Excursion Tank Mod: ideas and physics help needed
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
True, but with the rear tank being alot deeper than the main tank, wouldn't that be pretty much eliminated if I pulled from the rear tank? What about an "external sump" to hold fuel to make up for that? I have an in-line fuel filter that might act something like that... I don't know, I'm just thinking. I still don't know how it could be an issue with the main tank being as long as it is... I would think that if hilly country was a problem, the length of the main tank would be too which it's not. Doesn't the fuel bowl help make up for a bit of that? Just thinking out loud here...
Otherwise you're going to have to have a dual fuel pump system and switch back and forth like the OBS gassers do, or have a transfer pump that draws from the aux tank and fills the main tank.
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Posting Guru
Joined: Dec 2009
Posts: 2,265
Likes: 2
From: Garden City, KS
You talking about the rollover valves? I don't think they have adequite volume to handle venting while filling up.
If I were to do something like you are suggesting, I would run a 1 inch pipe on the bottom and a 1/2 inch pipe along the top with a tee in the middle of both and a vertical pipe between the top and bottom to eliminate any chance of pocketing.
But I still would recommend against doing something like this. Fuel pump draws from the front tank and you are down to less than 1/8 tank and now here is a big hill to climb.
All the fuel will run to the back tank and starve the fuel pump.
Unless you ran the 1 inch pipe from the very front of the tank so that if you had to climb a hill with low fuel, that escape route for the fuel is cut off until you level out again.
If I were to do something like you are suggesting, I would run a 1 inch pipe on the bottom and a 1/2 inch pipe along the top with a tee in the middle of both and a vertical pipe between the top and bottom to eliminate any chance of pocketing.
But I still would recommend against doing something like this. Fuel pump draws from the front tank and you are down to less than 1/8 tank and now here is a big hill to climb.
All the fuel will run to the back tank and starve the fuel pump.
Unless you ran the 1 inch pipe from the very front of the tank so that if you had to climb a hill with low fuel, that escape route for the fuel is cut off until you level out again.
In response to your last post, I can see how that'd be if the tops weren't level, but they would be... only the bottoms wouldn't. Would that still cause problems? I wish I could simulate the whole thing with a small scale model...
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Posting Guru
Joined: Dec 2009
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From: Garden City, KS
Man, I would if I had money to spend right now... I was just trying to plan this thing out and find out if it's even something I'd wanna fool with. Thanks for the offer... I may PM you one of these days and see if you still have it.
Posting Guru
Joined: Feb 2010
Posts: 1,411
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From: Opelika, AL
only way i can picture it working is to have two fill necks....one for each tank and then a check valve in the pipe between the two tanks.
as for small scale...i have seen the two gallon water jugs (from walmart) that you put in you fridge (the have a tap). they are somewhat rectangular (similar shape as fuel tank) and cheap. you could then pipe them together somehow to test the system. im sure theres other ways but thats what first popped in my head.
as for small scale...i have seen the two gallon water jugs (from walmart) that you put in you fridge (the have a tap). they are somewhat rectangular (similar shape as fuel tank) and cheap. you could then pipe them together somehow to test the system. im sure theres other ways but thats what first popped in my head.
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Posting Guru
Joined: Dec 2009
Posts: 2,265
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From: Garden City, KS
only way i can picture it working is to have two fill necks....one for each tank and then a check valve in the pipe between the two tanks.
as for small scale...i have seen the two gallon water jugs (from walmart) that you put in you fridge (the have a tap). they are somewhat rectangular (similar shape as fuel tank) and cheap. you could then pipe them together somehow to test the system. im sure theres other ways but thats what first popped in my head.
as for small scale...i have seen the two gallon water jugs (from walmart) that you put in you fridge (the have a tap). they are somewhat rectangular (similar shape as fuel tank) and cheap. you could then pipe them together somehow to test the system. im sure theres other ways but thats what first popped in my head.
Have a nice Beer!!!
Joined: Nov 2006
Posts: 5,024
Likes: 1
From: WA Resident
My thoughts exactly. Two filler necks, and check valve between the tanks. Could add a second pump to pump fuel between the tanks with switch in cab to turn on and off pump. Plus a fuel guage to see the tank level. K. I. S. S......Keep it simple.....
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