Originally posted by InitialD
Woow, DuBro tubes thicker than Serpent's? I thought the Serpent one was already thick. The GS ones are way much thinner.
Comparing the Serpent one vs. the DuBro, probably has the same ID, but DuBro has a thicker wall that insulates better the fuel, some time I used Serpent tube for fuel line and got several vaporlocks and flameouts.
Those was done because on my engine, the fuel intake needs to be routed between the head the the carb and tube touches frankly the head for some lenght of it and passes heat to the carb. Switched to Dubro in the same fuel line layout and haven't ever had another vaporlock due to fuel evaporation.
Use Serpent fuel line for the pressure intake.