z31sham Posted April 16, 2015 Share Posted April 16, 2015 Recently replaced my fuel system on 70 240z. Started it back up last night after a few months of been idle. Started up a little lackluster but nothing uncommon. After two minutes of rough idle the carbs started to stutter or burble. I'm adding links to the youtube clips I took. I didn't run the engine for much longer just incase. Fuel system: tank - filter - pump - regulator - manifold - carb - carb - carb. Any thoughts? https://youtu.be/holqzub_U8w https://youtu.be/UyFgPYs0-fA Quote Link to comment Share on other sites More sharing options...
T-Bone028 Posted April 16, 2015 Share Posted April 16, 2015 I'm assuming no return? Some people advocate putting the regulator AFTER the carbs. I run my system with a return, and my regulator is after the carbs (3.25 psi). Tank - filter - fuel pump - carb carb carb - regulator - filter - return to tank. Anyways, after watching the video, its kinda hard to determine what/where that noise is...have you taken off the air filters yet? Might make it easier to determine which throat is making the most noise. Any fuel leaking out the horns? When was the last time you checked floats and synch'd the carbs? Quote Link to comment Share on other sites More sharing options...
z31sham Posted April 18, 2015 Author Share Posted April 18, 2015 Found it, left the vacuum line off the brake booster. Sounds like a fuckin' champ now. Thanks for the insight though. Quote Link to comment Share on other sites More sharing options...
gnosez Posted April 18, 2015 Share Posted April 18, 2015 Highly recommend a oz or two of Marvel Mystery oil per gallon. Old school measure to keep the fuel float valve lubricated. 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.