Saab 900 8-Valve Official Service Manual 1981-1988

REPLACING FUEL PUMP CHECK VALVE A one-way check valve is used at the fuel pump supply line to hold fuel pressure in the system after the pump shuts off. A faulty valve can cause longer engine cranking on restart because of the loss of fuel system rest pressure. The check valve is tested as part of a fuel system pressure test described in 240 Fuel Injection. Various fuel pumps with different check valve types were used depending on model year. See Table a given earlier to identify the pump check valve used. Pumps with the internal check valve can only be removed with a special tool or a screwdriver filed to the dimensions shown in Fig. 20. On fuel pumps with the external check valve, remove the banjo fitting while holding the pump steady. Then carefully remove the check valve from the pump. Install the new check valve and the banjo fitting, using new sealing washers. See Fig. 21.
FUEL TANK, LINES AND FUEL SENDER FUEL TANK The fuel tank is held in place with two straps. Removal and installation is fairly straight forward as long as the rear of the car can be raised and supported securely. The following information is a general guide to the necessary steps for tank removal and installation.

The repair groups found within the 4 TRANSMISSION section contain manual and automatic transmission service and repair information. Some of the information contained in these repair groups is intended to be used as a guide for the professional or experienced automotive technician. In addition, some of the operations require special equipment. Transmission and final drive rebuilding are specialized repairs requiring many special Saab tools. Therefore, these operations are not within the scope of this manual and have not been included. Procedures for changing the manual transmission lubricant, automatic transmission fluid, or final drive fluid (automatics only) are covered in 1 LUBRICATION AND MAINTENANCE. Removal of the transmission is covered in 2 ENGINE.
TRANSMISSION ASSEMBLY The Saab transmission is a unique design in that it is bolted directly to the bottom of the engine. The top section of the transmission housing serves as the engine oil sump and the engine oil is completely sealed off from the transmission lubricant. Power is transferred from the engine down to the transmission via a chain at the front of the engine/transmission assembly. Power then flows through the gearset to the final drive and out to the drive axles to drive the front wheels.
MANUAL TRANSMISSION The 5-speed transmission is shown in Fig. 1. The transmission case contains the primary chain, the mainshaft, and the layshaft. At the end of the transmission is the integral final drive housing containing the differential and the ring and pinion gears. The transmission and final drive housing has one common bath of lubricating oil.