since most tanks are buried underground the liquid temp is going to be close to 54 deg.
The point is that when you purchase 1 gallon of fuel, you should receive xx btu's no matter what the volume is. Just like if you top your tank off to the top of the filler and then park in the hot sun. The fuel expands and goes all over the ground. You don't have more fuel than you started with, it didn't clone itself in the tank, each molecule is just bigger but holds the same amount of btu's.
Clear as mud huh?
As far as volume, most petroleum products will expand and contract on temperature changes. Most meters have devices that compensate to 60 deg so when the liquid is below 60 deg, you get less than 1 gallon volume. When it is over 60 deg, you get more than 1 volume gallon. Since most tanks are buried underground the liquid temp is going to be close to 54 deg.
The point is that when you purchase 1 gallon of fuel, you should receive xx btu's no matter what the volume is. Just like if you top your tank off to the top of the filler and then park in the hot sun. The fuel expands and goes all over the ground. You don't have more fuel than you started with, it didn't clone itself in the tank, each molecule is just bigger but holds the same amount of btu's.
Clear as mud huh?
Senior User
Joined: Dec 2008
Posts: 470
Likes: 0
From: independence,mo
back when i was racing two stroke mx i had a clear five gallon jug with measurements on the side. very rarely did one gallon on the pump get me to the one gallon mark on the jug. i used a one gallon milk jug and wieghed it to see if my fuel jug was correct and it was.
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