Retrospective requirements for jacketed high pressure fuel lines on existing ships (1994 Amendments to SOLAS 1974) apply to ships constructed before 1 July 1998. In addition, SOLAS II-2/15.2.9 requirements shall be complied with not later than 1 July 2003. The requirements state that all external high pressure fuel delivery lines between the high pressure fuel pump and fuel injectors shall be protected with a jacketed piping system capable of containing fuel in case of a high pressure line failure. The jacketed piping system shall include a means for collection of leakages and arrangements shall be provided for an alarm to be given in case of a fuel line failure.
For engines having an output of 375 kW or less and having fuel injection pumps serving more than on injector, a suitable enclosure instead of jacketed piping system may be used. In this case, the enclosure shall be made of metal and be capable of avoiding oil spray or oil leakages onto hot surfaces, into machinery intakes or other sources of ignition. If the engine has an enclosure entirely covering high pressure fuel pump and high pressure fuel pipe, the above requirements do not apply. It is considered that such cover is sufficient to prevent oil spray or oil leakages from reaching sources of ignition. It is also considered that the high pressure fuel pipes are not external high pressure fuel delivery lines.