Hot Rods Tank in trunk

Building 29 Chevy coupe. Putting a Tanks tank in trunk. Any reason not to keep fill neck under trunk lid, or safety mandates running fill neck out side of body? Was going to run vent/ roll over check valve external one way or the other. Opinions?? Thanks

 

As long as you have it vented to the outside and a sealed non vented gas cap that part is good.
A firewall between the trunk and the passenger compartment would be a wise thing to have. That doesn't have to be fancy, just (preferably) a sheet of light metal cut to fit and fastened in.
It seems like one of those made in Japan boxes with wheels I had about 30 years ago had a smallish odd shaped gas tank that actually sat on the hump over the axle behind the back seat with a light metal panel on the seat side and a cardboard panel on the trunk side.

 

On a street car you would need to vent the filler to get rid of the smell of raw gasoline in the trunk

Running the fuel filler/cap inside the trunk is very normal in motorsport .
But the sanctioning bodies require a spill/over flow to vent outside the body [except for a dry-break filler systems]

A common DIY method for an overflow on a fuel cell filler neck is to cut a hole in a common kitchen variety stainless steel bowl for the filler to go through
Then weld a hose tail to the bowl so a vent hose can connect to it.

Here's one we did on a Road Race Camaro

 

You will drip some gas removing nozzle and you don't want gas smell in any luggage back there.

 

My set up in the coupe.

 

I would never put the fuel filler in the trunk...it's just inviting trouble.

 

I would avoid it if possible.
But if I had no option I would make sure the trunk was not air tight, as well as what was suggested above, the tank was vented, there was a firewall in place, roll over check etc.
Keep in mind it can be done, various car makers did it for years. VW beetle had it for decades for one.

 

Sent you a PM

 

A lot of the pickup trucks had the damn tank behind the seat. Make a firewall have a rollover valve and vent to outside.I would put a small pop up filler on it outside

 

A lot of 60's-early 70's cars (Fords in particular) had the gas tank as the trunk floor with the filler between the tail lights or under the license plate. Made pulling up to the pump easy as it didn't matter which side it was on. Can be a little tricky to get the vapor sucking condom style to work though.

 

I've built several 32 roadsters with trunk mounted tanks. I have had no problems. They have all had O ringed sealed caps with roll over valves vented to the outside. Also all filled from inside the trunk. I was just careful not to over fill or splash any fuel in the trunk.

 

Krylon, on those where outside did you vent them on the roadsters?

 

The Reason for Not getting Gas in the Trunk is.........................................are
you Ready..??.........Mice Don't like Gas in the Trunk.!

Just my 3.5 cents

Live Learn & Die a Fool

 

X-2!!
6sally6

 

I hard lined the vent line over to the side and ran them down the inside of the frame rail.

 

I found a SS bulkhead air vent and installed it in the gutter outside the weatherstrip on my trunk.

 

I'm running a tanks tank in my 30 Model A, it has a roll over valve, vent which I vented thru the floor and an o-ring on the cap. A friend has had one in his 32 for probably 20 years without any problems. Works well for me, I also put a plywood barrier between the tank and passenger compartment, not as good as a steel panel but gives some protection.

 

be sure that end of vent tube is higher than top of gas tank

 

Thanks for opinions all.

 

I have one in the trunk, and one under the trunk. But both have fillers inside the trunk. Both sealed no vented fillers, and tanks have not only rollover valves on the vent, but also have a 360 degree coil in the vent line to prevent sloshing out the vent tube.