Dear rjritterjr92,

Hope you're well and stay so. Volvo #3507736 is the correct fuel pump for 940s with Rex/Regina ignition/engine management. This in-tank pump does not have a "check valve" and there's no obvious place to retrofit one.

Volvo VADIS - a superseded dealer parts/service database - has fuel system diagrams and parts lists. These show that 940s with Bosch ignition/engine management - up to and including the '94 models - have a dual pump system with a check valve. These models have an in-tank pre-pump and a main pump mounted on the under-body.

In 1995, 940s with Bosch ignition/engine management have a single in-tank pump. There is no check valve.

I recite these things to make the point that single-pump fuel systems - Rex/Regina and Bosch - have no check valve. I've a '93 940 with Rex-Regina ignition/engine management. It cranks for 2-3 seconds and runs smoothly. I've replaced the in-tank pump with Volvo #3507736. The same is true of a '95 940 with a single, in-tank fuel Bosch fuel pump.

I suspect the reason your car does not start promptly is a failed/failing fuel pump relay. If this relay is the factory-original item - there should be a date on it - it is past the end of its service life. It is white, rectangular, so easy to find on the fuse/relay block, behind the front center console ashtray.

Hope this helps.

Yours faithfully,

Spook