Jetta L4-1781cc 18L SOHC Fuel Injector Issues - Troubleshooting - Technical Service Bulletin
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connect fuel pressure gauge VW 1318 to vacant fitting on pressure regulator with Digifant adapter VW 1318/17 (arrow)
Note:
Valve on pressure gauge must be in CLOSED position (as shown)
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connect US G16 adapter kit (modified with shut-off valve) to open end of fuel feed hose using Digifant adapter-nipple (arrow)
Note:
Valve on adapter kit must be in CLOSED position (as shown)
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reinstall intake air boot