Electra V6-260 4.3L DSL (1984)
2.
Install a hose over the pipe outlet and put the other end of the hose into a container.
3.
Start the engine.
4.
If the housing pressure is now 62-75 kPa (9-11 psi), either the return pipes, hoses or tank unit are restricted.
"E"
1.
Reconnect the pump return pipe to the HPAA solenoid.
2.
Disconnect the return pipe (tank side) from the HPAA solenoid.
3.
Place a hose over the HPAA outlet and put the other end of the hose into a container.
4.
Start the engine.
"F"
1.
Remove HPAA solenoid assembly from the engine.
2.
Using a maximum of 207 kPa (30 psi) of air pressure, blow through the assembly from the pump side first and then from the outlet side. Air should
flow in both directions. If not, replace the assembly.
CAUTION: Safety glasses must be worn when using compressed air to avoid injury to the eyes.
3.
Remove the pressure regulator from the solenoid.
4.
See if the solenoid plunger is free to move. If not, replace the assembly.
5.
To check solenoid operation:
a.
Ground the solenoid housing using a jumper lead to a 12V battery's negative terminal.
b.
Attach another jumper lead to the same 12V battery's positive terminal and connect this jumper to the solenoid lead terminal.
c.
The solenoid plunger should move inward with 12V applied and move fully back when the jumper is disconnected.
6.
To adjust the HPAA pressure regulator:
a.
Install the HPAA assembly onto the fuel return pipes.
b.
Connect a jumper lead to the positive terminal of the battery. Connect the jumper to the HPAA solenoid lead terminal.
c.
Start the engine and record housing pressure, it should be:
Low Altitude (NA5) - 103.42 - 131 kPa (15-19 psi) V-6 engine
-
93-120.66 kPa (13.5-17.5 psi) V-8 engine
High Altitude (NA6) - 75.8-103.38 kPa (11-15 psi) V-6 engine VIN Code T
-
68.9-96.48 kPa (10-14 psi) V-6 engine VIN Code V
-
93-120.6 kPa (13.5-17.5 psi) V-8 engine
d.
If housing pressure is not within specification:
1.
Disconnect the jumper to the HPAA.
2.
Housing pressure should now be 62-75.8 kPa (9-11 psi). If not, adjust the housing pressure regulator.
3.
Reconnect the jumper to the HPAA. Record the housing pressure. If not, 89.63-117.21 kPa (13-17 psi), adjust the HPAA pressure regulator.
4.
Remove the HPAA assembly from the engine.
5.
Remove the line fitting from the pressure regulator.
6.
Insert a 1/8" HEX key in the regulator (Figure 2). Rotate the adjustment screw clockwise to increase pressure, counterclockwise to decrease
pressure. One turn of the screw will change housing pressure 22 kPa (3.2 psi).
