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Note The tandem pump must be checked for internal leaks between fuel side and oil side after reinstalling a used tandem pump, for example after renewing or repairing a cylinder head and/or when installing a "short" engine. When leaking it is possible for the fuel to mix with the oil which may cause the engine to fail. Special tools and workshop equipment required Procedure (blue marking) off tandem pump. – Seal fuel return union on tandem pump with a plug. Secure sealing plug with a spring-type clamp. Prepare test unit -V.A.G 1687- as follows: and -4-. – Connect test connection -5- to fuel supply union of tandem pump using a commercially available compressed air connec‐ tion and a section of fuel hose. Use a spring-type clamp to secure. Note To turn the pressure regulating valve -2- the knob must be pulled upwards. 4-cylinder diesel engine (1.9 l engine) - Edition 01.2009 146 Rep. Gr.20 - Fuel supply system
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