hey guys, im looking for some help on how i need to plumb my ls1 with the 98 tank. im getting rid of the evap stuff so would this setup work...???
1 feed
2 vent
3 return?
4 vent(to purge tank now??)

and then do this setup??

 

If you are dumping EVAP and already have one vent line then cap #4

You need to have a regulator in the tank to use the tee fitting system shown. 99+ V8 cars did, Im not sure about the 98 steel tank. Pull the sender and look

If it doesnt have a regulator, use the C5 filter/regulator

 

heres the one listed for 98s from autozone, looks different than the 99+,

so im guessing i need the this c5 filter

 

http://m.ls1tech.com/forums/showthread.php?t=443056&styleid=27

According to that, 98's had an intank regulator, so use the tee style fuel lines

Remember, all fbody ls1s were returnless systems, v6's we're return style. If the tank was from a v6, the regulator will not be there and the C5 filter/regulator is required

Also, the neck is longer for 4th gen tanks. Not a problem on plastic tanks, just trim the rubber hose. Steel tanks require splicing the neck

 

i just look at my 4th gen lines and it does have the factory 't' in it already lol
i pulled the tank and didnt even think about what the 4th gen lines look like until i pulled them today
im an idiot

 

Don't mean to hijack this thread, but since we are talking about pressure regulators. Just a curious question, is it possible to use the stock FPR on a TPI with these tanks??

 

Use a v6 sender or gut the ls1 regulator, then use a supply and return line

 

I was gonna use the 98 metal tank from my donor car but I did not want to deal with the metal filler neck. I used the 99 plastic tank. Much easier.

 

A removable neck makes removal/install of the tank hours easier

Lower axle to full droop, pull both pan hard bars, out she comes. To add insult to injury, the fuel line connections are on top, so cutting the access hole is acceptable. It also has a much larger hole for the sender, so multiple pumps fit without divine intervention

Twin pumps in a 3rd gen tank are a feat

 

what do you use to cap it? or can i just make that another vent?

 

Vacuum caps from any parts store work. Put a breather on the end if you want. A second vent won't hurt anything