Hot Rods Gas tank question

I have a 48 Chevy truck with the stock tank under the bed, the filler tube comes through the box and angles upward. My question is I am thinking of putting a flush mount fuel filler on the boxside and it is non-vented so I will vent the tank and use a roll over vent in the top of the tank. I am not worried about gas sloshing out with a full tank but am concerned about filling and then having it slosh out. The fill tube on the tank doesn't have much of an angle to it. What's your thoughts?

 

If it's a non vented cap and you have a roll over vent how could the gas spill ?

 

In three words IT WILL NOT WORK. It's enough of a pain in the butt to fill it with a stock filler neck with the high pressure pumps let along fuck it up to where you can't fill it at all.
There isn't a pump made that has a nozzle long enough to reach far enough back in that filler neck to get to the bend to run fuel into the tank rather than on the ground. You really don't have any measurable drop from the bedside to the bend where it goes into the tank. This being my old tank that I had sitting out back upside down and a mouse decided that it would make a great home.
You still have about three inches from the end of the filler neck to the bedside.

 

1 Hotrod, your on the right track. If the fill inlet is not raised up you will have gas running out the vented cap. Or worst case you park on a hill with a full tank and someone steals your cap, now you have a dangerous situation.
I went through this on my Studebaker. I used a tank for a 65 Chevy two and installed it backwards so I would have the sump at the rear and the fill neck would be at the right rear. Those tanks are not vented so I drilled four small holes in the cap. If the tank had to much fuel in when you turned a corner the fuel would run out the holes in the cap. To fix the fuel loss and vent the tank I welded a bung in the fill tube and added a rollover valve. I then got another cap with no holes which is non vented and that took care of that. Adding the bung and the valve did make it harder to fill because you have to hold the nozzle just right to keep the nozzle from shutting off. Here are a couple photos, you can see the fill tube is to level, but if you have bed sides that is easy to fix.

 

Just add this fill tube and you would be good to go. And the sending units can be had with a 5/16 or 3/8 outlet. And watch the year, I don't remember the cutoff but they have different ohm sending units also. https://www.tanksinc.com/index.cfm/...UjeeWL-n5IZqlbb0bHehMOF1JPGqPBIRoCHFQQAvD_BwE

 

On my sons truck we are planning to use a steel bed floor and install it in a set of new replacement panels. We plan to route the filler out and up and make the filler door in the fender. We used a new gas tank from an S-10 2 door-2 wheel drive. A new Spectra tank cost us about $110 a couple years ago. Best to buy new mounting straps as well because junkyard ones are usually hard to get off without messing them up. You can get the tanks with different size holes to hold the electric fuel pump.....so you need to know which pressure pump you will need. and buy the correct year tank. We also bought some hose made for routing the fuel filler.......think we got it from Speedway.

You can see the tank has a vent and when we install the factory S-10 filler tube it has a vent, so just route the vent hose from the tank to the filler. Also, the filler door makes a nice opening when mounted in the fender.