Need to know if a 95 LS fuel line running from fuel filter to fuel rail is 3/8 or 1/2in.

 

There's a pretty big difference in the size of a 3/8 line to a 1/2 line. You should be able to just put a tape measure on it, but if worst comes to worst, just go to Home Depot and look at their tubing. You may even need to buy a foot of it and take it home.

Having said that, the fuel line on my impala ss is 3/8, so I seriously doubt you'd have a 1/2 fuel line.

Stonebreaker

 

neither of those,its smaller than 3/8s,more like around 5/16s but metric,i think its close to 7mm

 

ok, well the reason I ask is that I need a fuel pressure guage adapter and Summit has one but the smallest outlet is 3/8, so do you think I could squeeze the hose on it??

 

You sure it aint 1/8",most fuel pressure guage fittings are that diameter.

 

yea, the 1/8 is for the gauge itself, but the hose fitting is 3/8