Section 8 - Fuel System; Fuel System Troubleshooting - Gravely 985103 Service Manual

8.1 FUEL SYSTEM TROUBLESHOOTING

The following troubleshooting chart is to be used to
isolate fuel system problems and give possible causes
are corrective action responses
TROUBLE
Hard Starting
Fuel Leak at Carburetor
Engine Floods
Will not idle
Rich idle
Idles with Needle Closed
Hunts Erratic Idle
Idles Fast Lean
Will Not Accelerate
Over Rich Acceleration
Hesitates
Will Not Run at High Speed
Low Power
Hunts at High Speed
Runs With Needle Closed
Engine Overspeeds
1 Plugged Air Filter
2 Leaky Carburetor Gasket
3 Throttle or Choke Shaft Worn
4 Choke Not Functioning
Properly
5 Plugged Atmospheric Vent
6 Air Bleed Restricted
7 Damaged or Leaky "O" Rings
8 Damaged Diaphragm
9 Stuck or Dirty Ball Check
10 Diaphragm Upside Down
11 Plugged Tank or Vent
12 Fuel Pick-up Restricted
13 Idler Port Restricted
14 Damaged Adjustment Needle
and Seat
15 Incorrect Float Height
16 Main Nozzle Restricted
17 Dirty, Stuck Needle and Seat
18 Fuel Inlet Plugged

SECTION 8 - FUEL SYSTEM

POSSIBLE CAUSES
(Refer to Key Below)
1, 3, 4, 6, 11, 12, 14, 16, 17, 18
5, 7, 17
5, 15, 17
1, 2, 3, 6
1, 6, 14
14
2, 3, 6, 7, 12, 13, 14, 15, 18
2, 3, 7
1, 6, 11, 12, 14, 15, 16
1, 15
2, 6, 11, 12, 16
1, 11, 12, 14, 16
1, 3, 11, 14, 15, 16, 17, 18
3, 6, 7, 12, 14, 15, 16, 18
14
2, 3, 7, 14
TROUBLESHOOTING KEY
8 -29
The troubleshooting key is generic and can be used for
several types of transmissions. Use only those
possible causes and corrective actions that apply to the
unit.
CORRECTIVE ACTION
clean, repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace
repair or replace