Diagnosing faults in diesel fuel system
- Make
- Fiat
- Model
- Punto (176) Factory Service Manual
- Year
- 1993–1999
- Section
- Fuel system (1698 D) › Diagnosing faults in diesel fuel system
10 EngineDiagnosing faults in diesel fuel system · page 1 of 4
DIAGNOSING FAULTS IN DIESEL FUEL SYSTEM
This fault diagnosis table is applicable only if the engine is efficient and the electrical equipment has been properly checked.
| ANOMALY | CAUSE | REMEDY |
|---|---|---|
| When warm, the engine will not start or starts with difficulty | Tank empty, ventilate blocked tank | Fill tank, check tank ventilation |
| Water in fuel | Drain water from filter, clean filter and bleed air | |
| Air in fuel system | Bleed air and eliminate system air leaks | |
| Injection order does not correspond to combustion order | Fit pipes from pump to injectors in correct order | |
| Engine arrest solenoid short-circuited | Check electrical leads and/or replace solenoid | |
| Fittings loose, leaks from lines, pipes broken | Tighten fittings and eliminate leaks | |
| Injectors defective or excessively dirty | Clean injectors, check and/or replace | |
| Incorrect injection pump timing | Reset injection pump timing and adjust advance | |
| Incorrect injection pump setting | Check injection pump setting at test bench | |
| When cold, engine does not start or starts with difficulty | Tank empty, ventilate blocked tank | Fill tank, check tank ventilation |
| Water in fuel | Drain water from filter, clean and bleed | |
| Air in fuel system | Bleed air and eliminate leaks in system | |
| Heavy paraffin build-up in fuel filter | Change filter and use winter-type fuel | |
| Injection order does not correspond to combustion order | Fit injection pipes from pump to injector in the correct order | |
| Engine arrest solenoid short-circuited | Check electrical leads and/or replace solenoid | |
| Fittings loose, leaks from pipes, pipes broken | Tighten fittings and eliminate leaks | |
| Pre-heating circuit defective | Check glow plugs and ECU | |
| Injectors defective or excessively dirty | Clean injectors, check and/or replace | |
| Incorrect injection pump timing | Restore correct injection pump timing and adjust advance | |
| Incorrect injection pump setting | Check injection pump timing at bench |
Parts & tools for this job For 1993 Fiat Punto
- PARTGlow plugsSearch: Fiat Punto 1993 glow plugs
- TOOLGlow plug socketSearch: glow plug socket
- TOOLDiesel compression testerSearch: diesel compression tester
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