[Scott65]

Posting this in the street section, because my car is 90% street driven, or more. That being said, it will 60 ft in the 1.47 range, and that was about a hundred hp or so ago. No recent track times, but I expect it to be low 1.4, or high 1.3 60 ft now. Question is, do these tanks have good enough internal baffling that I can expect not to uncover the sump, and not have to have a half a tank of fuel to accomplish that? I run a sumped tank now, and have no fueling issues, but I've been considering an in tank set up. But I don't want to take a step backwards by trying to take a step forward... Any of you that have any experience at this performance level with one of these that could share you're experience I'd appreciate it.

[Formulajones]

I haven't had any problems like that to date and we've used a few of them.

I will say though that we generally don't like to race with less than half tank of fuel, simply because we play with small tire cars and the extra weight helps the 60 foot times and ET's more than it hurts the ET carrying that weight down track, I learned that running stock tires on a few cars here. Plus it always seems we get to the track at events where they don't bother to do any prep.

[Scott65]

Thanks for that. I don't have a fundamental problem with USING a half a tank, but I would consider it a failure if I HAD to use a half a tank. Hopefully that makes sense.

[Formulajones]

Understood. I wouldn't expect a problem with something below a 1/2 tank But I can't remember an instance where we tried that for the reasons I mentioned above. Our stuff is in the 1.5 60 range without hiccups and I suspect dad's will be a little better than that with the new engine setup once he gets comfortable with it.

[Scott65]

Have you looked closely at the baffling arrangement? If so, maybe you could give an idea. I'd love to see a picture of the internals, or a cutaway view, but haven't found anything like that.

[Formulajones]

There is baffling there, and the spot welds on the bottom of the tank give an idea, but I'll have to go through some pictures and see if I snapped some pics of it or not. The opening for the pump is only about 3" diameter so not easy to view it.

I have another setup coming soon for one of my own cars so I can make more of an effort looking at that feature.

[JLMounce]

I haven’t had any issues in any type of driving with my tanks inc tank. The internal sump is over 3/4 the total height of the tank and there is additional longitudinal baffling in the center of the tank. Even with your launch it would require the tank to be near empty to uncover the pickup.

Additionally the fuel hat design is such that your return fuel flows back into the internal sump, making it that much harder to uncover the pump.

[Scott65]

Good information, thanks. Formula, if you have an opportunity, and its not a lot of trouble... A picture would be appreciated when u get the next one.

[JLMounce]

Every Tanks Inc tank I've seen (I own 2) has been setup like this diagram.



The sump typically has about an inch and a half of space from the top of the tank to the top of the sump wall. It also has a lower fill tube below it with the sump about an inch above the tank floor.

The mid baffle runs the entire length of the tank and is the same height as the tank. On the top and bottom it has notches that are approximately an inch to inch and a half long, spaced with about half an inch between them. It looks somewhat like a castle wall.

The sender that you stick in the tank is typically adjusted so that when it reads E, the fuel level will still be covering the sump lower fill tube.

The fuel hat on my F-body tank and my wife's A body tank is situated in the forward right corner of the sump and the sock is designed to be situated pointing outward to the side of the car. There is however enough room to situate the sock completely aft, which is what I would recommend for a drag race specific application.

You can make this tank even better by putting a larger sock or something similar to the holley hydro mat at the bottom of the sump.

With a properly size quality pump and lines to your EFI system, I would not hesitate to use this tank in your situation.

For hard core handling situations, it would be nice to have at least one latitudinal baffle. The sump is good enough that for most people that's not a huge concern though.

[Scott65]

Thanks for the illustration, and detailed explanation, that is helpful.

[Tom Vaught]

I have included three pictures:

One showing the internal baffling in the tank.
One showing the recess in the top of the tank
one showing the whole tank.

All of the A-Body Tanks are similar.

The "Wall" that you see is in line with the recess in the tank pocket.
The holes in the tank, look at the left side of the picture are several inches up from the tank floor.
The Pocket is only about 8" by 6 inches so the side baffles are minimal but that front section is 1/4th of the volume of the whole tank. no need for a rear sump type add-on deal.
Only issue I see id there is not much room to install two of the efi pumps without modding the fuel pump hole.
I have one 450 liter hour pump in my tank.

JLMounce, your illustration looks nothing like my GTO tank and the pictures posted.

my pump and tank sender are in the center of the front of the tank.

Tom V.

[Scott65]

Thanks Tom. I think one 340lph pump will suit my needs. And if I make use of all of that, I'm in block splitting territory anyway... My top end stuff will eventually tear up the bottom end I'm afraid... But I'll have a nice fuel system to rebuild on...

[Scott65]

One other question... Looking at the Tanks Inc website, they show different part numbers for a 65 Tempest vs the GTO. Anyone know why? My guess is the fuel filler location... Anyone know for sure? I guess I should break down and call them.

[JLMounce]

Originally Posted by Tom Vaught

JLMounce, your illustration looks nothing like my GTO tank and the pictures posted.

my pump and tank sender are in the center of the front of the tank.

Tom V.

Yeah it was a 5 minute ms paint job from memory. It’s still a basic representation of the tank style.

[Tom Vaught]

Nothing wrong with the basic info, Mr Mounce. Every little bit helps.

Tom V.

[Scott65]

And of course... Summit doesn't offer the tank kit with the 340lph pump. Always something

[JLMounce]

I purchased both my tanks from Schwartz Performance. Good pricing, fast shipping.

[Scott65]

I'll check them out thanks for the lead.

[Hooter]

I had similar sump/baffling concerns and went with a Ricks Tanks unit after advice from a lot of the Drag Week guys.

[Scott65]

I will check those out as well. Pretty sure they're not in my budget though.