On my 1994 Volvo 940 Station wagon there are two. My 2.3 is a turbo model, and was told they installed two, one in the tank, accessible behind and under the rear bench seat, and the other mid body next to the fuel filter.
it sounds like the fuel pump or fuel punp relay
Mounted on top and inside the fuel tank.
The fuel pump is inside the fuel tank.
The fuel pump reset switch in a 1994 Volvo 940 is located under the hood. The relay will be in the fuse box.
in the fuel tank it is part of the pump you have to turn and click it in.
Inside the fuel tank.
inside the trunk
Almost all fuel injected vehicles have a fule pump in the fuel tank. Some vehicles may have an auxillary external fuel pump ( Example: Volvo 740). The Fuel pump on a 1994 Chevy S10 is located in the fuel tank.
It is on top of the fuel tank, you can get to it by removing the bak seat.
Fuel pump is in the fuel tank, the filter, if fitted, is in-line, usually a grey cylinder in the engine compartment.
On 1990-93 models, Volvo uses three types of fuel systems - Bosch LH-Jetronic, Bendix Regina, and Bosch Motronic. "[Bendix ] Regina and post-1994 cars have only one pump". (my info source is http://www.brickboard.com/FAQ/700-900/FuelSystem.htm#FuelPumpandFIRelayDiagnosticTests) In the Regina case, that single pump is located in the fuel tank.
If it is a regina fuel system it has just one pump