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Originally Posted by HPsauce
That's not logical, captain...…
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Or more likely it is and it's me that's confused. 
So I've just been reading up on the general principles around the canister, something I knew nothing about before....
They collect vapour given off by the fuel that might otherwise be vented to the atmosphere at any time, typically through temperature changes while parked.
So they are in line to a pressure release valve and vent de-vapoured air, in this case presumably via the pipe noted as 5 on the earlier diagram. I'd guess the pressure valve is incorporated into the cylinder unit somehow.
When the engine is running and reaches certain conditions another valve opens and air is sucked in through the canister (presumably also via pipe 5) to purge the vapour from the carbon into the engine air intake.
I struggle to see how any of that could cause an airlock blocking 2 gallons of fuel entering the tank.
Though I'm still not clear about pipe 9 and the vent into the filler tube. Most vapour will be coming up pipe 9 so that needs to vent when under pressure via the canister. I guess when the filler cap is open it just passes by the canister and into the filler tube; when not fuelling that will be sealed to the outside so it can somehow route back to the canister.
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This contains the gravity valve
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what does this do?
I'm wondering if you dare connect an air line (if physically possible) to the vent into the filler tube and blow back down it?
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2003 D2 FL S8. Irish Green Pearl/Beige. Solar sunroof, auto-dim mirrors, electric rear seat functions, ski hatch retrofit; extended leather. Aftermarket DVB-T, reversing camera and full XCarlink (Bluetooth etc.).
2016 Volvo V40 T5 Cross Country (4WD) with ALL the toys including adaptive cruise etc. etc. Osmium Grey with Blonde/Charcoal leather interior. Polestar performance "optimisation".  (A much rarer model than a D2 S8 by the way!) Oh, and a brand new engine at just under 30,000 miles on the factory one! 
Finally: gone, but not forgotten.....
1998 D2 PF S8. AgateGrey/Platinum. Every option (I think) except electric rear seats, tiptronic steering wheel, ski hatch, towbar & dimming door mirrors.
e.g. Cruise control, NavPlus/TV, Bose, GSM, Xenons, Solar roof, Parking sensors, Alcantara/leather everywhere of course.  (internal dimming mirror added later)
1998 (very early) Ford Focus 1.8 Zetec; ABS/TCS, Heated screen/mirrors, Aircon, Auto-dim mirror, Leather, Trip computer, Cruise control, OEM Ford SatNav with CD changer.
And before that a lot of Rover 800s, a few oddities, a lovely Triumph Dolomite 1850HL with Overdrive and way back in my schooldays an Austin Seven aka Mini 850!
Last edited by HPsauce; 13th November 2020 at 12:44 PM.
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