The  winter fuel formula in California is causing vapor lock.  This only happens when the winter grade comes out in California.  What would anyone recommend as an additive to decrease the volatility.

We've had some good discussions about the "vapor lock".  The info gathered suggests that the simplest way to cure it is to convert to an aluminum fuel rail.  The larger bore of the rail holds enough fuel to cool the injectors via boiling and condensation, with the heat conducted and radiated away by the aluminum.

 

http://www.classiczcars.com/topic/48810-hot-start-issue-with-efi-who-has-it-who-doesnt/

 

Assuming that you're talking about a 280Z.  The 240Z's with carbs and mechanical pump can have a real vapor lock problem.

Thanks for the reply.  Yes it is a 280Z  77.

Why would they even bother with Winter fuel grades in California? It never gets cold enough there, except maybe in the Sierra's.

 

Edit: Oh never mind...seems your Politicians got involved again:

 

http://www.popularmechanics.com/cars/news/auto-blog/summer-blend-vs-winter-blend-gasoline-whats-the-difference-13747431

Cant leave CA fuel for more than 2 weeks in a small motor without gumming up a carb..