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Old 03-22-2020, 01:28 PM   #1
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Delete 35 gallon fuel tank and add 100

So I purchased a 100 gallon side mounted fuel tank ... with the safety cage .
I plan on using the safety cage and flanges and also making new flanges . Drilling holes in my chasis and mounting it in the rear center between frame rails .
Thereís a cross member barley in the way and some additional components I need to move .
Iíll take pictures .


The cross member Iím not to worried about since Iíll also be adding in steel so it would act as the same thing I think.

The issues Iím having are the other components that are in the way I think are air suspension electronics which could be moved and that I have no idea of how to go about figuring out what I need to do...
I understand longer fuel lines .. and extended the sensors with longer wire and all that ... then i would also need to make a filler neck or get some fuel rated hose that I can thread to the tank then thread my fuel tank gas cap on too.

Also would 700 pounds that far back an issue .. I think itís kind of countering the weight of the engine up front anyways . Itís a cab over style bus
Would this potentially stress out the fuel pump because itís a longer fuel line?
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Old 03-22-2020, 01:34 PM   #2
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New fuel tank
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Old 03-22-2020, 01:36 PM   #3
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Need to move this cross brace with handicap lift wiring and air brake module
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Old 03-23-2020, 01:59 AM   #4
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As far as the filler tube goes, could you not use the one from the old tank?
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Old 03-23-2020, 06:07 AM   #5
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The tank the bus cam with has a threaded cap on the tank. That’s side mounted . So I just unscrew the cap and put fuel in .
The one that will be rear and between frame rails . I will need to find a way to be able to fill up since it also has just a threaded cap. I will need some kind of hosing that connects to the tank and routes out to the side .
Something like a fuel rated hose that thread on to my tank then with threads that routes to the side of the bus then my cap threads to.
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Old 03-23-2020, 08:18 AM   #6
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I don't think the weight will be a problem at all. What's the GVWR? You're only talking about a 500lb difference between those two tanks, that's like 3 avg teenagers these days

As far as the cross member, it looks like it is bolted into the frame rails? If you can reuse the holes after moving it that would be great, less drilling through frame.?
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Old 03-23-2020, 04:26 PM   #7
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Quote:
Originally Posted by BusT View Post
The tank the bus cam with has a threaded cap on the tank. Thatís side mounted . So I just unscrew the cap and put fuel in .
The one that will be rear and between frame rails . I will need to find a way to be able to fill up since it also has just a threaded cap. I will need some kind of hosing that connects to the tank and routes out to the side .
Something like a fuel rated hose that thread on to my tank then with threads that routes to the side of the bus then my cap threads to.
Ah, you are looking for connecting tubing. I thought the new tank did not have a filler tube.
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Old 03-23-2020, 04:40 PM   #8
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I thought about putting a tank in that spot on my bus but I couldn't figure out a good way to get fuel into it. Long horizontal runs of fuel filler neck seemed like a real pain in the neck for filling large amounts. Where are you putting your filler?
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Old 03-23-2020, 04:45 PM   #9
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If you are mounting the tank between the frame rails near the back, couldn't you route the fill tube out the back as well?
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Old 03-23-2020, 04:49 PM   #10
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another thought from my feeble mind...
leave the original 35 gallon tank in. Mount your new tank as planned, use a electric fuel pump to transfer fuel to the 35 gallon tank as needed with a toggle switch on the dash.
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Old 03-23-2020, 04:49 PM   #11
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My bumper got in the way of a rear-fill location and then I put a back porch on the thing and made it even worse.
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Old 03-23-2020, 04:57 PM   #12
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Weight should be little factor. That's how my bus came oem. My filler door is on the right side 'bout half way between the bumper and the wheelwell.
Makes a very small tunnel on the floor for a few inches.

Don't make your filler neck a rube goldberg -- you'll regret that.

Napa, etc will have filler hose -- it's expensive but you'll only need a few feet.
Or find a junk yard near you with a bus and get the hose and the door w/hinge probably for pennies...
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Old 03-23-2020, 05:10 PM   #13
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Makes a very small tunnel on the floor for a few inches.
Interesting! That never even occurred to me when I was trying to figure out how to do it. Running the filler under the floor was just not acceptable because of the long horizontal run. Learn something new every day.
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Old 03-28-2020, 04:00 PM   #14
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Quote:
Originally Posted by Skoolmee View Post
I don't think the weight will be a problem at all. What's the GVWR? You're only talking about a 500lb difference between those two tanks, that's like 3 avg teenagers these days

As far as the cross member, it looks like it is bolted into the frame rails? If you can reuse the holes after moving it that would be great, less drilling through frame.?
Gvwr is 30,000
Yeah I was concerned about the swooshing and handling when half full and if I would notice handling issues ... Iím starting to think no
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Old 03-28-2020, 04:01 PM   #15
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Quote:
Originally Posted by Native View Post
Ah, you are looking for connecting tubing. I thought the new tank did not have a filler tube.
Yes something like a (filler tube) I think... just so I can reach the tank when pumping from the side of the bus
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Old 03-28-2020, 04:02 PM   #16
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Originally Posted by BarnYardCamp View Post
another thought from my feeble mind...
leave the original 35 gallon tank in. Mount your new tank as planned, use a electric fuel pump to transfer fuel to the 35 gallon tank as needed with a toggle switch on the dash.
Thatís a good idea too but I want to take my oem fuel tank out for an entry door relocation
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Old 03-28-2020, 04:14 PM   #17
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Yes I need access to the back bumper . Possibly have my dirt bike back there and a 3 ft bumper or double hitch cargo carrier rack...
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Old 03-28-2020, 04:20 PM   #18
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Originally Posted by AzironaZack View Post
Interesting! That never even occurred to me when I was trying to figure out how to do it. Running the filler under the floor was just not acceptable because of the long horizontal run. Learn something new every day.
Well isnít the hose like 2in diameter? Iím trying to figure how Iíd be able to slope that into my tank and fill from the side while it runs through the floor
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Old 03-28-2020, 04:21 PM   #19
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What about extending fuel lines and wiring ?
I guess I also need to see if the fuel pump is near the engien or inside the factory tank
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Old 03-29-2020, 09:26 AM   #20
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Quote:
Originally Posted by banman View Post
Weight should be little factor. That's how my bus came oem. My filler door is on the right side 'bout half way between the bumper and the wheelwell.
Makes a very small tunnel on the floor for a few inches.

Don't make your filler neck a rube goldberg -- you'll regret that.

Napa, etc will have filler hose -- it's expensive but you'll only need a few feet.
Or find a junk yard near you with a bus and get the hose and the door w/hinge probably for pennies...

Do you have pictures of the setup?
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