# 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. |
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).

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