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Hey Rich,
The check valve is on the cars fitted with Bosch fuel injection. It is located on the outlet of the under car fuel pump.
In this photo, its fitted on the outlet of the fuel pump:
http://www.fcpgroton.com/images/products/large/0580464068.JPG
Its between the yellow and black terminals. It threads into the end of the fuel pump and has a copper washer.
Here is the check valve itself.
http://www.fcpgroton.com/product-exec/product_id/5150/nm/1989_1992_Volvo_740_8_Valve_Fuel_Pump_Check_Valve/category_id/149
Like it was said before, this is only if your car is fitted with Bosch injection. The cars with the Rex-Regina setup do not have this.
If you don't know what your car has, check out this section of the FAQ:
http://www.brickboard.com/FAQ/700-900/EngineFuelinjection.htm#BoschvsRegina
Best regards, Jon 'Uncle Olaf'
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