Carburetor Tuning with a Vacuum Gauge | Edelbrock Carb Tuning | Dodge D100

Published 2022-01-10
The 1975 Dodge D100 project hot rod truck has run rich ever since I got the truck. Today I will be using a vacuum gauge to see if I can't dial in the air-fuel mixture on the Carter/Edelbrock carb...wish me luck!

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All Comments (11)
  • @einstein3509
    Did you put lighter springs in, on the needles. If they are the stock carb spring they may be to strong for the vacuum you have. That will make it run rich. I say this because of my experience with my Edelbrock. My vacuum is around 14 and when I slid the needle caps to the side while the engine was running they were bouncing up and down. Made my engine sound like I had a bigger cam. There wasn’t enough vacuum to over come those springs. So I bought the spring kit from Edelbrock and kept installing lighter spring until the needles stayed down at idle. Then it ran leaner and smoother. The trick it to install the strongest spring that your vacuum can hold down. So the second your engine starts to loose vacuum from pushing on the throttle those needles will spring up letting gas in.
  • Power tune timing first! Advance until it pinks up hill in high gear and back off one nudge so it stops pinking. Then start on the carb.
  • Edelbrock recommends 6psi to maybe 6.5 so you're right on.
  • @josecuevas8602
    The fuel level affects the entire fuel curve, high fuel level enrich the fuel curve, low fuel level dose the opposite, leans the fuel curve.
  • Has anyone tried deleting the float and maintaing the fuel pressure to the disired level