Ok, I know there was a LONG thread about this a while back in the Body and Interior section, and some of the things that came from this were:

-98+ cars have plastic tanks
-there's some speculation that the filler necks are different lengths
-plastic=lighter, not necessarily good in a rear wheel drive car
-plastic=no rust
-4th gen tanks don't have a return line
-phyisically, 4th gen tanks will fit


But has anyone actually done the swap without swapping in a 4th gen engine? I know Fatal88 has done it, but he swapped in an LT1 when he did it, and later an LS1 I think. Has anyone kept their exhisting third gen engine and successfully swapped a 98+ plastic tank? I want details.

Someone speculated that the opening was the same size and a third gen fuel pump could be used....

Anyone have any information on this?

Mathius

 

bump

 

i couldnt get anyone to reply on a thread that i replied to, so if i dont find out in about 4 weeks im going to go to the junk yard, find the tank, do the conversion my self, make it work, and write a nice tech article, but if anyone else did it save me some headaches.

 

Good deal. Im thinking about trying it myself. I can see alittle rust on my tank. Mid as well try the plastic one.

However I have heard the sender for the gauge is much different. The ohms it reads are much higher. Have fun making that work.

 

i get my dad to do the electrical. my car seems a little to easy for him after he gets home from work.

 

Autometer

PS Im trying this swap as well, but not for maybe a month or two, ill post something if I have swapped and don't see any other info.

 

I will try to answer these in order.

All LS1 cars came with the plastic gas tank. I am pretty sure my LT1 has the plain old steel one.

The weight difference between the two is negligable. I would not even consider it to be an advantage.

No rust is a good thing so storing your car on an empty tank should not hurt anything.

Some 4th gen tanks DO have a return line. The LS1 cars DO NOT. However the vette LS1's DO. LT1's have a return line just like 3rd gen TBI/TPI cars.

I am not sure on the fitment. I can't see there being any serious difference between the two but those are always famous last words.