Full Size Chevrolet V8-350 5.7L DSL (1984)
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)
V6 engine.
93-120.66 kPa (13.5-17.5 psi) V8 engine.
High Altitude (NA6)
-
75.8-103.38 kPa (11-15 psi)
V6 engine VIN Code T.
68.9-96.48 kPa (10-14 psi) V6 engine VIN Code V.
93-120.6 kPa (13.5-17.5 psi) V8 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).
"G"
When checking housing pressure using J-34151 adapter, it is not possible to unseat the housing pressure regulator with the HPCA. Normally, when the
HPAA solenoid is on, so is the HPCA solenoid. With both solenoids on, the housing pressure regulator is unseated (not regulating) and the HPAA
pressure regulator is regulating. Therefore, above about 1,200m (4,000 ft.) of elevation, actual housing pressure should be 27.58-41.37 kPa (4-6 psi). But
with tool J-34151, the pressure reading is the housing pressure with both the HPCA and HPAA regulators regulating.
To check if the HPCA solenoid is operating, remove the J-34151 adapter and install the housing pressure regulator and return line connector into the
pump cover. Connect the return fuel line. Disconnect the HPCA lead from the HPCA solenoid terminal. Start the engine. Using a jumper lead, apply 12
volts to the HPCA solenoid terminal.With the solenoid energized, there will be an increase in engine speed.
"H"
When checking housing pressure using J-34151 adapter, it is not possible to unseat the housing pressure regulator with HPCA. When the car is operated
below 1,200m (4,000 ft.) of elevation, the HPAA solenoid is energized and regulating. With both pressure regulators operating, housing pressure is
increased. Below 1,200m (4,000 ft.) of elevation, housing pressure should be:
75.8-103.38 kPa (11-15 psi) V6 engine VIN Code T.
