Usually in a removable housing at the engine end of the upper radiator hose
Goto Brickboard.com
.040
Probably - remove distributor cap and look
in the fuel tank? just a wild guess.
In the 1989 Volvo 740 GL with a Bosch system it is located just above the steering column on the dash.
In the centre console behind the ash tray. AH
in the distributor in the rear of the engine. sometimes known as a hall sensor
i have a 1989 740 and mine is located on under the hood it the green 1 on the side next to the air filter
Right above the oil pan in the center of the block.
The Chiltons/Haynes 72300 has the vacuum circuits divided into the emissions, Fuel and brakes sections of their manual covering each vacuum hose.
under the left hand bumper
pull out ashtray and lighter- realys are behind ashtray