Isuzu 4JA1 Workshop Manual page 195

8. Check leak.
Methed of leak check.
(1) Plug end of quick connector and breather hose (Pull off
the breather hose from fuel tank) and tighten fuel filler
cap until at least one click are heard.
(2) Apply water soap around the fuel gauge unit seal area.
(3) Pressure air into the fuel tank from end of breather pipe
at 5psi (34.5 kPa/0.35kgf/cm
(4) Verify no bubbles around the fuel gauge unit seal area.
9. Install the fuel tank assembly (9).
NOTE: Refer to "Install the fuel tank" in this section.
FUEL SYSTEM 6C – 13
2
) over 15 seconds.