Tips On Pumping Fuel -- Good Info
11-03-2007, 06:30 AM
#31
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I should put in a good word for moving the tank vent.
I have done this mod and highly recommend it to all. Before moving the vent, it was hard to get fuel standing in the fill pipe on my trucks. It would take more than 15 minutes of fighting the foam at the top of the tank. That is a long time to get the last 3 or 4 gallons in. It didn't seem to help much trying to fill the tank as slow as possible either.
Now that I have moved the vent, I can fill it as fast as the pump will pump and it hardly makes any more foam than filling as slow as possible. And now, it only takes a couple of minutes at the end of filling to get fuel standing in the fill pipe!
If you haven't done this mod; you will really enjoy it. It has a 'high bang for the buck' ratio!!
Dan
I have done this mod and highly recommend it to all. Before moving the vent, it was hard to get fuel standing in the fill pipe on my trucks. It would take more than 15 minutes of fighting the foam at the top of the tank. That is a long time to get the last 3 or 4 gallons in. It didn't seem to help much trying to fill the tank as slow as possible either.
Now that I have moved the vent, I can fill it as fast as the pump will pump and it hardly makes any more foam than filling as slow as possible. And now, it only takes a couple of minutes at the end of filling to get fuel standing in the fill pipe!
If you haven't done this mod; you will really enjoy it. It has a 'high bang for the buck' ratio!!
Dan
11-04-2007, 10:45 PM
#33
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But, foaming won't throw the trip computer off. Provided the stations pumps are accurate (And most are very accurate!) you are getting the quantity of fuel you are being charged for. You are paying for liquid, the pump is dispensing liquid and that is that. Now what you do with it as it is delivered or afterwards, it doesn't change the amount dispensed. Besides, the foam is gone for the most part in about 15 minutes.
I would be curious to know how our trip computers calculate mileage. They could have a way of measuring the amount of fuel being consumed by some sort of flow meter. I don't think that is how they work. I theorize that they instead approximate the amount of fuel being used by calculating it off of how long the injectors are open..... Either way, we are dealing with liquid fuel and not foam......
Now, if you can tell me how to get my overhead to be closer, I would really appreciate it. My other Cummins have been alot closer than this one. They were usually with in .5 mile to the gallon. This current lyar is often 2 or 3 miles off per gallon! (I theorize that this is another sign that something is wrong with my injection system, since it reads higher than what I actually get).
Who really knows.........
Dan
I would be curious to know how our trip computers calculate mileage. They could have a way of measuring the amount of fuel being consumed by some sort of flow meter. I don't think that is how they work. I theorize that they instead approximate the amount of fuel being used by calculating it off of how long the injectors are open..... Either way, we are dealing with liquid fuel and not foam......
Now, if you can tell me how to get my overhead to be closer, I would really appreciate it. My other Cummins have been alot closer than this one. They were usually with in .5 mile to the gallon. This current lyar is often 2 or 3 miles off per gallon! (I theorize that this is another sign that something is wrong with my injection system, since it reads higher than what I actually get).
Who really knows.........
Dan
11-23-2007, 08:13 AM
#34
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Foaming will keep you from getting the tank full! Before I moved the vent, I had a hard time getting fuel 'standing' in the fill pipe. Now it is pretty easy to do and I think it is real consistant at it too.
Anyway, I have started asking Costco what their fuel temp is when I fuel up. They have a pretty good system that will show any water, fuel temp and gallons in storage. It also shows how many 'Temperature Compensated' gallons there are. For my last fuel up the air temp was 24F, fuel temp was 54F and they had 9280 gallons down there. The 'T/C' gallons were 9313 or a 33 gallon difference based on a 6F temp drop from the magical 60F.
I am pretty convinced that this whole argument and planned legislation to get temperature compensating fuel pumps installed at all stations is just going to wind up costing us as consumers a ton of money. You can't tell me that spending all those thousands of dollars on the new equipment will really do anything for us except that we will get to pay for it all.
I vote to leave our current system in place and not worry about it. It does make a difference through out the year: In the summer you are loosing a little fuel and in the winter you gain a little. It may well balance out in the long run using our current system. Even if we are getting a little loss of gallons we pay for it should be a whole lot cheaper than paying for a total new system!
Just my 2 cents worth,
Dan
Anyway, I have started asking Costco what their fuel temp is when I fuel up. They have a pretty good system that will show any water, fuel temp and gallons in storage. It also shows how many 'Temperature Compensated' gallons there are. For my last fuel up the air temp was 24F, fuel temp was 54F and they had 9280 gallons down there. The 'T/C' gallons were 9313 or a 33 gallon difference based on a 6F temp drop from the magical 60F.
