----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]---- In a message dated 9/8/00 10:33:28 PM Eastern Daylight Time, [EMAIL PROTECTED] writes:
> Gravity > fed systems like ours are generally considered more of a liability for > vapor lock. You are just thinking about the intake side of the pump > where it is sucking which might lock but would probably clear itself > soon enough. Best bet would be pumps in the tank outputs to keep it > under pressure all the time. You've got it backwards. A gravity feed system (like a high wing) is ALWAYS under pressure (negative G's excepted). Line pressure raises the Reid vapor pressure necessary to produce a vapor bubble. And any bubbles that are produced are pushed through the needle valve and out the carb bowl vent in short order. Generally, these pass un-noticed. A vapor bubble in the suction side of a pump is extremly difficult to clear because the suction perpetuates the bubble. The pump cannot pump vapor very well, so it locks. This is why some airframes are not STC'd for autogas, even though others with identical powerplants are. > With car gas as high prices as it is now, > I don't know why anybody would bother. I use it because it's better for the engine. No fouled plugs and no stuck valves. Money has nothing to do with it. John __________________________________________________ To unsubscribe from this list please send mailto:[EMAIL PROTECTED] ___________________________________________________________ T O P I C A The Email You Want. http://www.topica.com/t/16 Newsletters, Tips and Discussions on Your Favorite Topics
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