LS swap fuel issues

[hath]

And the Walbro GSL392 has an inlet/outlet of 5/16" yet the connection point at the fuel rail is 3/8, shouldn't I run the whole system at 3/8?

[mongocanfly]

I ran my entire system with -6an....equivalent to 3/8"..

[BR3W CITY]

Originally Posted by hath

And the Walbro GSL392 has an inlet/outlet of 5/16" yet the connection point at the fuel rail is 3/8, shouldn't I run the whole system at 3/8?

The pump uses metric I/O which is 10mm, and not a removeable fitting, its part of the pump housing. Depending which way you buy the pump (multiple companies sell the same rebranded pump, some as "kits" with different fittings). Usually it'll come with a pair 10mmx-6 fittings, which is 3/8 feed for the system.