Trouble Shooter
|
FAULT | CAUSE | CURE |
Flooding | 1. Improper seating or damaged float needle | 1. Check and replace parts valve or seat as necessary. |
| 2. Incorrect float level | 2. Adjust float level. |
| 3. Fuel pump has excessive pressure | 3. Check fuel pump. |
Excessive fuel consumption | 1. Engine out of tune | 1. Tune engine. |
| 2. Float level too high | 2. Adjust float level. |
| 3. Loose plug or jet | 3. Tighten plug or jet. |
| 4. Defective gasket | 4. Replace gaskets. |
| 5. Fuel leaks at pipes or connections | 5. Trace leak and rectify. |
| 6. Choke valve operates improperly | 6. Check choke valve. |
| 7. Obstructed air bleed | 7. Check and clear. |
Stalling | 1. Main jet obstructed | 1. Clean main jet. |
| 2. Incorrect throttle opening | 2. Adjust throttle. |
| 3. Slow-running adjustment incorrect | 3. Adjust slow-running. |
| 4. Slow-running fuel jet blocked | 4. Clean jet. |
| 5. Incorrect float level | 5. Adjust float level. |
Poor acceleration | 1. Defective accelerator pump (if fitted) | 1. Overhaul pump. |
| 2. Float level too low | 2. Adjust float level. |
| 3. Incorrect throttle opening | 3. Adjust throttle. |
| 4. Defective accelerator linkage | 4. Adjust accelerator linkage. |
| 5. Blocked pump jet | 5. Clean pump jet. |
Spitting | 1. Lean mixture | 1. Clean and adjust carburettor. |
| 2. Dirty carburettor | 2. Clean carburettor. |
| 3. Clogged fuel pipes | 3. Clean or replace pipes. |
| 4. Manifold draws secondary air | 4. Tighten or replace gasket. |
Insufficient fuel supply | 1. Clogged carburettor | 1. Dismantle and clean carburettor. |
| 2. Clogged fuel pipe | 2. Clean fuel pipe. |
| 3. Dirty fuel | 3. Clean fuel tank. |
| 4. Air in fuel system | 4. Check connections and tighten. |
| 5. Defective fuel pump | 5. Repair or replace fuel pump. |
| 6. Clogged fuel filter | 6. Clean or replace filter. |
Loss of fuel delivery | 1. Pump faulty (electric) | 1. Replace pump. |
| 2. Slotted body screws loose | 2. Tighten body screws. |
| 3. Diaphragm cracked | 3. Overhaul fuel pump. |
| 4. Loose fuel pipe connections | 4. Tighten fuel pipe connections. |
| 5. Defective valves | 5. Replace valves |
| 6. Cracked fuel pipes | 6. Replace fuel pipes. |
Noisy pump | 1. Loose pump mounting | 1. Tighten mounting bolts. |
| 2. Worn or defective rocker arm (if manual) | 2. Replace rocker arm. |
| 3. Broken rocker arm spring (if manual) | 3. Replace spring. |