Warm Engine Control Pressure Test
- Keep pressure gauge and valve connected in same manner as cold engine control pressure test. Bridge fuel pump relay. Reconnect control pressure regulator unplugged during cold engine control pressure test.
- OPEN valve at pressure gauge. Start and run engine at idle until fuel pressure stabilizes. Reading should be 48-54 psi (3.4-3.8 kg/cm2 ). If not, replace control pressure regulator.
NOTE:
On 1978-79 Audi 5000, pressure should be 49-53 psi (3.5-3.8 kg/cm2
) with control pressure regulator vacuum hose connected; 39-43 psi (2.8-3.1 kg/cm2
) with vacuum hose disconnected.