Jetta L4-1781cc 1.8L SOHC (RV, PF) (1989)
SUPPLY HOSE
RETURN HOSE
Step 3. Fuel Injection System, Cleaning
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engine MUST be at operating temperature
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remove intake air boot
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disconnect fuel supply hose from plastic mainline (arrow "A"), and fuel return hose from fuel pressure regulator (arrow "B")
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connect fuel return hose to fuel supply mainline so recirculating loop is formed which returns fuel from the pump to the tank (arrow)