AlwaysBroke Posted September 20, 2008 Share Posted September 20, 2008 A little while ago I was fighting with trying to tune my carb. when I noticed that the vacuum advance did not hold air, causing a vacuum leak and no advance. I thought that that was kind of weird (its only a couple of years old) but I went ahead and replaced it. Now its a week later and the same thing happened! What would cause the diaphragm to keep ripping? The setup I have is a 4.3L V6 (practically the same thing as a small block Chevy) It has a Demon 525cfm carb. and a Mallory Uni-lite distributor. I checked to make sure that the vacuum was connected to the correct port and it was. However, the line (just some clear plastic tubing that I had lying around at the time of the build) was blackened and hard on the end that is connected to the carb. I'm not sure if that is a sign of anything. Quote Link to comment Share on other sites More sharing options...
AlwaysBroke Posted September 24, 2008 Author Share Posted September 24, 2008 Anyone? I was going to get a vacuum gauge today and see how much it was pulling, but... Now Im dumping fuel out both my secondary boosters. Could these be related? At least Im living up to my name Quote Link to comment Share on other sites More sharing options...
jnjdragracing Posted September 24, 2008 Share Posted September 24, 2008 Yes it can, if the vacuum hose turned black which was clear before and it is hard then you are getting gasoline in the line which is probably causing your vacuum advance to go bad. I would pull both float bowls of and the needle seats out and clean good. Sounds like some trash in the carb getting caught in the needle seat keeping it open and flooding out your carb. John Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.