Weird pipe in the trunk
Hi Dan,
So where you mention connecting the purge / fuel tank vapor line into a T to the PCV line, would that cause an issue if the car backfired thru the carb?
Would the flame travel thru the manifold vacuum line to the tank, or does the purge valve prevent this because when the intake manifold goes positive pressure it forces the purge valve to close?
Or does a flame not travel thru a small tube?
Or does the positive pressure from a backfire in the dist advance vac line force the purge valve closed?
Thanks I really have to know in the next .02 seconds.
. :glasses7:
Hi Dan,
So where you mention connecting the purge / fuel tank vapor line into a T to the PCV line, would that cause an issue if the car backfired thru the carb?
Would the flame travel thru the manifold vacuum line to the tank, or does the purge valve prevent this because when the intake manifold goes positive pressure it forces the purge valve to close?
Or does a flame not travel thru a small tube?
Or does the positive pressure from a backfire in the dist advance vac line force the purge valve closed?
Thanks I really have to know in the next .02 seconds.
. :glasses7:
A charcoal can is easy to adapt to non-spec applications. Original types have three ports: TANK (tank vent), CARB or BOWL (carb bowl vent), and PURGE. If you find a replacement with only one vent port ("tank", these are common on fuel injected cars that don't have a bowl vent) you can simply tee the carb bowl vent line into the tank vent line near the canister, then connect this composite vent line to the one and only vent port on the canister. Size does matter here; the late model units tend to be smaller because there's less vapour to handle (no hot carb pouring off vapours).
There needs to be a canister purge valve that only opens when the engine is above idle. Some canisters have these built in (looks like a round "flying saucer" atop the canister itself), but many do not, including Mopars after '72 and most late-model ones in which purging is controlled by the computer via a solenoid. Fortunately, standalone purge valves are readily available and inexpensive. NAPA Echlin # 2-28011:
Small fitting gets teed into the vacuum advance hose (which should have no vacuum at idle, full vacuum above idle)
Big fittings go inline with "PURGE" hose from canister, which gets teed into the PCV hose.
Whew! It's Miller time. :lol:
