79 Carbureted Fuel Tank vs. 80 FI Fuel Tank

[srwilson]

What are the differences between these two tanks?
What exactly do I need to change on my Carb'd tank to use it with a FI system?

If someone has pictures of the difference or what I need to modify That would be awesome!

Thanks !

[bradartigue]

What are the differences between these two tanks?
What exactly do I need to change on my Carb'd tank to use it with a FI system?

If someone has pictures of the difference or what I need to modify That would be awesome!

Thanks !

The FI tank has the fuel outputs integrated into the tank. The carb tank has the fuel outputs on the (removable) sending unit. I've used both types with FI without a problem though the pump has to work a little harder because the carb output is smaller.

[srwilson]

Thanks, Brad! But I've found a new problem.

I just crawled under the back of the car and I noticed this.


After a bit of scraping the undercoating off I see I'm developing a bit of a leak.


So next question.

I do plan on switching my car over from Carb to FI at some point. I'm just not sure when I'll get around to it, but if I were to replace the tank could I use a FI tank with the Carb until I get time to switch it over?

If not, I guess i'll try and patch this small hole until I get the change over done. Will JB Weld fix the spot?

Thanks!

[124JOE]

yes jb weld it

be sure to clean it well first

[bradartigue]

I personally do not mess with fuel leaks, I'd stop the leak for now with something - JB Weld as noted will work for a little while - but find an FI tank if you plan to switch. FI tanks work fine - you can even plug the fuel ports and install a carbureted Spider's fuel level sender, which has the correct size outputs for low pressure line.

[srwilson]

Thanks Brad, for the confirmation.

I'll go ahead and grab a new FI tank then.

[aevansgatech]

I developed a small tank leak as well last night I didn't notice any leak when the tank was 1/4 full, but now that it's topped off at 4/4 full I'm getting a slow drip. Either I've got a crack up high in the tank or the added fluid pressure is seeping out a small crack in the bottom.

Can JB Weld be applied to a semi full tank?

[bradartigue]

So long as the area is bone dry then yes. But it won't be a long term fix. I don't care what the epoxy vendors say they ALL deteriorate when exposed to fuel. Drain it, take it to a shop, have it welded.

[aevansgatech]

Yeah I agree a replacement tank or weld would be the best. I located the leak at the top of the underside part of the tank. It's at roughly ½ tank.

It wasn't in the budget but it looks like I'll have to spring for a replacement tank