Tomei Powered FUEL RAIL - Manual (Page 22)

22
Fuel Pressure Adjustment & Leak Inspection
CAUTION
■ Check that the fuel pressure matches the correct reference value.
When fuel is injected into the intake manifold, the amount of fuel that is supplied into the intake
will manifold vary due to the vacuum pressure. If the fuel pressure doesn't change (High vacuum ->
increase fuel pressure. Low vaccum -> reduce fuel pressure) the fuel pressure regulator will work in
accordance with the intake manifold pressure. The correct value (approx 3.0kg/cm
2 or higher for the
manifold pressure) is then adjusted with the fuel pressure regulator. Use the fuel pressure regulator
to adjust the fuel pressure to suit the boost pressure when the car is running.
■ Check the manufacturers seal limit for each injector (usually 4.5kg/cm 2 ). When the pressure is applied, the
guaranteed seal portion of the injector, there's a chance that there could be gas leaks at the time of
maximum boost pressure. Please do not exceed this pressure.
① Connect the fuel pressure gauge to the fuel
pressure adapter.
② Loosen the regulators lock nut with the
adjustable bolt, up to 25mm.
③ Check for any signs of fuel leaks (1st step).
Turn the ignition key on to check
for fuel leaks. (Don't start the
engine yet)
④ Start the engine.
Plug
Fuel Pressure Gauge
Regulator
25mm Position Adjusting Bolt
Lock Nut