IN TANK MODS
#1
03-06-2010, 11:08 PM
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Location: Russellville, Arkansas
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IN TANK MODS
Did the in tank mods a couple of days ago.While doing them I must of had a senior moment
. I only cut the fill tube vent tube and didn't do the tank vent tube. Will this cause me any fuel tank problems. If so looks like I will be dropping the tank again.
Thanks in advance. Yea I know. Still need to post my signature.
Grady
. I only cut the fill tube vent tube and didn't do the tank vent tube. Will this cause me any fuel tank problems. If so looks like I will be dropping the tank again.Thanks in advance. Yea I know. Still need to post my signature.
Grady
#2
03-07-2010, 12:19 AM
#3
03-07-2010, 07:35 AM
Congrats on doing the tank mod. The Plastic tube cutting is personal preference.
In my opinion by cutting the fill tube nothing will really change from what you had prior. It will bubble splash at yea because the vent tube will plug with fuel before the fill tube. Not allowing it to Breath. I think the only real tube you need to cut is the vent tube. so you can get more fuel in your tank and the tank can breath while doing so.
I did the tank mods. I didn't cut any tube and left them as they were. Was not a problem for me.. I am just careful when filling and don't really care that i get a exact full tank of fuel..
This will not cause you any problem that you didn't already have. Personal preference if you want to drop the tank again. I wouldn't.
In my opinion by cutting the fill tube nothing will really change from what you had prior. It will bubble splash at yea because the vent tube will plug with fuel before the fill tube. Not allowing it to Breath. I think the only real tube you need to cut is the vent tube. so you can get more fuel in your tank and the tank can breath while doing so.
I did the tank mods. I didn't cut any tube and left them as they were. Was not a problem for me.. I am just careful when filling and don't really care that i get a exact full tank of fuel..
This will not cause you any problem that you didn't already have. Personal preference if you want to drop the tank again. I wouldn't.
#6
03-07-2010, 01:45 PM
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#7
03-07-2010, 04:18 PM
I've put over 31 gallons of fuel in one of those "29 gallon tanks", and that was without running empty. Lots of us have gotten 30-31 gallons in the tank, and one guy even carefully measured his when he did the in-tank mods and I think he came up with an actual capacity of something like 32-32.5 gallons.
Cutting the vent tube is what will let your fuel level rise higher before the foam shoots up into the filler neck, that's where you'll gain the most from this mod. Refer to the pic below. Anyone who has watched someone pouring beer into a glass can easily visualize this process. Since diesel foams so much more than gasoline, it is generally the foam coming up the vent tube which contacts the pump nozzle and shuts off the pump (unless you're using one of those ultra-high-flow pumps at a truck stop). That's why shortening the vent tube's extension into the tank will allow the tank level to rise much higher before the foam can even begin to enter the vent tube.
The value of cutting the fill tube is arguable, but most cut both while they're in there. Some have said that if you do NOT cut the tube, the falling fuel will cause less foaming (falls a shorter distance) and help the fill process by generating less foam. However, if you've ever watched the diesel coming from a pump nozzle, there is already tons of entrained air bubles in the fuel, and this is really where most of the foam is coming from to begin with. Therefore, I am personally convinced that cutting the fill tube alone will not gain you nearly as much ground as cutting the vent tube, even though it may help some.
Again, your biggest bang is from cutting the vent tube.
Cutting the vent tube is what will let your fuel level rise higher before the foam shoots up into the filler neck, that's where you'll gain the most from this mod. Refer to the pic below. Anyone who has watched someone pouring beer into a glass can easily visualize this process. Since diesel foams so much more than gasoline, it is generally the foam coming up the vent tube which contacts the pump nozzle and shuts off the pump (unless you're using one of those ultra-high-flow pumps at a truck stop). That's why shortening the vent tube's extension into the tank will allow the tank level to rise much higher before the foam can even begin to enter the vent tube.
The value of cutting the fill tube is arguable, but most cut both while they're in there. Some have said that if you do NOT cut the tube, the falling fuel will cause less foaming (falls a shorter distance) and help the fill process by generating less foam. However, if you've ever watched the diesel coming from a pump nozzle, there is already tons of entrained air bubles in the fuel, and this is really where most of the foam is coming from to begin with. Therefore, I am personally convinced that cutting the fill tube alone will not gain you nearly as much ground as cutting the vent tube, even though it may help some.
Again, your biggest bang is from cutting the vent tube.
