BMW E30 fuel pressure and pressure regulator
316i
Where is the E30's fuel pressure regulator?
The pressure regulator is at the end of the fuel rail.
How is the E30 fuel pressure regulator tested?
Connect a pressure gauge to the supply hose before the regulator, which shows the pressure produced by the pump. The pressure set by the regulator shows in the supply and distribution pipe. If the regulator is broken, there is hardly any pressure.
Why does the E30's fuel pressure disappear right after shutdown?
The cause can be a leaking check valve in the fuel pump. On an M40 engine the pressure dropped to zero in less than ten seconds. A faulty check valve is replaced.
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