Has anyone welded a sump on their stock tank? I want to use the stock tank if I can, but am running an external FP, has anyone sumped the stock tank or drilled and welded fittings on the bottom?

 

I did. You can buy a universal sump from Summit, but I went to a local sheetmetal shop and got enough stainless to do it for much less. You will have to pull the tank out and obviously make sure it empty. I then flushed it with water about 9000000 times and let a hose just sit in it for over an hour. I wasnt extremely good with welding when I did this so I put a layer of JB weld over the welds to seal a few pinholes I had. One other piece of advise. You will see that I have a shutoff valve. Definetly put one of these on. If you dont and you have to take the line off to either change it, or pull the tank, or change the pump, the tank will empty itself. The valve lets you pull the line and loose almost no gas. I also run a screen style pre filter before the pump and then a canister style after the pump. You will want to run a screen filter before the pump. You dont think anything gets in your tank but the last time I took the screen out just to look at it I actually found a big wasp in the filter. Might have ruined my pump if it went in there.

 

i didn't sump mine i ended up taking out all the baffling inside and at the very back of the tank at the lowest point on the tank welded an AN#8 i'll post some pics later as photobucket isnt working at the moment

 

Thanks! Where did you make that cut to empty the baffling from inside? Picture would be awesome!

 

i didn't cut a hole ended up breaking the baffling up into pieces took me awhile though i remember that lol but i have pics now i used an areoquip steel fitting get the largest head you can for whatever size line your runnin so there will be more to weld around i used #8 with a 7/8 head or bigger this is the back of the tank

 

and i made a return line next to my filler tube here

 

I have a 85 Camaro and want to add the aftermarket sump to the guy. I have put these on tanks before but never in a 3rd generation guy. The reason for the sump is for a electric fuel pump for a Holley FI unit. I want to mount a electric fuel pump outside the tank for easy replacement if nessecary.

The aftermarket sumps I have used require 3 @ 1" holes cut into the bottom of the gas tank to make sure fuel flows into the sump. Works great but will you be able to mount the mufflers back there if the sump is in place on the tank? Never done this on a 3rd generation car and would like to get some information from the Forum here. TIA

 

How hard was it to break out those baffels??? And do you ever have a problem with your pump cavitating??

 

need to take the tank out remove sending unit and use a long pry bar then need to grab all the pieces it takes awhile to get it all out and never caviated before just takes some time to prime it after it sits over the winter which is key/off acouple times then it fires right up just make sure you don't go under i'd say 1/4 tank and you'll be fine

 

 

C4040 competition engineering sump kit. Its a few bucks more than if you were to make your own sump but its worth it for the amount of time saved.

 

it will need tweaking but indeed that's what I used too.

 

What tweaking does it need other than bending of the tabs slightly? I bought the sump but haven't put it in yet.

 

Look at the pic, it's bent about 2/3rds down the length, I had to cut a section out both sides and fold it back together so it fits the bend in the tank.

here..a better pic

 

Nice, good to know. I had not realized it was that long compared to the tank. Thanks for the heads up

 

where does your exhaust go now since the sumps in the way of the muffler??

 

Out under the passenger fender most likely LOL but I can fit a 4" exhaust over the fays 2 and it would need a pipe on the right. or one going to the left a little further back and put the muffler where the cat used to be.

 

ok thanks was just wondering how you were running it

 

I had to trim a little off the tapered end to clear the upper panhard.

 

 

 

 

baffling removed

 

I also have a sumped tank, I didn't make it, i bought a roller 86 T/A for the 9" and it just hapened to have a sumped tank, so I snatched it to. I am using a holly blue pump and a jegster filter....i still have to wire it up to the factory harness......here are some pics....

 

Thinking of doing a sump. What's the reason for removing the baffles?

 

The reason for removing the baffles was because of their location inside of the tank. I had to position the sump to clear the panhard assembly and that just happened to be where the baffles were located in conjunction with the stock in-tank pump pick-up. I was told later that not all tanks have baffles. But in any case, with an external pump, I don't believe that baffles would be needed, unless extreme cornering conditions.

 

I just finished sumping my stock tank, what a nightmare, took forever to get out with all the seized/undercoated fasteners etc...

 

Old thread, but anyone planning to do any welding on a used gas tank needs to apply extreme caution when emptying and evacuating the tank of all vapors. Just a tiny amount of fuel vapor trapped in a corner of the tank can cause a serious explosion when a spark is brought to bear on the tank.



Of course, if you live in California, that doesn't apply; the ****-water they sell for gasoline out there will hardly burn even if you try to light it with a match.

 

I pressure washed mine, filled it with water, let sit overnight, drained out and rinsed again, I lit a bbq lighter stuck it inside and no poofs, all good