Anyone install baffles in factory gas tank?
 

The gas tank in my 67 GTO is leaking and I have to take it out anyway for repairs. I want to install baffles to minimize fuel slosh away from pickup under acceleration. I want to keep the stock style tank for a couple reasons: already have 1/2" pickup and return in a factory style pickup from RobbMc, want to keep factory fuel gage, need large tank for drag and drive, need trunk space for drag and drive.
I am hoping it is not full of rust and trash when I take it apart. Anyone have pictures from doing this or suggestions? Thanks in advance.
Lowell

I can only envision doing such being a great amount of work and if done having a high probability of new leaks after you get it all stitched it back up.

I used a trick factory tank in my 80 Trans Am. I wanted to keep the "stock" look. Once the car started running solid tens the pressure became inconsistent. After trying a bunch of things to improve the situation I finally gave up and went with a sump.

What worked best was adding a pick up point in the lower left (location probably doesn't matter) of the tank. We used 1/2 inch tubing that extended towards the rear center of the tank.

Waaaaaay easier to just buy a new baffled tank that still looks stock.

hmmm.....who sells them?

Tanks Inc and/or Rick's Tanks and others.

https://www.tanksinc.com/index.cfm/p...rod/prd419.htm


Also instead of modding your tank easier to start with a new cheap Spectra tank and add baffles if you can't find one already with baffles. But unless you are autocrossing not much need I see for baffles.

Not many folks making those in 1990

These young guys are spoiled lol

I just pulled my stock tank that I modified with 1/2" pickup silver soldered in with return and drain plug added. What a pain. After I added the back brace to the 9" I could not get it out. I put the frame up on blocks and pulled the coil springs and was barely able to jack it up with jack backwards under the car and get it out.
A 5 gallon fuel cell is going in.
Not sure which pump I am going to put in. I have a 160gph Speedmaster Mallory copy that would be the easiest. I can just use the 1/2" return from the carb mounted regulator already set up.
Or have a used BG 400 pump I bought here. You can return right from the pump on those things but going that route is all new to me. 5/8 to the pump and return.
Robb Mc told me they did a test on a Pro Stock car and the fuel required was not even 150 gph.
So I have a fuel pressure gauge and 2 vacuum gauges, one crankcase and one manifold set up on the cowl for testing. If the 160 won't do it the big pump is going on.
Think I might get some sort of camera set up on the dash so I don;t actually have to watch them down the track.
I also did my stock tank mods back in the 90s. Had to do it all yourself in those days. Part of the fun of Hot Rodding IMO.

New rust free tank plus a Holley HydraMat sounds like a good combo for you.

I'd be trying this. I dropped a Holley Muscle car EFI fuel module in my 66 tank and i'm astounded that it's never surged since I put the Sniper2 on and i've run it pretty low on fuel. The module is a drop in replacement for the level sender that has a Walbro 255lph fuel pump and small hydramat on the suction side of the pump. Very happy with it so far!

Another option is a new tank with an in tank electric fuel pump. No more problems with fuel delivery and the tank looks stock. Tanks Inc sells them and not as pricey as you might think.

I have a custom Tanks,inc tank with the normal baffles etc.
There is a place near Chicago that sells a oval shaped DUAL fuel pump mount that bolts
in place of the normal Tanks,inc fuel mount/pick-up.

I mounted two electric fuel pumps on the mount but had room to mount 3 EFI pumps.

One pump would cover the fuel requirement but I wanted two pumps in case one failed on the road. Simple power switch to each pump allows swapping to the other fuel pump (IN SECONDS) if an issue.

Tanks, inc Pontiac Tank With extra baffling, dual 400 lph pumps, custom mount for the pumps, and fuel tank fuel sender works with factory gage.

A 1000+ HP capability fuel system (Vortech Supercharger) that looks stock. Tank is baffled as received from Tanks,inc.

Tom V.

Interesting thought regarding the 2nd pump.....what do you like to run for a regulator?? I've had mixed success, but ultimately went with Magnafuel/Magna Flow for steady and predictable pressure control.

A new tank would be the way to go. I have a Tanks Inc 20.5 gallon in my car and I’m happy with it. I’m using the Holley 12-173 kit that has dual Walbro 450’s. I went with a floatless sending until for the fuel level. A small kick-out had to be added to the tank get the dual pumps to fit right. Extra baffling was added as well.

I just finished installing the Tanks Inc tank w integral pump and fuel sending unit. A very nice piece. I should have done this a long time ago.


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I was having fuel delivery issues with my 67 Impala SS 427 (clone). I hate the look of the dropped sump that you weld to the bottom of the tank and wanted something more clean looking and stealthy. So this is what I did and it works mint.

When cutting and welding on gas tanks, you gotta be safe. so, I emptied the tank of gas and got it wiped out real good, then hooked up my shop vac hose and ran the exhaust into the tank for about 15 minutes.

more details

Nice work, I like it. Nice in tank semi sump-baffling. Should be able to keep the pickup covered at all times.
Kinda curious why you went with the brass bulkhead fitting for the outlet though.
Has gaskets, could leak someday.
With all that welding you could have welded in a steel AN fitting or NPT coupler.

All the welded bungs I used are NPT fittings. I used brass tube adapter fittings that screw into these weld fittings to couple the fuel lines to the tank. I could substitute NPT to AN fittings (adaptor fittings) if I went with AN hose, but I didn't go that route. I did use JB weld "fuel resistant" epoxy to cement the internal 1/2" line together and also where the 1/2" line meets the weld bung inside the tank. This set up has been in use for several years now with absolutely no issues.

The only other issue I was having was finding an electric pump that would survive long distance driving, 4-5 hours continuous driving. I smoked 2 pumps. Called several different manufacturers for recommendations on a pump and all but one said they will not live for continuous use. Weldon has 2 pumps that they said would work, but decided to run a Clay Smith mechanical pump, problem solved.