Auxiliary Fuel Transfer

[xcmountain80]

Yes that was a shadow of a thought in my mind. I know that the tank needs to be slightly lower than the fill, so should the tank be angle with washers to no..no.. that wont help the hose stay the same. I guess my figuring will be more accurate when I actually put the tank up to calculate where it will need to sit so that the 90 hits the bottom of the truck. I guess I need to find the angle otherwise rely on gravity to fill it and be patient but man I hat when that pump handle kicks off a million times, so annoying.

Aaron

 

[ntsqd]

I would use the fill neck out of a late model. It will have the much needed fill vent as well. I think the lack of that vent is what plagued the 100 gallon tank.

With an angle finder you can figure out the angle that the fill cap gasket surface needs to be at for the fill nozzles to work properly.

 

[xcmountain80]

Well for it to be flush with the bumper an angle neck wont work so well, unless I can find a interior angled marine filler neck. If you are familiar with the 4Runners bumper, it wont be able to have an angled neck that protrudes out, otherwise it would impede the doors opening and closing. As for the vent the tank will be vented to the stock vent line allowing pressure to escape similar to the stock setup, as for a vent on the fill line, not certain that would be wise for this application for the simple fact you might end up filling the vent line with fuel.

Aaron

 

[ntsqd]

The bracket I mentioned above *might* solve both the angle problem and the clearence problem. There used to be a really good picture of it on the TransferFlow page. Should look familiar as every production work truck flatbed or box van since the 80's has at least one of them.

The fill vent is a larger second hose that taps into the fill tube just below the cap and above the point of the nozzle's entry. This allows the air displaced by the fuel coming in to the tank to be vented into the fill station's system. The normal tank vent can't flow enough volume during filling and if it were the only vent it would soon create a small pressure in the tank which the nozzle's valve can sense. I believe it is this back pressure which shuts off the nozzle.
The fill vent does nothing while the vehicle is in operation.

 

[xcmountain80]

Ok I know what your talking about, though not sure how to go about mounting that horizontally. I will have to try either run a breather from tank to filler neck where on the marine units from my knowledge a breather attach point is not included. In addition to a breather from tank to OE breather. Though given the size of the breather line I agree I might build back pressure given the input size of the fuel line, though the stock system keeps up and doesn't build back pressure. I will have to try and fail or try and succeed, I just want to build it right and not half ass. For the frame I more than likely will use steel L channel and weld a frame for the lower portion of the fuel cell then add legs that run up the sides L channel of course to hug the fuel cell and then fab up a mount bracket a couple inches higher than the filler neck on the fuel cell, and hopefully tie it into either the stock hitch mounting points or make mounting points. I hope to have everything welded other than, the fuel cell being bolted to the lower frame and the built frame being bolted to the Truck frame. I need to pick up from napa a fuel pump, Viton or fuel approved rubber hose 1 3/4" dia. 90 deg. , Viton hose or fuel approved 1 1/2" , 1 3/4" to 1 1/2" reducer metal or approved plastic, various size hose clamp with non perforating coupling mechanism. Either viton or approved rubber hose in a vaccum line size. Some length of L channel, and maybe some flat steel 2" wide.

Aaron