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TROUBLE |
POSSIBLE CAUSE |
SYSTEM |
Acceleration Complaints |
Damaged or obstructed pump inlet check |
Accelerating Pump Sys |
valve. Distorted, worn or damaged pump |
tem | |
piston leather. Damaged or obstructed pump |
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discharge needle or seat. Damaged or ob |
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structedpump discharge nozzles or passages. |
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Incorrectly set accelerating pump link. |
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Idle or Low Speed Com- |
Damaged, obstructed, or loose idle tubes. |
Idle System |
plaints |
Damaged or obstructed idle air bleeds. |
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Grooved or damaged idle adjusting needles. |
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Damaged or obstructed idle discharge and |
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transfer holes. Carbon deposits in the pri |
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mary throttle bores. |
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Incorrectly set or damaged floats. |
Fuel System | |
Incorrectly set, damaged, or faulty dashpot. |
Dashpot | |
Too Lean Operation |
Damaged or obstructed main well tubes. |
Main Metering System |
Damaged or obstructed air bleeds. |
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Damaged, distorted, or undersized main jets. |
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Damaged, obstructed, or loose idle tubes. |
Idle System | |
Damaged or obstructed idle air bleeds. |
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Incorrectly set secondary throttle plates. |
Secondary Throttle Sys | |
Damaged throttle operating diaphragm. |
tem | |
Low fuel level in float chamber because of |
Fuel System | |
improperly set or damaged floats, damaged |
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or obstructed inlet needle valve, or insuffi |
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cient fuel pump pressure. ' |
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Hard Starting or Stalling |
Clogged or obstructed vent holes in pump |
Accelerating PumpSys |
operating rod. Clogged or undersized vent |
tem | |
holes in pump piston chamber wall. |
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Damaged or distorted secondary jet gasket. |
Secondary Throttle Sys | |
Loose secondary jet head nut. |
tem. | |
High Speed Complaints |
Clogged or obstructed ball check valve in |
Secondary ThrottleSys |
Carry-Over (Speed not |
secondary vacuum passage. |
tem. |
reduced simultaneously |
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with the closing of the |
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throttle) |
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