Fuel Pump Drain Hose Size?

6mm ID😈

Or 1/4"

Thanks, gents!

Hi Roger, I recall seeing one of your posts that suggests a routing for the engine-driven fuel pump drain hose, but I can't find it.  I think you said route it over the #1 and #3 cylinders to the firewall and then down?  I have some high-temperature rubber hose (see attached specs) that I was planning to use for this drain.  Questions: The hose is rated at 338°F.  Should I place this inside fire sleeve?  If the hose is routed below the #1 and #3 cylinders, t looks to be a challenge to attach the hose so that it does not vibrate/chafe.  Suggestions?  Thanks Roger.   

I have run my fuel pump drain hose below the cylinders and elected to terminate the end in a home made catch can, secured near the bottom of the firewall. The catch can is open to ambient pressure.

I have only protected the hose from heat, where it passes close to the exhaust system.

Catch Can reasoning is simple: I want to see any fuel leaking from the pump, as this may indicate an imminent failure. The catch can is checked at each pre-flight inspection (175 hrs no fuel, very very small amount of crankcase oil).

😈