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#9
03-08-2010, 08:05 AM
Hotshot
I've put over 31 gallons of fuel in one of those "29 gallon tanks", and that was without running empty. Lots of us have gotten 30-31 gallons in the tank, and one guy even carefully measured his when he did the in-tank mods and I think he came up with an actual capacity of something like 32-32.5 gallons.
Cutting the vent tube is what will let your fuel level rise higher before the foam shoots up into the filler neck, that's where you'll gain the most from this mod. Refer to the pic below. Anyone who has watched someone pouring beer into a glass can easily visualize this process. Since diesel foams so much more than gasoline, it is generally the foam coming up the vent tube which contacts the pump nozzle and shuts off the pump (unless you're using one of those ultra-high-flow pumps at a truck stop). That's why shortening the vent tube's extension into the tank will allow the tank level to rise much higher before the foam can even begin to enter the vent tube.
The value of cutting the fill tube is arguable, but most cut both while they're in there. Some have said that if you do NOT cut the tube, the falling fuel will cause less foaming (falls a shorter distance) and help the fill process by generating less foam. However, if you've ever watched the diesel coming from a pump nozzle, there is already tons of entrained air bubles in the fuel, and this is really where most of the foam is coming from to begin with. Therefore, I am personally convinced that cutting the fill tube alone will not gain you nearly as much ground as cutting the vent tube, even though it may help some.
Again, your biggest bang is from cutting the vent tube.
Cutting the vent tube is what will let your fuel level rise higher before the foam shoots up into the filler neck, that's where you'll gain the most from this mod. Refer to the pic below. Anyone who has watched someone pouring beer into a glass can easily visualize this process. Since diesel foams so much more than gasoline, it is generally the foam coming up the vent tube which contacts the pump nozzle and shuts off the pump (unless you're using one of those ultra-high-flow pumps at a truck stop). That's why shortening the vent tube's extension into the tank will allow the tank level to rise much higher before the foam can even begin to enter the vent tube.
The value of cutting the fill tube is arguable, but most cut both while they're in there. Some have said that if you do NOT cut the tube, the falling fuel will cause less foaming (falls a shorter distance) and help the fill process by generating less foam. However, if you've ever watched the diesel coming from a pump nozzle, there is already tons of entrained air bubles in the fuel, and this is really where most of the foam is coming from to begin with. Therefore, I am personally convinced that cutting the fill tube alone will not gain you nearly as much ground as cutting the vent tube, even though it may help some.
Again, your biggest bang is from cutting the vent tube.
#11
03-08-2010, 09:39 AM
You're probably right, bama29fan, because you have a long wheel base which comes with a larger tank. The short wheel base trucks came with tanks in front of the rear axle which were classified as either 28 or 29 gallons. My Excursion has a Ford-tagged 44 gallon tank, but I've put a tad over 44 gallons in it on a couple of occasions where I had not run out of fuel before filling up.
The whole point is that you can put more in than the OEM-rated capacity, and just how much depends on whether or not you fill it up completely to the top with no foam or if you stop somewhere short of that position. I, like many other, have chosen to keep filling until I see the clear fuel in the fill tube so I can know that I am filling up to the same point from tank-to-tank for the most accurate fuel mileage calculations.
The on-board mileage computers are notoriously inaccurate and tend to over-estimate your fuel mileage, partially due to the fact that OEM-recommended tire sizes are slightly smaller than the odometer is calibrated for. All this means is that you really haven't quite crossed your mileage warranty point quite as fast as you thought because you haven't gone as many actual miles, and that also means that your computer-calculated miles per gallon are probably falsely high.
All this is why a lot of us insist on complete fillups and hand-calculated mileage numbers.
Please forgive my explanation if you already know all this... just making sure that all the rationale is available for anyone who is interested.
The whole point is that you can put more in than the OEM-rated capacity, and just how much depends on whether or not you fill it up completely to the top with no foam or if you stop somewhere short of that position. I, like many other, have chosen to keep filling until I see the clear fuel in the fill tube so I can know that I am filling up to the same point from tank-to-tank for the most accurate fuel mileage calculations.
The on-board mileage computers are notoriously inaccurate and tend to over-estimate your fuel mileage, partially due to the fact that OEM-recommended tire sizes are slightly smaller than the odometer is calibrated for. All this means is that you really haven't quite crossed your mileage warranty point quite as fast as you thought because you haven't gone as many actual miles, and that also means that your computer-calculated miles per gallon are probably falsely high.
All this is why a lot of us insist on complete fillups and hand-calculated mileage numbers.
Please forgive my explanation if you already know all this... just making sure that all the rationale is available for anyone who is interested.
