Thread: Engine Swap - '92 5.0EFI/AOD into '66 Ford F100....

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Arrrrrgh! I had a bunch of stuff typed and lost it!!

Just thinking out loud here, which is dangerous but that little valve looks like a two-way that opens with vacuum. What if you ran your tank vent into the canister, then your canister outlet to the bottom black and tee the top black into your PCV line, and the orange to manifold vacuum. Tank vents to canister, engine starts and sucks the canister fumes into the engine? Problem is, it keeps sucking as long as the engine runs.
Soooo, if we could find a three way valve or two, ports 1&2 connected, 3 blocked, and then with vacuum 1 blocked, 2&3 connected? Now you put one in the line from the tank to the canister, tank to 1, canister to 2, 3 to atmosphere, orange to vacuum. Now when the engine starts, we suck the canister out using atmospheric air, but UH-OH, the tank's blocked and will implode (engine will die).
Soooo, we take a the second three way valve, put it upstream of the first one in that tank vent, put the line to the canister (the line running to the first valve) to port 1, tank to 2, and atmosphere to 3. Now the vent runs through the first valve, port 2 to 1 when off, into the second valve; and through the second valve port 1 to 2, collecting fumes in the canister. When the engine starts the first valve switches the tank to an atmospheric vent, which is OK because it's under negative pressure now, and opens the canister inlet to atmosphere, which is OK because it's also being sucked down by engine vacuum. The only missing piece might be an orifice in that line going to the PCV to limit flow and keep your engine vacuum where it needs to be because I've just created a big vacuum leak!!
This is either right or terribly wrong, but I predict you'll have to read it more than once to decide.....