Quote:
Originally Posted by fordgarage
I don't understand really.
How are you able to tell where the vapor bubble is leaving the sediment bowl? How can tell it is going up or down?
And if it did go down, it would go past the float valve, and into the float chamber, which is vented to the atmosphere.
So how would that affect the engine operation?
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There's two ways in or out of the sediment bowl. The inlet in the center top is clearly visible from the outside and in my photos; the outlet is not visible. I could watch the vapor bubble disappear and it clearly did not go back up the center inlet, so I assume it went out the outlet to the carb.
As I stated earlier, when the vapor bubble passed, it barely caused the running motor to hiccup. The photos were presented as an example of vaporization, bubble formation, and bubble flow--not as an example of vapor lock, per se. My claim is that under actual vapor lock conditions--hot day, following a long pull, perhaps sitting a bit after turning off hot motor--it's not hard to imagine the harmless vaporization seen in the photos getting out of hand and causing a problem. I understand that the carb bowl is vented, but doesn't it make sense that in the limit of too much vapor and correspondingly too little liquid fuel coming down the fuel line, perhaps supplemented with vapor forming in the carb bowl itself, and perhaps further aggravated by "sticky" bubbles somewhere along the line, you could be in trouble?
My problems showed up as needing to rev the engine as I pulled up to and sat at a stop light after a long pull; otherwise, the car would run very rough and die. Idling in the driveway was always fine, once things calmed down.
Steve