Several new design components may be needed to complete fuel system-related repairs on some 2019-2020 Cadillac CT6 models equipped with the 4.2L twin-turbo V8 engine (RPO LTA). (Fig. 15) The 2nd design components include the fuel feed pipe, fuel rail assembly, oil cooler pipe and engine front cover.
Fig. 15
A dimensional change to the fuel feed pipe and fuel rail assembly was made during the 2019 model year, which prompted the release of the 2nd design fuel feed pipe, fuel rail assembly, oil cooler pipe and engine front cover.
The 2nd design fuel feed pipe and fuel rail assembly will not service an engine that was originally equipped with the 1st design fuel feed pipe, fuel rail assembly or engine front cover.
To retrofit the engine to accommodate any of the 2nd design parts, it’s necessary to replace the fuel rail assembly, fuel feed pipe and engine oil cooler pipe to completely update the engine to the latest service content.
There were also two designs of the engine front cover in production — one with the fuel pipe channel (Fig. 16) and one without. Before ordering parts, determine which front cover is needed. If the engine has the 1st design front cover with the fuel pipe channel, order a new engine front cover to complete the repair. If the front cover does not have the fuel pipe channel, do not replace the engine front cover.
Fig. 16
For additional information and part numbers, refer to Bulletin #22-NA-072.
– Thanks to Bryan Salisbury
