12 · Diagnostics

Diagnosis table

DiagnosisDiagnosis table

When the car is moving, a smell of fuel leading from the rear of the vehicle can be noted, especially after refuelling.

Check preliminarily:
– fuel tank leaks or damage

Step	Validity	Operation to be performed	Test results
Step	Validity	Operation to be performed	OK	⚠	🔧
1	Check fuel breather		All OK	Problems found	Intervention
1	Check correct position of fuel tank breather		Go to Step 2	Incorrect breather position	Restore correct breather position PROCEDURE OP. 1040A50
2	CHECK TANK FUEL FILLER		All OK	Problems found	Intervention
2	Check tank fuel filler in particular: – fuel filler sealant on mudguard – intactness of fuel filler – cap seal		Go to Step 3	Faulty fuel filler or cap	Restore fuel filler PROCEDURE OP. 1040A30 Restore cap PROCEDURE OP. 1040A40
3	Check pump cover		All OK	Problems found	Intervention
3	Check tightness of pump cover/fuel doser seal		Go to Step 4	Worn seal, damaged cover	Replace seal or replace cover PROCEDURE OP. 1040A70
4	CHECK FUEL FUME RE-CIRCULATION SYSTEM		All OK	Problems found	Intervention
4	Check fuel fume re-circulation tightness PROCEDURE 1080E		Go to Step 5	Fuel fume re-circulation system leaks	Tighten fittings and clips. If required, replace parts PROCEDURE 1080E
5	Check underbody		All OK	Problems found	Intervention
5	Check present of caps in underbody		Go to Step 6	No underbody caps	Restore missing caps
6	CHECK CORRECT OPERATION		All OK	Problems found	Intervention
6	Check the fault is no longer present		End of test	–	–

Parts & tools for this job For 1998 Fiat Seicento

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