it can be done.... Have had it done for several years now.

 

You can't just chime in and say you've already done it without giving some details.......

We need details..

 

the tanks from 3rd gen to 4th gen are completly interchangable, you should have no problem.

 

pics would be nice, if u dont have any of doing it, even one of it in there would be cool

 

ok, ok..... here's the scoop. (from the wife..... not Tim)
we installed the 4th gen tank the same time we installed the LT1. I thought we had the tank in before the LT1. The tank size is the same, but as far as hooking it up with 3rd gen stuff I cannot help.... sorry.

 

ok im gonna reply to bring to the top and so I can have email notifications.

 

aight, so were back to no one having done this? well atleast we know its easy as far as mounting, still waiting for a guinea pig tho

 

I've got to drop my tank to figure out where a gas smell is coming from (I'm almost positive it's the neck). Any ideas what the major roadblock to a plastic tank would be? If the plastic tank isn't a fairly easy "bolt in" will a 4th gen metal tank go in easier? Are there any advantages to a 4th gen metal tank?

 

Ok, this hasn't been covered yet, so... How about any modification to install it on a carbed car? I won't need an electric at all, just the block mounted mech pump should be fine.

Will my fuel pickup system mount in place of the stock LS1 system?

Any insight would be great!

 

I'm going to be doing a similar swap, LT1, T-56, and 4th gen rear. I figured since I'd be removing the rear end any I might as well install a new pump, and I never even thought about a steel tank rusting. But were you able to use the 3rd gen fuel lines/wiring or did that all have to be changed out? Thanks, Joe

 

Did you use the tank out of the LT1 car or was it a 99 and up? I was reading on camaroz28.com, and there were some LT1 guys talking about doing the swap. They said that the tanks are several different tanks. Obviously the LT1s had the metal tanks. The 98 LS1's had Metal tanks also, but I believe that they said these were different than the LT1 tanks. They also said that the V6 tanks were different. I was just basically wondering if someone had tried this yet to know whether the plastic tanks would phyisically bolt in without modification other than the fuel neck, or if you would have to rig up mounting.

Ben

 

I received a 99+ plastic tank from Big Jon..but havent had a chance to check it out on the car....will when I get a chance and let yall know what happens......I did however go to the dealership and they said the tanks were physically the same in the v6 and v8 cars.........so perhaps the difference is just the fuel pump itself.....but I plan to get the fuel pump kit from racetronix anyways. But like I said...when I get a chance i'll see what I find out.

 

I'm in the process os replacing my fuel pump and this is something I am thinking about doing (4th gen tank). I'm moving to an external fuel pump so I wont have to worry about that. I want to do this mainly for weight savings (heard it was 11 pounds lighter). Does anyone have any more info on the differences between the 93-97 and 98+ tanks, and the v6 vs v8 tanks? Thanks!!

 

BTTT,

I just bought a 91 Vert. no motor or tranny. I have to drop the tank to pull the TBI pump so I can use my inline efi pump.

If I can find a 4thGen tank local I'll be the test dummy. No biggie. I have to pull the rear to but mine in also.. same with the stock Exh. So this is the perfect time to do it.

Hard part is finding a local Junk yard with a 4thGen

anybody want to send me one? I'll trade ya. A plastic tank for some powdercoating work. If you do a search you will find Pleanty of pic's of my work.

If ya dont want to search just head here
www.cecoatings.com/images/coatedparts

Thanks
Chris@cecoatings.com

 

http://www.cecoatings.com/images/coa...s/DSCF0057.jpg
NICE CUP!

 

BTT. I am curoius if the old sending unit can be used to allow the existing return line to be used. Has anyone had success with this? My fuel pump bit the dust. If possible I would like to do this mod now.

 

I belive the tanks will fit but what about the in tank fuel pump, has anone heard from racetronic yet?

 

Wow, old thread. I remember following this long ago. A lot of people chiming in saying they did it, but no one giving some basic clues to do it. I am going to try it for my vert, but will have to wait awhile till the rest of the car is done (paint, etc...)

 

no one tried this yet

 

hi guys i see alot was not accoplished here>>>...
I can get my hands on a 99 (6cyl i think) plastic tank....but i have a carb car with a block pump so can i do it??? any suggestions

 

I would get it. If the fuel pump complex is interchangable that would be useful information to al of us. I imagine a carbed car will have the same sending mechanism without the fuel pump.

