Yopper that is why I have resisted making changes.
If one looks at most inboards the original setups are often:
Metalic fuel line from tank to seperators.......metalic line from seperator forward to shut off ball valve. A-1 Rubber from valve..to fuel pump. (for vibration protection.) Metalic from pump output to filter (or no filter) and metalic to carb inlet.
The engineering justifcation for this type of install is fire resistance. (metalic on top of the intake manifold)
In case of a small leak and resulting fire the fire will not burn through the fuel line spilling more fuel for the fire.
While this is true.. there is a question how much fuel would pump after the line burnt through? Actually quite a bit it takes at least 30 seconds for an engine at idle to run dry all the while pumping additional fuel onto the fire.
I have had one metalic canister fuel filter leak and I have heard of a couple returned this year due to a mfg. problem with the threads so the flare fitting does not seat. I posted the federal requirements for fuel lines some time back.
Now some of the racing reienforced fuel lines would work great but I do not know if any are USCG approved. They would resist abration very well.
safe boating,
dave
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