Somebody asked me to do this... Can anyone spot any problems with how I have captured things ?
Note I have shown use of two filters as typical for aftermarket and modified vehicles. S2/RS2 has single fuel filter under rear of the car near the tank whereas S4/S6 has it up in the engine bay.
Fuel pressure regulator is always at end of the fuel rail so that it controls the pressure applied to all injectors evenly.
The return side of audi fuel pressure regulators is always at the bottom of the device.
I shall add some notes to this thread on how to 'hacktivate' the fuel pump relay so that its possible to test behaviour of fuel rail pressure in response to a variety of control/manifold pressure without the engine actually running.
I just realised that I haven't included a non-return valve on the feed... our fuel pumps incorporate that but others may not. This (along with the diaphragm in the regulator) ensures there is some pressure stored in the fuel rail after shutdown to make for swift restarting... vs the pump having to push fuel all the way up the pipe to engine every time the motor is restarted.
Note I have shown use of two filters as typical for aftermarket and modified vehicles. S2/RS2 has single fuel filter under rear of the car near the tank whereas S4/S6 has it up in the engine bay.
Fuel pressure regulator is always at end of the fuel rail so that it controls the pressure applied to all injectors evenly.
The return side of audi fuel pressure regulators is always at the bottom of the device.
I shall add some notes to this thread on how to 'hacktivate' the fuel pump relay so that its possible to test behaviour of fuel rail pressure in response to a variety of control/manifold pressure without the engine actually running.
I just realised that I haven't included a non-return valve on the feed... our fuel pumps incorporate that but others may not. This (along with the diaphragm in the regulator) ensures there is some pressure stored in the fuel rail after shutdown to make for swift restarting... vs the pump having to push fuel all the way up the pipe to engine every time the motor is restarted.
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