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08-01-2022, 02:59 PM | #1 |
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Adding a Tap to Gas Tank
Any suggestions for adding a second gas line tap to the stock gas tank for a Tudor? That is, without removing the tank from the car.
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08-01-2022, 03:11 PM | #2 |
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Re: Adding a Tap to Gas Tank
Why would you want to do that?
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08-01-2022, 03:14 PM | #3 |
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Re: Adding a Tap to Gas Tank
Don’t do it!!!
Your asking for a number of problems along with ruining a gas tank. Why? |
08-01-2022, 03:18 PM | #4 |
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Re: Adding a Tap to Gas Tank
1. Drain the tank. Leave the cap off and let it air for a while.
2. Use argon or dry ice to displace all the air in the tank. No oxygen should be inside. Using dry ice, lightly put the cap in place to contain the carbon dioxide. 3. Use a sharp punch to punch a hole where you want the new tap from the outside of the tank. The object is to bend the metal into a cylinderical shape with the inside diameter to match a 1/8 NPT pilot hole. 4. Tap the hole with the 1/8 NPT tap. Use Permatex sealant on a brass valve with 1/8-NPT on one end and whatever you need on the other end. The alternative is to weld or braze a boss onto the tank and drill and tap the boss. Do not use solder. But this is going to create a mess and is best done with the tank out of the car.
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. Last edited by nkaminar; 08-01-2022 at 03:25 PM. |
08-01-2022, 03:39 PM | #5 | |
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Re: Adding a Tap to Gas Tank
Quote:
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08-01-2022, 03:40 PM | #6 |
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Re: Adding a Tap to Gas Tank
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Welding something thick to something thin is not as easy as welding two pieces that are the same thickness. This is even more difficult if the metal is corroded on the inside. When they corrode, the bottom can be where the most corrosion is and therefore the thinnest metal in the whole tank. A person would have to miss the baffles as well. My own conclusion is that this is not a good idea. Having some experience with internal tank repair I would not try to do it myself even if the metal was good in the bottom. A person is just adding a potential leak spot for a non essential item. Last edited by rotorwrench; 08-02-2022 at 09:47 AM. |
08-01-2022, 03:52 PM | #7 |
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Re: Adding a Tap to Gas Tank
Just add a T where the shutoff is.
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08-01-2022, 04:57 PM | #8 |
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Re: Adding a Tap to Gas Tank
The shutoff valve screw into the gas tank IS a pipe thread?
Maybe be careful your passenger doesn't hit his/her knee on the valve after appropriately lowered? Joe K
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08-01-2022, 07:37 PM | #9 |
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Re: Adding a Tap to Gas Tank
I am also interested in why you want to do this. I like J Franklin's idea of adding a T. I think Rotorwrench's warning are all valid.
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A is for apple, green as the sky. Step on the gas, for tomorrow I die. Forget the brakes, they really don't work. The clutch always sticks, and starts with a jerk. My car grows red hair, and flies through the air. Driving's a blast, a blast from the past. |
08-01-2022, 09:13 PM | #10 |
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Re: Adding a Tap to Gas Tank
Put a fuel pump on it
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08-01-2022, 10:17 PM | #11 |
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Re: Adding a Tap to Gas Tank
I suspect he might be wanting the second valve so he has a "reserve" of fuel with one tap higher than the other.. If that is so, there is no need for a second valve, just find a valve with two "on" positions and put a higher intake on one just like VW did years ago.
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08-01-2022, 10:31 PM | #12 |
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Re: Adding a Tap to Gas Tank
A lot of good information here, thank you. Nkaminar and Pete, I appreciate your best ideas. Rotorwrench, I appreciate your input too, even though you basically are saying don't do it. J Franklin, the tee would probably not work due to the flow but maybe.
I did not tell you that it did not have to be in the bottom of the tank and this might change some of your thinking. However, you will probably ALL think I am an idiot because I am looking at the Holley Sniper fuel injection system which requires a return to the tank. So the return can be up high and should be essentially no pressure. Again, thank you all, I am still considering the options including forgetting about it. I originally wanted to mount something like a metal radiator overflow tank up high under the hood that would receive the return flow and be "tee-d" into the feed line thus be close to the height of the gas inside the tank but provide a flow relief volume. My fear is that this would overflow depending on the bypass return flow. |
08-02-2022, 05:08 AM | #13 |
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Re: Adding a Tap to Gas Tank
Mount a 32 ford tank in the rear,run a fuel pump for your sniper. Someone probably makes that tank already set up for a return line.
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08-02-2022, 07:09 AM | #14 |
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Re: Adding a Tap to Gas Tank
^^^ what Wick said or use a fuel cell. You need an accurate electric rpm feed and cut in an O2 sensor..
EFI is great, but for that price I’d tough out a Holley 94,tuned correctly they ‘communicate’ with the engine by vacuum using a power valve..early tech.. |
08-02-2022, 07:51 AM | #15 |
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Re: Adding a Tap to Gas Tank
Wick,
I wish I could. I have not seen a mount that didn't require welding to the frame which I can't do. Plus the cost makes this project too expensive. Jack, I have an O2 sensor based air fuel ratio gauge mounted to try to tune in the Stromberg and I think I am making progress. The supercharger is throwing me off in traditional tuning techniques. |
08-02-2022, 08:16 AM | #16 |
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Re: Adding a Tap to Gas Tank
Emulsion tube carburetor like a Stromberg hard to tune with a blower.. how are you running it? Draw through?… EFI definitely will work. Depending on body style you can buy a bolt in fuel tank.
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08-02-2022, 09:56 AM | #17 |
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Re: Adding a Tap to Gas Tank
There are also saddle tanks available that fit underneath the running board aprons. I've not used them but it may be a way to go without being obvious.
I've cut the tops off of several model A tanks to repair them for corrosion damage. This allows full access to the inside and would help kill two birds with one stone since most tanks are pretty rusty inside anyway. Until some company starts stamping out those complicated tanks and welding them together to hold fuel, we are stuck with these 90+ year old units. Last edited by rotorwrench; 08-02-2022 at 02:28 PM. |
08-02-2022, 12:45 PM | #18 |
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Re: Adding a Tap to Gas Tank
Jack,
I am drawing through the Stromberg. Right now, I am increasing the power valve size to richen up the mix under hard accel. When I am holding constant speed, I am running on the rich side. Once I have good numbers under heavy accel, I will try to lean out the steady speed a little, maybe one step leaner would do it. I don't want lean out the mains until I make the power valve a little more rich. Rotorwrench, I was trying to avoid adding gas tanks of any kind. Thanks, Gene |
08-02-2022, 02:06 PM | #19 |
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Re: Adding a Tap to Gas Tank
Heat, flame, sparks and gas tanks don’t go together! Take it to a radiator shop that repairs gas tanks and let them do it.
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