 

I also need info about the carb set up. When someone actually does the swap please do a tech article or detailed discription with pictures....

 

haha, the post lives on! any one actualy done this one yet?
Fatal88, I sent you a PM asking about it. Just hoping it sends you a mail for the reply.

 

Yeah i also would like to know about the manual fuel pump and how it would work with it. How come no one has done this yet?!?!

 

Not much help ,but got this plastic tank from an 01 f-body.Ive got a carb eng in my 84.The 1st thing i noticed is the hole where the pump mounts is much larger.it swallows the stock 84 unit.Havent figured out how to adapt this to the plastic tank.I was hoping someone had already done this.Might just sell the tank if no ideas come to mind.BTW that black box is the vapor canister & it snaps off(w/some good effort).

 

or you could have just left the vapor canister on there, and removed the crap up front.... there by having more room up front, less weight up there, more weight towards the rear, and less lines running the length of the car.


that is, ofcourse, if it fits with it on there.. :lala:

 

Would this be emissions legal tho? I'm just curious if the smog tech would flip out if there wasn't a vapor canister in the engine bay. Would it be possible to see the canister with the tank installed (assuming it fits of course)?

 

ahh, you're in cali... hehe, honestly, i donno...

on one hand, if you're dropping a entire LT1 drivetrain in, it probly is, but if you're just swapping the tank, i donno the rules on upgrading the emmissions system...

i dont have emissions or even basic inspections here, so i usually dont think about that kind of thing... i just like vapor canisters because it doesnt let my gas evaporate.....

but i hate them being underhood.. they're right where my CAI and intercooler pump need to go.

 

ttt

 

Great idea!
It looks like from the picture that the cam lock and sender pump assembly will fit from the 3rd to th3 fourth gen just have to check to see it it reaches the bottom ok.
the Walbro pumps at 307-195 gph - 340-225 gph
these are used for the buick GN's. You can run a hotwire kit. Which is a larger wire from the alternator out put run down to a relay mounted next to the tank it gives your pump 12+ volts.
You can buy hot wire kits and stuff like that from Casperselectronics.com look under the catalog at 89 Turbo TA parts and the hot wire kit should work for that I already ordered one. And the tank is at the junk yard, Im working on the price.

 

Im should be picking up a complete tank and so on, in the next week or so to go with my LT1 swap ill post pics and info and so on, when I get it completed.

as from this thread it still looks like maybe only one person has done it, I believe FlyNLOW but not sure.

 

Well, I have read all of the post and no one has actually done this yet, everyone just keeps talking about doing it, wish I had the money right now to try this out. Probably this summer for sure though. Anyway, I hope someone will let us all know if they actually get this done. They should do a tech article on this. Keep this topic alive so we can share ideas and actual experiences doing this so we can all attempt this if possible. Thanks! :hail:

 

What do we do about the fuel gauge/fuel sender problem?
Our cars use a 0-90 ohm fuel level sender and the 99-02 LS1's used a 240-40 ohm fuel level sender.

Glad I didn't order that AutoMeter Ultra-Lite Fuel Level gauge yet.

 

Alright guys... no, I have not done it, so I can't start giving deatils, but I will be doing it soon.

This summer when i get around to finsishing up my car, I will do this swap. The only thing is, I am running a carbed 350 crate motor, so all I have to do is throw out the fule pump and put a hose in there, so I don't need all that complicated stuff. I will be doing a 4th gen dash and console swap at the same time, so I will see if the sending unit for the tank works. If not, I would just replace the sending unit with the one from the 3rd gen tank. I don't care how it fits, I will make it fit. Don't know how helpful I can be with this since mine is more straight forward, but I will see if they work.

 

Just to let everyone know....

I have a 4th Gen gas tank in my car, from a Trans AM

The car is in North Carolina right now at ThirdGenResource.....I will have details and pictures later......

I'm not sure the specifics of how to fab it, but i also have a LS1, T56 and a 4th Gen rear, so that may make some of it different....

Check out "So i dropped my car off at ThirdgenSrouce today".....It's in the Appearance forum and details about the swap are posted there......

