i was wondering what size the fitting was on the original fuel lines that come off the stock tank on an 88 firebird. i wanna run a braided steel fuel line but im not sure what size fittings ill need or if ill need an adapter fitting. the hose i wanna run is a -6 an so could anyone please help me out thanks

 

I'm quite sure that it is a metric thread, and it's either going to be 14mm or 16mm. I'm pretty sure it is 14mm x 1.5 thread pitch. I think I found the fittings you will be needing.

http://www.anplumbing.com/Adapters/Metric-25.html

I think you will need the 9894DBH Female Metric W/ internal Oring seat to AN male adapter. IIRC, the sending unit side of the line has the male end with the o-ring. this adapter should screw on to the line coming off the tank unit and has the AN -6 male nipple for the -6 line to connect to.

 

ok great thank you. ill be going with a holley 750 double pumper. im not quite sure if ill need the other lines would you happen to know if i will?