Taking fuel pressure readings while driving the car

WARNING: This page is about a different car, the 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.

Special tools:

9995011

9512614

9812270

9812273

9812282

Installing test equipment

Fig 1: Identifying Test Equipment

Courtesy of VOLVO CARS OF NORTH AMERICA.

Operations:

Assemble fuel pressure gauge 9995011 and new adapter hose 951 2614 .
Use foam wrapping around the fuel pressure gauge and all metal joints to avoid scratching the interior of the car or damaging the exterior paintwork.

Connecting fuel pressure gauge

Fig 2: Identifying Adapter Hose And Line Nipple

Courtesy of VOLVO CARS OF NORTH AMERICA.

Operations:

Remove throttle pulley cover.
Remove protective cap from the fuel pressure line nipple.
Install the adapter hose nipple loosely on the nipple on the fuel pressure line. The nipple will be tightened later.
Arrange hose as shown.

CAUTION:

Ensure that the hose follows the rubber trim on the plenum chamber and then out of the engine compartment at the rear corner of the bonnet, with the adapter hose joint at the T-valve outside the engine room, so the neither the bonnet or the hose are damaged when the bonnet is closed. In addition check that hose cannot contact the throttle control reel.

Fig 3: Identifying Fuel Pressure Gauge

Courtesy of VOLVO CARS OF NORTH AMERICA.

Install the T-valve to the left door mirror using tape. Note: Protect the door mirror and wing edge with foam protection as shown in the illustration.

Connecting fuel draining unit

Fig 4: Connecting Fuel Pressure Gauge (T-Valve Cock To Middle Position)

Courtesy of VOLVO CARS OF NORTH AMERICA.

The unit must be operating when the measuring equipment's hose is connected to the engine in order to reduce the risk of fuel spillage.

Operations:

Connect the fuel evacuation unit hose to the T-valve on the door mirror (position 3 in the illustration).
Turn the T-valve cock to the middle position (position 2 in the illustration).
Start the evacuation unit to get suction in the measurement unit hose to the engine.

Fig 5: Identifying Fuel Rail Nipple

Courtesy of VOLVO CARS OF NORTH AMERICA.

Operations:

Tighten nipple on fuel rail.

CAUTION:

NOTE. Check that there is no fuel leakage and that the evacuation unit is operating while the nipple is connected to the engine.

Fig 6: Connecting Fuel Pressure Gauge (T-Valve Cock Toward Engine)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Turn the T-valve cock so that it is pointing toward the engine (position 1 in the illustration) to shut off the suction from the evacuation equipment.

Fig 7: Using Tie Strap To Lock The Cock in Position Towards Engine

Courtesy of VOLVO CARS OF NORTH AMERICA.

Use a tie strap to lock the cock in the position toward the engine.

Fig 8: Removing Draining Unit Hose From T-Valve Hose Connector

Courtesy of VOLVO CARS OF NORTH AMERICA.

Remove the draining unit hose from the T-valve hose connector.
Turn off the evacuation unit when the hose is empty.
Arrange the measuring equipment hose along the rubber list on plenum chamber cover at the left bonnet hinge in such a position that the hose and bonnet are not damaged.
Carefully close the bonnet.

Fuel pressure measurement

Fig 9: Test Driving Vehicle

Courtesy of VOLVO CARS OF NORTH AMERICA.

Operations:

Start engine.
Drive the car and read off fuel pressure while the car is being driven. The fuel pressure should be: 210-31 0 kPa for aspirating engines 210-380 kPa for Turbo engines

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.

Removing fuel pressure gauge

Fig 10: Connecting Draining Unit Hose To Hose Nipple On Door Mirror

Courtesy of VOLVO CARS OF NORTH AMERICA.

Operations:

Connect the evacuation unit hose to the hose nipple on the door mirror.
Start the evacuation unit so there is suction in the hose.

Fig 11: Connecting Fuel Pressure Gauge (T-Valve Cock To Middle Position)

Courtesy of VOLVO CARS OF NORTH AMERICA.

Operations:

Remove the tie strap locking the cock on the T-nipple.
Turn the cock to the middle position (position 2) to obtain suction in the hose to the nipple in the fuel manifold on the engine.

Removing fuel draining unit

Fig 12: Identifying Adapter Hose And Line Nipple

Courtesy of VOLVO CARS OF NORTH AMERICA.

Operations:

Remove adapter hose from the engine.
Wait a few minutes in order for the hose to empty.
Turn off the draining unit.
Remove the measurement equipment and hoses from the car.

Fig 13: Identifying Fuel Rail Protective Cap

Courtesy of VOLVO CARS OF NORTH AMERICA.

Reinstall the protective cap on the fuel rail.
Reinstall throttle pulley cover.