Fuel Pressure Regulator
- If fuel pressure gauge is already attached, go to step 2). If fuel pressure gauge is not attached, disconnect banjo coupling at inlet to fuel injection manifold. Connect fuel pressure gauge at this point, using existing seals. Ensure pressure gauge hangs vertically.
- Connect Vacuum Gauge (83 93 514), with "Y" connection, to vacuum port of fuel pressure regulator. Hang pressure gauge vertically. Connect cooling system pressure tester to "Y" connection.
- Turn ignition off. Remove fuse number 30. Connect a jumper lead between fuse 27, 28, or 29 and slot of fuse 30, to provide current to fuel pump. Turn ignition on.
- Line pressure should rise to about 36.3 psi (2.57 kg/cm2
)). Using a pressure tester, raise system pressure to various test pressures, and compare line pressure to specification. See APPLIED PRESSURE REGULATOR SPECIFICATIONS table.APPLIED PRESSURE REGULATOR SPECIFICATIONS
Applied Pressure: psi (kg/cm2 ) Line Pressure: psi (kg/cm2 ) 0 (0) 36.3 (2.6) 2.7 (.19) 39.2 (2.8) 2.9 (.20) 42.1 (3.0) 3.1 (.22) 44.95 (3.2) - Remove pressure tester. Install vacuum pump to "Y" connection. Line pressure should be at about 36.3 psi (2.57 kg/cm2
). Use vacuum pump to create various test vacuums, and compare vacuum readings to specification. See APPLIED VACUUM REGULATOR SPECIFICATIONS table.APPLIED VACUUM REGULATOR SPECIFICATIONS
Applied Vacuum: In. Hg Line Pressure: psi (kg/cm2 ) 0 (0) 36.3 (2.5) -2.7 39.2 (2.8) -2.9 42.1 (3.0) -3.1 45.0 (3.2) - Turn ignition on to operate fuel pump. Verify line pressure of 36.3 psi (2.57 kg/cm2 )). Turn ignition off. Check pressure gauge reading. Pressure should drop 1.45-2.90 psi (.10-.20 kg/cm2 )), and then hold steady for at least 10 minutes.
- If pressure drops more than specified, check for leakage in pressure regulator and fuel pump non-return valve.