Gravely 990014, Service Manual

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10 - 35
10.1 FUEL SYSTEM TROUBLESHOOTING
The following troubleshooting chart is to be used to
isolate fuel system problems and give possible causes
are corrective action responses
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.
10.2 FUEL TANK REMOVAL
1. Clean and disconnect the fuel line at the fuel tank
fitting.
2. Remove the right side tank rod and loosen the left.
NOTE: It may be necessary to loosen one of the tank
brackets in order to slide the tank out.
3. Slide the tank out.
4. Pull the tank fitting and pick-up tube, up and out.
Pop out the rubber bushing.
5. Move the fuel cap up and down to see if the float
works properly.
6. Inspect and replace any worn or damaged parts.
10.3 FUEL TANK INSTALLATION
1. Reassemble in reverse order. Be careful not to
damage the rubber bushing when installing it.
NOTE: It is recommended to change the fuel filter
whenever work is performed on the fuel system.
SECTION 10 - FUEL SYSTEM
TROUBLE POSSIBLE CAUSES
(Refer to Key Below)
CORRECTIVE ACTION
Hard Starting 1, 3, 4, 6, 11, 12, 14, 16, 17, 18 clean, repair or replace
Fuel Leak at Carburetor 5, 7, 17 repair or replace
Engine Floods 5, 15, 17 repair or replace
Will not idle 1, 2, 3, 6 repair or replace
Rich idle 1, 6, 14 repair or replace
idles with Needle Closed 14 repair or replace
Hunts Erratic Idle 2, 3, 6, 7, 12, 13, 14, 15, 18 repair or replace
Idles Fast Lean 2, 3, 7 repair or replace
Will Not Accelerate 1, 6, 11, 12, 14, 15, 16 repair or replace
Over Rich Acceleration 1, 15 repair or replace
Hesitates 2, 6, 11, 12, 16 repair or replace
Will Not Run at High Speed 1, 11, 12, 14, 16 repair or replace
Low Power 1, 3, 11, 14, 15, 16, 17, 18 repair or replace
Hunts at High Speed 3, 6, 7, 12, 14, 15, 16, 18 repair or replace
Runs With Needle Closed 14 repair or replace
Engine Overspeeds 2, 3, 7, 14 repair or replace
TROUBLESHOOTING KEY
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
WARNING: If the fuel tank has a leak, replace
it. Do not try and repair it.