Actually, the OP shouldn't need to worry about a pre-pump in a 1995 940 B230FD, it was supposedly all just a single in-tank main pump by then in the North American market. Still, you're right, better safe than sorry, take a good peek under the car just to make sure there's nothing next to the fuel filter up on the mounting bracket so you know for sure it's all in-tank. You never know if it's an oddball late production 1994 that ended up plated as a 1995, especially if it came from another market.

Curiously, the Volvo Pocket Data Booklet suggests all the red block 940s ran at the same fuel pressure. The Regina and Bosch pressure regulators are both spec'd for 300 kPa (43.5 psi), shutoff is 200-300 kPa. The injectors are also listed at the same system pressure of 300 kPa, although the injection volume at that pressure is different, 170 cc/min for Regina B230F, 185 for LH B230F, 300 for LH B230FT/B234F. However, the fuel pump specs suggest a different story. Although the pump flow rates are basically the same spec at the same system voltages, the spec is at a higher working pressure for the Regina system, listed at 350 kPa (50 psi) for Regina rather than 300 kPa for Bosch. Not surprisingly if a pump has to deliver a higher working pressure, the normal current draw for the Regina pump is listed at 8.8 amps rather than 6.5 for the LH pumps. If the system pressure on the output side of the regulator is the same and the injector flow is similar, why would the working pressure for delivery to the regulator need to be be different? Must be something different about regulator designs I'm not quite grasping.
--
Dave -still with 940's, prev 740/240/140/120 You'd think I'd have learned by now