Return line size
#6
TECH Resident
iTrader: (2)
I know the '99 & up Vette fuel filter/regulator is 3/8" supply, 5/16" return. Which was the same sizing as my bone stock 1996 GMC pick-up truck, with a 4.3 V-6 in it, had for standard steel tubing fuel line sizing. Not sure, but if my memory recalls, these were outside dimension tubing sizes. Which I remember as being odd, because hose, etc...is always measured as inside diameter. Just pay attention to this when buying fittings & hose.