Measure fuel pressure

Fig 1: Identifying Test Drive

Courtesy of VOLVO CARS OF NORTH AMERICA.

Corrective actions:

Start the engine.
Drive the car and read off fuel pressure while the car is being driven. The fuel pressure should be:375-395 kPa (54.4 - 57.3 psi) .

CAUTION:

Note At constant engine loads the fuel pressure should be stable. At acceleration or during engine braking the fuel pressure may vary between the maximum and minimum readings.