- Jun 18, 2008
- Reaction score
- San Antonio Texas
All carburetor problems ARE NOT ignition
« on: August 26, 2019, 11:11:55 AM »
You know sometimes it’s real easy to overthink things. My motor (511 inch, roller cam, CNC heads, 10.2:1 compression) continued to run fantastic as long as it was moving at speed but once i slowed down it would cut out and stay “dead” for a while before I could start it again. It would cut out abruptly, so it MUST be ignition, right? Well I have gone through no fewer than 5 ignition systems ending up with an MSD. a-6. Same results.
Finally had eyeballs on my AFR meter when it cut out again and guess what? Not ignition, boiling fuel and vapor lock. Finally realized that running the 1/2 inch fuel line up the inside of the fender well about 5 inches from the headers and no thermal insulation under the carb might not be the best way to go, especially with 96+ degree days.
Not that I tend to overkill things but when I get back home (I’m cooling off in the Blue Ridge Mountains for a while) I’m going to re route the fuel line to a bypass regulator away from the aheaders and run a return line back to the tank. If that doesn’t do it, look for a 73 coupe de Ville in the for sale section.