Hi my 1MZ-Fe 3.0 v6 has had a fuel issue of late, it seems the system isnt holding residual pressure. After you drive the car switch off then try to star about 10 mins later will spin over 10 revs at least to build up the pressure and then starts, It now has bettered itself and is ok but being a tech myself im sure its giving me a warning, any ideas????
Cheers in advance

 

The fuel is leaking out somewhere. Places to check are a leaking injector(s), pressure regulator and fuel pump. For US cars the regulator is in the fuel tank as part of the fuel filter assy.