#12
03-09-2010, 09:27 PM
Join Date: Mar 2007
Location: Russellville, Arkansas
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I've put over 31 gallons of fuel in one of those "29 gallon tanks", and that was without running empty. Lots of us have gotten 30-31 gallons in the tank, and one guy even carefully measured his when he did the in-tank mods and I think he came up with an actual capacity of something like 32-32.5 gallons.
Cutting the vent tube is what will let your fuel level rise higher before the foam shoots up into the filler neck, that's where you'll gain the most from this mod. Refer to the pic below. Anyone who has watched someone pouring beer into a glass can easily visualize this process. Since diesel foams so much more than gasoline, it is generally the foam coming up the vent tube which contacts the pump nozzle and shuts off the pump (unless you're using one of those ultra-high-flow pumps at a truck stop). That's why shortening the vent tube's extension into the tank will allow the tank level to rise much higher before the foam can even begin to enter the vent tube.
The value of cutting the fill tube is arguable, but most cut both while they're in there. Some have said that if you do NOT cut the tube, the falling fuel will cause less foaming (falls a shorter distance) and help the fill process by generating less foam. However, if you've ever watched the diesel coming from a pump nozzle, there is already tons of entrained air bubles in the fuel, and this is really where most of the foam is coming from to begin with. Therefore, I am personally convinced that cutting the fill tube alone will not gain you nearly as much ground as cutting the vent tube, even though it may help some.
Again, your biggest bang is from cutting the vent tube.
Cutting the vent tube is what will let your fuel level rise higher before the foam shoots up into the filler neck, that's where you'll gain the most from this mod. Refer to the pic below. Anyone who has watched someone pouring beer into a glass can easily visualize this process. Since diesel foams so much more than gasoline, it is generally the foam coming up the vent tube which contacts the pump nozzle and shuts off the pump (unless you're using one of those ultra-high-flow pumps at a truck stop). That's why shortening the vent tube's extension into the tank will allow the tank level to rise much higher before the foam can even begin to enter the vent tube.
The value of cutting the fill tube is arguable, but most cut both while they're in there. Some have said that if you do NOT cut the tube, the falling fuel will cause less foaming (falls a shorter distance) and help the fill process by generating less foam. However, if you've ever watched the diesel coming from a pump nozzle, there is already tons of entrained air bubles in the fuel, and this is really where most of the foam is coming from to begin with. Therefore, I am personally convinced that cutting the fill tube alone will not gain you nearly as much ground as cutting the vent tube, even though it may help some.
Again, your biggest bang is from cutting the vent tube.
Grady
#13
03-10-2010, 07:20 AM
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You're probably right, bama29fan, because you have a long wheel base which comes with a larger tank. The short wheel base trucks came with tanks in front of the rear axle which were classified as either 28 or 29 gallons. My Excursion has a Ford-tagged 44 gallon tank, but I've put a tad over 44 gallons in it on a couple of occasions where I had not run out of fuel before filling up.
The whole point is that you can put more in than the OEM-rated capacity, and just how much depends on whether or not you fill it up completely to the top with no foam or if you stop somewhere short of that position. I, like many other, have chosen to keep filling until I see the clear fuel in the fill tube so I can know that I am filling up to the same point from tank-to-tank for the most accurate fuel mileage calculations.
The on-board mileage computers are notoriously inaccurate and tend to over-estimate your fuel mileage, partially due to the fact that OEM-recommended tire sizes are slightly smaller than the odometer is calibrated for. All this means is that you really haven't quite crossed your mileage warranty point quite as fast as you thought because you haven't gone as many actual miles, and that also means that your computer-calculated miles per gallon are probably falsely high.
All this is why a lot of us insist on complete fillups and hand-calculated mileage numbers.
Please forgive my explanation if you already know all this... just making sure that all the rationale is available for anyone who is interested.
The whole point is that you can put more in than the OEM-rated capacity, and just how much depends on whether or not you fill it up completely to the top with no foam or if you stop somewhere short of that position. I, like many other, have chosen to keep filling until I see the clear fuel in the fill tube so I can know that I am filling up to the same point from tank-to-tank for the most accurate fuel mileage calculations.
The on-board mileage computers are notoriously inaccurate and tend to over-estimate your fuel mileage, partially due to the fact that OEM-recommended tire sizes are slightly smaller than the odometer is calibrated for. All this means is that you really haven't quite crossed your mileage warranty point quite as fast as you thought because you haven't gone as many actual miles, and that also means that your computer-calculated miles per gallon are probably falsely high.
All this is why a lot of us insist on complete fillups and hand-calculated mileage numbers.
Please forgive my explanation if you already know all this... just making sure that all the rationale is available for anyone who is interested.
