Anybody know what size the supply and return fuel lines are for a 91 tb car?

 

They are likely a metric size, however, 3/8" feed and 5/16" return are close enough.

RBob.

 

He might be talking about the fitting size. Its actually a 12mm metric saginaw powersteering fitting. You can get adapters to screw into the fuel fittings on the throttle body and go straight to -6AN fittings. I use these on TBI conversions and external regulator installations.

http://www.jegs.com/i/Russell/799/640800/10002/-1

 

3/8 and 5/16 is what I was looking for. I run a walbro 255 to a return style regulator for a carb. planning another motor build with nos. just trying to calculate if it will support my needs or if I need to upgrade pump and fuel lines.