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Fuel pressure, check.

Install a fuel pressure gauge in the fuel feed line.

Feed line is at rear of fuel rail, by number 4 throttle body.  It may be necessary to remove purge hose from valve cover (red arrow) for access. Install purge hose before starting engine.

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Fuel gauge must be attached to the  fuel line with a T fitting.  Fuel must enter the gauge, but still continue on to the fuel rail for accurate readings.
Follow directions from fuel pressure gauge manufacturer.
Check fuel pressure without blocking return line. Pressure at idle should be 3.0 bar ( approx. 42 psi).

 

 

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E30 M3 Repair Manual V2.7.  Copyright ©1999-2001 Koala Motorsport & Brett Anderson