 

Sweet, finally someone has done it. Let us know the details when you get them. Thanks. :hail: :hail: :hail:

 

Great news! I was planning this for the sumer. Please get more details when you get a chance.

 

Looks like the last post was on 2-12-04.
FLYNLOW, any picks or any idea on which parts were used?
Which sending unit or fuel pump and assembly.
Was this topic moved or a tech article written. Would hate for this topic to die before someone actually figures it out.

 

Please don't let this topic die. Anyone who has done this please let us know how things went, or write a tech article. FLYNLOW92rs, for sure post some pics or something, give us all the details as soon as you can.

 

The minor issues are the fuel line connectors are different but you can get adapters for that. The fuel pressure regulator is at the tank, so you'll have to eliminate it.
The biggest hassle is the 99-02 plastic tanks all used a 240-40 ohm fuel level sender instead of our 0-90 ohm one. So you'll have to rig the newer sending unit with an older style fuel sender.

 

Any ideas on how to rig the newer sending unit with the older style fuel sender? Is there an easy way to do it, or is there a kit out there yet?

 

I will post all the pictures and as much info as i can get once the car is back in my posession.....

But i'm not sure on the fuel line fabrication, since i'm using 4th Gen fuel lines in my car.......as seen below

 

Here's the site where the guy discusses his problems with swapping in a 4th gen plastic tank into a 97 V6 firebird. Alot of the same problems relate to our application. Go to the V8 swap link and read under fueling and see pics.
http://www.dxsoftware.com/magnus/
HTH

 

Thanks for the link. FLYNLOW92rs, thanks for keeping us updated. I can't wait to do this swap hopefully this summer.

 

I was discussing this very topic with my friends from SouthBayF-bodyAssociation tonight at our monthly meet. Several of the thirdgen owners were more than intruiged. I would like to pursue this as much as possible. I am in need of a new tank and it seems the cheapest alternative to this LS1 tank swap is a replacement from someone like napa auto which would run appx 200+/-. I have seen 1Aauto on ebay offers replacement tanks for EFI 3rd gens for 229 plus 20 shipping. But they are only 14 gallons. Does anyone know if the reduction in capacity by 1.5 gallons does anything good for us? The only thing I can think of is they chopped 1.5 gallons of capacity off to ease install. making the tank smaller and avoiding the infamous filler neck problems.... Can someone chime in on this??? Thanks fellas, really looking forward to some good news

Will

 

Ok I did the forth gen tank with my swap as for fit they are exactly the same but the filler neck is longer on the forth gen tank than on the third gen and you will not be able to shut the door with a cap on so for now im using a plug my tank was from a 95 camaro so its metal as for the fuel lines big to big small to small and evap to evap its easy to figure out I cut the plastic and glued them with a hose clamp to the metal lines and for the wireing all the colors are the same If you have any Qs just Im or PM me I will try to get some pics

 

Were not really interested in the 93-98 metal tanks. It's the 99-02 plastic ones were trying to figure out.

 

its still the ame body on the 98 and up so i would assume the tank is the same they did not change the contruction of the back end of the car at all just differnet parts and as far as I know the paltic tank is the only difference so it should fit and you can take the evap tank off and use your stock one up front

 

93-98 tank=metal with attached filler neck
99-02 tank=plastic with seperate filler neck that attaches to tank via coupler. Also rumored to be slightly larger volume than previous tanks with exception to the rumored 18 gal tank that some "special" 1LE's and test mules recieved. Which is not a problem of fitting our cars because from the seam underneath the front seats all the way back to the seam at the taillight filler panel....the floor structure is the same for 3rd gens and 4th gens. Plus flyinlow92rs has now proven that the tank will physically bolt into a 3rd gen.
The side body panels on 4th gens flare out more than ours do, so I can see where the 93-98 tanks filler necks would pose a problem.....but the plastic tank is a whole different animal. The seperate filler neck can be shortened and then reattached. At least thats what I'm gonna try. Actually since I'm planning on replacing my gas door with a fuel hatch from a crotch rocket, would have to modify the filler neck anyways.

 

I am interested to know if I can still use my thirdgen sending unit in a fourth gen tank. Any one know anything about this?