As far as the brake system and fuel rubber hoses are concerned, carefully follow the “Service schedule” in this section.
Indeed ozone, high temperatures and prolonged lack of fluid in the system may cause hardening and cracking of the hoses, with possible leaks. Careful control is therefore necessary.
See also:
Fuel System Cautions
CAUTION!
Follow these guidelines to maintain your vehicle’s performance:
• The use of leaded gas is prohibited by Federal law.
Using leaded gasoline can impair engine performance and damage the ...
Fiat Doblo Owner's Manual
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Transmission
Modifications or repairs to the fuel system that are not carried out properly
or do not take the system’s technical specifications into account can cause malfunctions
leading to the risk of fire ...