| Possible
Solution |
Carburetor
doesn't adjust properly |
Carburetor
floods |
Fuel
leaks at shaft |
Internal
fuel leak |
Misses
or surges |
Stumbles
or loads up |
Engine
won't idle |
Rough
idle |
Backfires |
Bogs |
Hard
starting |
Lack of
power |
Pinging
at moderate cruise just off idle |
Engine
stalls on hard braking |
Low fuel
economy
|
| Check
for air leaks. Make sure carburetor and manifold gaskets
seal properly. All outlets must be plugged or connected.
| X |
|
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|
X |
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X |
X |
X |
X |
|
X |
X |
|
X |
| Check
ignition system. Replace parts as necessary. Adjust timing
to proper specifications.
| X |
|
|
|
X |
|
X |
X |
X |
|
X |
|
X |
|
X |
| Check
choke adjustment.
|
|
|
|
|
X |
X |
X |
X |
X |
|
|
X |
|
|
X |
| Change
carburetor fuel filter and/or in-line fuel filter.
|
|
X |
|
|
|
X |
|
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|
X |
X |
X |
|
|
| Too
lean. See Tuning Procedure.
|
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|
X |
|
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|
X |
|
X |
X |
|
|
| Check
float level and drop.
|
|
X |
X |
|
|
X |
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|
X |
X |
| Check
idle mixture screw adjustment.
| X |
|
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|
X |
X |
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|
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|
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|
X |
| Too
rich. See Tuning Procedure.
|
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|
X |
|
|
|
X |
|
|
|
|
X |
| Increase
accelerator pump stroke. Pump squirter size change may be
needed.
|
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|
X |
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|
X |
|
|
|
| Off-road
vehicle may need spring-loaded needle and seat kit.
|
|
X |
X |
|
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|
| Check
for dirt or metal in needles and seats. Needles and seats
may need replacement. See below.
|
|
X |
|
X |
|
|
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|
|
|
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|
|
|
X |
| Check
for dirt blocking the low speed circuit. Clean unit and
apply air pressure. Install in-line fuel filter #8873.
| X |
|
|
|
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|
X |
|
|
|
|
|
X |
|
X |
| Check
floats for leakage. Replace if necessary.
|
|
X |
|
X |
|
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|
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|
X |
X |
| Check
air horn gasket. Replace if deterioration or breakage is
present.
|
|
X |
|
X |
|
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|
|
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|
|
|
|
X |
X |
| Fuel
is boiling due to excessive under hood temperature. See
below.
|
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|
X |
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|
X |
|
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|
X |
| Fuel
pressure too high. Fuel regulator may be needed.
|
|
X |
|
X |
|
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|
|
|
X |
X |
| Fuel
pressure too low. Check fuel system.
|
|
|
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|
X |
|
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|
X |
|
|
|
| Check
secondary latching device and rod for proper movement.
|
|
|
|
|
|
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|
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|
|
|
X |
|
|
|
| Lower
float level from 11/32" to 7/16".
|
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|
X |
|
Dirt/metal shavings between the needle and seat or a
"sticking float": To correct either of these
problems, lightly tap the carburetor fuel inlet area with the
handle of a screwdriver. If flooding continues, pinch the fuel
line (if possible). Start the engine and let it run until it
stops. Release line and restart engine. If flooding persists
examine the needles, seats, float level, and float drop. Adjust or
replace parts if necessary.
Excessive under hood temperature: Ensure fuel line is
not located too close to heat sources such as the exhaust or
block, causing expanding fuel to be forced past the needle and
seat. Fuel can also boil inside the carburetor due to missing
gaskets, spacers, or heat shields. Also check to see if the
exhaust heat riser is stuck, allowing excessive heat under the
carburetor. Use Edelbrock Divided Heat Insulator Gasket #9266 for
dual-plane manifolds, Square-Bore Heat Insulator Gasket #9265 for
single-plane manifolds, and #9267 Heat Insulator Gaskets for
dual-quad manifolds.
Excessive fuel pump pressure:
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