Fuel Vaporization Using Eddy Carb -- In-Line Fuel Pump Question

Are you 100% sure the carburetor is having vaporization (vapor lock) issues? Real vapor lock is actually pretty rare. People who think they are experiencing it, are usually having another issue.

I have an Edelbrock 625 on my 75 F250. Stone stock 351M other than a Weiand Action Plus intake. When hot, mine has to spin the engine a bit. I also run the thick insulator gasket. I don't buy the Holley comparison. The fuel bowls are hanging over the intake in either carburetor. I have seen Eddys that pop right off hot. As fantastic as mine runs, I don't give a darn if it takes an extra few seconds to start. Oh and before someone says I don't have enough initial timing, I have it at 20 initial and 35 total, in by 3K. lol I think it's in the carburetor tuning, but I am too lazy to change mine, since it runs so well everywhere else.

I ask if you are sure, because holding the throttle open helps mine. That tells me the idle mixture is a little rich. Have you tried different springs on your metering rods? Have you tried tuning it at all? Usually if you can influence it by holding the throttle open it is too rich. A hot engine doesn't like a rich mixture at startup. Does holding the throttle open help yours?

As good as mine runs, spinning the engine over is nothing to put up with. This thing is also knocking down some high teens in gas mileage. That's a hell of a feat with a 4 speed and 3.73 gears in a truck that has an 8100 pound GVWR rating. As Daddy used to say, "If it ain't broke, don't fix it." LOL