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05-18-2019 #1Registered User
- Join Date
- May 2008
- Posts
- 20
Fuel filter not full - potential vapor lock?
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.)
https://youtu.be/Bz2W80TD-cA?t=530
The car runs great in cruise & WOT, but when it was over 85F outside recently, 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 you if this behavior is normal for a car 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 - not a fan of adding complexity, running wires & relays if we don't have to, as I'd like to stay carbureted.
https://www.youtube.com/watch?v=5_73rDt7z1k
Thanks in advance for ideas & wisdom you can offer.