Fuel Pressure Regulator
- If fuel pressure gauge is already attached, go to next step. If gauge is not attached, disconnect banjo coupling at inlet to fuel injection manifold. Connect fuel pressure gauge at this point, using existing seals. Hang pressure gauge vertically.
- Connect Pressure Gauge (83-93-514 ) and "Y" connection to vacuum port of fuel pressure regulator. Hang gauge vertically. Connect pressure/vacuum tester to "Y" connection.
- Remove fuse No. 14 (20-amp). Connect a fused jumper lead between fuse No. 22 and load side slot of fuse No. 14. This will provide current to fuel pump. Turn ignition on.
- Fuel pressure should increase to about 43 psi (3.0 kg/cm2
). Install vacuum pump to "Y" connection. Fuel pressure should be about 43 psi (3.0 kg/cm2
). Use vacuum pump to reduce system pressures as specified in REGULATED FUEL PRESSURE (VACUUM APPLIED)
table. Compare fuel pressure to specification. Disconnect vacuum pump.REGULATED FUEL PRESSURE (VACUUM APPLIED)
Applied Vacuum In. Hg Fuel Pressure psi (kg/cm2 ) 0 43 (3.0) 5 40.5 (2.9) 10 38 (2.7) 15 35.5 (2.5) - On turbo models, increase pressure as specified in REGULATED FUEL PRESSURE (PRESSURE APPLIED)
table. Compare fuel pressure to specification.REGULATED FUEL PRESSURE (PRESSURE APPLIED)
Applied Pressure psi (kg/cm2 ) Fuel Pressure psi (kg/cm2 ) 0 (0) 43 (3.0) 3.0 (0.2) 46 (3.3) 6.0 (0.4) 49 (3.5) 8.5 (0.6) 51.5 (3.9) - Turn ignition on to operate fuel pump. Verify fuel pressure is 43 psi (3.0 kg/cm2 ). Turn ignition off. Pressure should drop 1.4-2.8 psi (0.1-0.2 kg/cm2 ) and then hold steady for at least 10 minutes.
- If pressure drop is more than specified, inspect for leakage in pressure regulator and fuel pump non-return valve.