Suzuki Engine 2002 GRAND VITARA SQ420 Service Manual page 726

ENGINE AND EMISSION CONTROL SYSTEM (H25 ENGINE) 6E2-33
INSTALLATION
1) Replace injector O-ring (1) with new one using care not to
damage it. Install grommet (2) to injector.
2) Check if insulator (1) is scored or damaged. If it is, replace
with new one.
Install insulators and cushions (2) to intake manifold.
3) Apply thin coat of fuel to O-rings (1) and then install injectors
into delivery pipes (right and left) and intake manifold.
Make sure that injectors rotate smoothly. If not, probable
cause is incorrect installation of O-ring or grommet (2).
Replace O-ring with new one.
4) Tighten delivery pipe bolts (3) and make sure that injectors
rotate smoothly.