Do you know how full a fuel filter should look during idle, 1900 RPM cruise or full throttle? I recorded the vid linked below showing both fuel filter (on left half of screen) and fuel bowl (sight glass) levels. I sent the vid starting at 8:50 when vehicle's warmed up & we go WOT to show what's going on. (If you want to see the fuel levels when the car was cold, that's at the 0:00 start of the clip.)
The car runs great in cruise & WOT, but when it was warmer May 4, I noticed the air/fuel ratio at idle would creep from 15:1 to mid 17s when idling or off-throttle decel. Which is why I've started looking into potential vapor lock since the car will also drain the bowls if parked for a week after being parked when warm.
Figured I should ask around if this behavior is normal for a '69 Camaro with the Carter high-flow mechanical pump, Demon 750 carb, and a new fuel tank & hard lines installed in 2004 (stored with Sta-bil anytime it was parked over a week).
If it's not normal, I'll drain & drop the tank to look into whether the sock might be clogging, or whether there's a safe way to install another vent to reduce pressure. Removing the gas cap will add more fuel to the filter - I've tried a new vented and a vented locking cap w/same results.
Last resort might be adding an electric fuel pump in-tank and maybe a bigger (1/2") line toward the engine & use the stock 3/8" line as a return... but I'm no fan of adding complexity, running wires & relays if we don't have to, as I'd like to stay carbureted since this thing handles autocross & street driving so well (12.5:1 air fuel when WOT, 14.8-15:1 in cruise & idle).