Hey Doug,
We went with a 22 gallon '70 Mustang tank from Rock Auto. I think it was a $140ish. We used Jniolin's installation process. We had to move one brace & shave a little off of the rear frame - fit's between the rails just fine & it doesn't hang down too low. Nice to get 40% more range than stock.

This style tank will put the filler coming up in your bed. That works for us - just remember to fill up before you load that couch in there. Let's talk sending units before finalizing.

Ben in Austin
1950 F1

 

Thanks for the info, Ben! I don't want to hijack this thread, but I have heard people have issues with sending units and trying to use original gauges (I'd like to stay original on the gauges, but can't afford the rather pricey repro ones).

 

Finally got to drive it and it runs great! No problems with all the new fuel system parts.

Looks like I will need to vent for filling. I went to fill it up and had a hard time. I had to fill at the slowest speed and it still backed up in the fill tube.

The vent fitting in the top of the tank is 1/4" FIP. I would like to use 5/8" hose for a vent but I don't see a 1/4 MIP x 5/8 barb fitting anywhere. Is there such a thing? Will a smaller hose be enough to vent it?

 

Any way to drill out the bung and tap it for 1/2" NPT? You could put a common water pump fitting in there and use 1/2" or 5/8" vent hose. You would need to run the hose up high on the filler tube above where the open end of the gas station nozzle would be during fill up, similar to the filler tube picture posted earlier.

 

I would have to drain the tank to re-drill it. I would be afraid of getting chips inside the tank. Is a 3/8" hose big enough to vent it?

 

Running any hose larger than the opening for the fitting will add no benefit. Do you think a larger hose would improve anything when it has to pass through the smaller fitting? I am just asking because the bigger it is, it must be better mentality makes no sense to me.

If the fill fitting at the tank is a hard 90 degrees like it looks in the earlier picture you posted of the tank, a vent hose may not help you any as the fuel will back up to the auto nozzle and shut it off not matter how big of vent hose you run. You might have to address how the fuel enters the tank to fix your issue. Fluids do not like to flow around hard 90's.

 

Yes, it is definitely a hard 90 on the fill hose. I'm not sure how I could change that.

 

Do you have enough room to change the hard 90 to a sweep 90? The idea is to reduce any turbulence in the fill stream.

 

Not sure. I will have to see if there is a way. Maybe if I use some hard pipe too.

 

Exhaust tubing makes good filler hard pipe. It already has the right type bends to smooth flow, comes in many sizes, is inexpensive. You can buy just bends or cut a section out of a formed pipe. If you use pipe with production bends that are compressed on the inner surface, make sure you cut it at a full diameter section so a rubber connector will not leak or use smooth full diameter mandrel bends sold for building headers and high performance exhaust systems if you need just a section of a bend. Many muffler specialist shops have benders and can bend a custom shape for you.

 

Thanks AX, I had a piece of pipe bent today at a 60 degree angle. I installed it with a small piece of hose at each end. Should be have better flow for filling. I am going to vent it too, couldn't hurt.

 

Venting it into fill neck is a good idea IMHO, makes filling easier and gives warning that you are approaching full rather that backing up fill neck all down the side of the truck. If I had my druthers I would have the vent tube extend 1/2" into tank. I had the experience of filling up an unvented tank very full on a hot day, and as the cool gas out of the ground was heated by the hot pavement the gas expanded and overflowed onto the ground for about 10 minutes. Seemed like forever as I waited for it to stop, worried that a hot part or a spark would burn the vehicle down.

 

I am ordering this today. Mid fifty recommends this vent:



and this...

 

Maybe I'm missing something here, but I don't think the pictured vent is what is going to solve your fill problem. That looks to be a vent for a tank with a sealing fill cap, the plastic filter looking part is likely a one way valve to let air into the tank as gas is used while preventing fumes/air from exiting, say while parked in a garage? If so it would not provide a way to vent the tank while filling, or reduce the likelihood of overflow from overfilling. To vent the tank for filling the vent is usually routed to a connection in the filler neck just above the end of the pump nozzle. This does not vent the tank when driving so a second vent like above or a vented fill cap is used for that purpose.

 

Hi All,
This valve is designed to vent when the tank is being filled and will prevent fuel from leaking from your fuel tank in the event that the tank turns over.