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TROUBLESHOOTING

SCG Classic Car Troubleshooting Checklist - Carburetor Problems

Excessive Fuel Consumption

  • Float level is too high or float is leaking internally
  • Float valve is worn or dirty and won't seat properly
  • Metering rods worn or jet openings worn
  • Power jet not shutting off
  • Idle mixture adjustments too rich
  • Throttle shaft worn and leaking vacuum
  • Accelerator pump stroke too long
  • Choke stuck partially closed
  • Fuel pump pressure too high
  • Air cleaner dirty and clogged

Surging (Lean Mixture)

  • Air leak in manifold or under carburetor
  • Float bowl atmospheric vent clogged
  • Float level too low
  • Air bleeds clogged
  • Incorrect main jet or metering rod
  • Clogged jets
  • Throttle shaft worn
  • Fuel pump pressure too low
  • Heat riser manifold leaking
  • Vacuum leak

Poor Acceleration

  • Accelerator pump faulty or linkage settings wrong
  • Leaking check valve in pump circuit
  • Float level too low
  • Jets running too lean
  • Vacuum leaks
  • Throttle not opening fully (linkage)
  • Choke valve stuck partially closed

Poor Idle

  • Air leaking into manifold
  • Mixture screws incorrectly adjusted or malformed at tips
  • Float level too high
  • Throttle shaft worn
  • Dirty internal carburetor components (high mileage)
  • Choke fast-idle linkage incorrectly adjusted

Stalling

  • Dashpot improperly adjusted
  • Air bleeds clogged
  • Idle passages clogged (if screws have no effect, passages are clogged)
  • Vacuum leak
  • Idle speed too low
 
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