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Checking holding pressure > < Checking function and voltage supply

Polo Mk5

Checking fuel pressure
Checking fuel pressure
  Note
The fuel pressure regulator is located on the fuel filter.
Test procedure
  WARNING
Fuel system is under pressure! Wear eye protection and protective clothing to avoid possible injury and skin contact. Before loosening hose connections, wrap a cloth around the connection. Then release pressure by carefully pulling hose off connection.
   
–  Separate connection for fuel supply line -arrow- and catch escaping fuel with a cloth.
  Note
Press in securing ring to release fuel line.
  S10-0099
–  Connect pressure tester -V.A.G 1318- using adapters -V.A.G 1318/9- and -1318/17- as shown.
–  Open the pressure tester shut-off tap. The handle points in direction of flow.
–  Start engine and run at idling speed.
–  Measure fuel pressure.
Specification: 3.90…4.20 bar
If the specification is not attained:
  Caution
Close shut-off tap very slowly. If fuel pressure is 6 bar, re-open shut-off tap immediately to avoid damaging pressure tester.
  N24-1470
–  Close shut-off tap -arrow- on pressure gauge. Pressure must rise to min. 6 bar. When 6 bar is reached, open shut-off tap again immediately.
If pressure has risen:
–  Fuel pump is OK. Pressure limiting valve in fuel filter is defective. Renew fuel filter.
If pressure does not rise:
–  Fuel pump defective, renew fuel pump unit .
  Note
Before removing pressure tester, place a cloth around the connections to be loosened.
  N24-0618

Checking holding pressure > < Checking function and voltage supply