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
data-matched-content-ui-type="image_card_stacked"
data-matched-content-rows-num="3"
data-matched-content-columns-num="1"
data-ad-format="autorelaxed">