5000S Sedan L5-2226cc 2.22L SOHC (KZ) (1985)
Fuel Pressure: Testing and Inspection
System Pressure Test
CAUTION: When working on fuel system, always follow these precautions on cleanliness
-
thoroughly clean all unions and area near connections before disconnecting
-
place removed parts on a clean surface and cover over. Use paper or plastic sheet. Use only lint-tree cloths
-
components which have been opened or disassembled must be covered or sealed carefully if repair cannot be carried out immediately
-
only install clean components
-
only unpack replacement parts immediately before they are installed
-
do not use parts that have been stored loose (for instance, in toolboxes)
-
when fuel system is open, do not work with compressed air if this can be avoided or move car unless absolutely necessary
SYSTEM PRESSURE, CHECKING
WARNING: Fire hazard. Do not smoke or have anything in area than can ignite fuel.
-
using new sealing washers and line adapter VW 1318/5 (1), connect pressure gauge VW 1318 between fuel line at cold start valve 2 and lower
chamber test connection of fuel distributor 1.
^
gauge lever positions: A open
B closed
-
switch OFF US 4480/3
-
remove fuel pump relay and jump socket with US 4480/3
-
remove electrical connector from differential pressure regulator
-
open valve on VW 1318 pressure gauge
-
turn ON US 4480/3
-
system pressure must be 5.2 to 5.6 bar (75 to 82 psi)
If pressure BELOW specs:
-
check fuel pump delivery quantity
If fuel pump delivery quantity OK
-
replace diaphragm pressure regulator
If pressure ABOVE specs
-
disconnect fuel tank return line from diaphragm pressure regulator and repeat test
-
system pressure must be 5.2 to 5.6 bar (75 to 82 psi)
If pressure OK
-
check for plugged fuel return line
If pressure NOT OK
-
replace diaphragm pressure regulator
NOTE: System pressure not adjustable