I am pretty convinced that this whole argument and planned legislation to get temperature compensating fuel pumps installed at all stations is just going to wind up costing us as consumers a ton of money. You can't tell me that spending all those thousands of dollars on the new equipment will really do anything for us except that we will get to pay for it all.
I vote to leave our current system in place and not worry about it. It does make a difference through out the year: In the summer you are loosing a little fuel and in the winter you gain a little. It may well balance out in the long run using our current system. Even if we are getting a little loss of gallons we pay for it should be a whole lot cheaper than paying for a total new system!
Just my 2 cents worth,
Dan
11-23-2007, 11:23 AM
#35
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Don't forget the time involved fueling up at certain times rather than combining fueling with other trips . Do you save more by following these tips than you use making the extra tip ? And how about the long lines if everybody followed these tips and fueled at the same time ?
11-23-2007, 06:43 PM
#36
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This is BS. I haven't done the research, it's just plain old common sense. I'm inclined to say that in most climates the tanks are far enough under ground (all it takes is a few feet) that the outside temp doesn't effect the temp of the fuel very significantly. If you can prove this theory otherwise, I still call BS for the following reason.
Lets picture a large tank of water above ground for a moment. It takes a substantially larger amount of energy to heat liquid (gasoline, diesel, water, etc.) than it takes to heat gas (i.e. air). With the average temperature change throughout a day (according to my local weather report it's an average of 14-18 degrees high vs. low), you would not see a significant change in water temp throughout the tank. If your average high was 50 degrees, and your average low was 35, then you'd see the water remain pretty much consistently somewhere in between those two numbers.
-Luke the myth debunker
Lets picture a large tank of water above ground for a moment. It takes a substantially larger amount of energy to heat liquid (gasoline, diesel, water, etc.) than it takes to heat gas (i.e. air). With the average temperature change throughout a day (according to my local weather report it's an average of 14-18 degrees high vs. low), you would not see a significant change in water temp throughout the tank. If your average high was 50 degrees, and your average low was 35, then you'd see the water remain pretty much consistently somewhere in between those two numbers.
-Luke the myth debunker
11-25-2007, 10:26 PM
#38
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11-27-2007, 06:50 AM
#40
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It doesn't seem to have any effect on my overhead mileage: It was and still is a LIAR!!
I had it in to the dealer so I asked them if they could do anything for it. It is 2 to 3 MPG over reality.... They said they installed a 'CCN flash' to help it's accuracy.
I don't know how it was supposed to work; but, it made my actual mileage go up a fair bit! It didn't help the overhead be any more accurate; but, who is complaining about more mileage out of the truck?
I'm convinced the trip computer calculates mileage from how much fuel the injectors are 'supposed' to be injecting and how many miles have been traveled since the reset was last pushed. I think my injectors are 'squirting' alot more fuel than they are supposed to. Thus the trip computer is always higher than reality........
I'm happy for the sudden increase though. I have always gotten 14 to 15 the whole time with this truck. We just went on a road trip at around 68 mph and got 18.3 mpg! Whoo Hoo!!! If I can get it a little higher I will be estatic!
Dan
I had it in to the dealer so I asked them if they could do anything for it. It is 2 to 3 MPG over reality.... They said they installed a 'CCN flash' to help it's accuracy.
I don't know how it was supposed to work; but, it made my actual mileage go up a fair bit! It didn't help the overhead be any more accurate; but, who is complaining about more mileage out of the truck?
I'm convinced the trip computer calculates mileage from how much fuel the injectors are 'supposed' to be injecting and how many miles have been traveled since the reset was last pushed. I think my injectors are 'squirting' alot more fuel than they are supposed to. Thus the trip computer is always higher than reality........
I'm happy for the sudden increase though. I have always gotten 14 to 15 the whole time with this truck. We just went on a road trip at around 68 mph and got 18.3 mpg! Whoo Hoo!!! If I can get it a little higher I will be estatic!
Dan
11-27-2007, 06:54 AM
#41
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My other CTDs were usually right on between overhead and actual. They also ran at a good 18 to 19 + MPG and 20 + on the highway. That is why I thought something is wrong with this one when it always gets 14 or 15 mpg.... Who knows? I can live with the trip computer being wrong if the truck will get 18 - 19 or more!
Dan
Dan
11-27-2007, 07:13 AM
#42
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Pumping slow allows less air to be "mixed" into the fuel, and allows time for the tiny bubbles to rise to the surface, before they are sucked into your injection pump. Filling up at 1/2 full is a good idea for this reason alone.
11-27-2007, 07:18 AM
#43
DTR's Night Watchman & Poet Laureate
Especially if you use the high pressure or "semi" pumps...they put alot of air into the fuel....
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