780 V6-2849cc 2.8L SOHC B280F (1987)
Fuel Pressure Regulator: Testing and Inspection
This is the same testing procedure as the one found under FUEL SYSTEM PRESSURE TEST.
NOTE: This testing procedure will test the following to avoid misdiagnosis of an individual component:
a. Fuel pumps
b. Pressure regulator
c. Fuel lines
d. Fuel system pressure
Connecting Fuel Pressure Tester
1.
Turn ignition OFF.
2.
Connect pressure gauge (Volvo tool #5011 or equivalent) as shown in the image. Use Volvo hose #5116, adapter set #5332 and nipple #5265 or
equivalent to install tester.
WARNING: Fuel lines are under pressure. When disconnecting fuel lines, cover the connection with a shop towel to protect yourself from the
excess pressurized fuel.
3.
Open the valve of pressure gauge to center position.
Bridging System Relay
4.
To start fuel pumps, remove the system relay (Located in center console relay shelf behind passenger side cover.
5.
Connect a lead between terminals 30 and 87/2 on relay base. The fuel pumps should start operating. Check by listening to the pumps. Fuel tank
pump can be heard by removing the tank cap.
a. If fuel pumps run, proceed with step 10.
b. If fuel pump(s) do not run, proceed with next steps.
6.
Remove the wire between terminals 30 and 87/2.
7.
Check that terminal 30 has system voltage. If not, repair wire or connection between relay socket and battery.
8.
Reconnect the wire between terminals 30 and 87/2.
9.
Fuel pumps should now operate. If not:
a. Check wire between relay socket and fuel pumps. Repair as needed.