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

discharge needle or seat. Damaged or ob

structedpump discharge nozzles or passages.

Incorrectly set accelerating pump link.

Idle or Low Speed Com-

Damaged, obstructed, or loose idle tubes.

Idle System

plaints

Damaged or obstructed idle air bleeds.

Grooved or damaged idle adjusting needles.

Damaged or obstructed idle discharge and

transfer holes. Carbon deposits in the pri

mary throttle bores.

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.

Damaged, distorted, or undersized main jets.

Damaged, obstructed, or loose idle tubes.

Idle System

Damaged or obstructed idle air bleeds.

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

or obstructed inlet needle valve, or insuffi

cient fuel pump pressure. '

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.

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

with the closing of the

throttle)