fuel problem with my 940

[kaiwahine]

I have a 1993 940 wagon with 133kmiles that won't start. It started fine this week, but was idling very rough, became sluggish accelerating and stalled when I stopped at a light. Managed to get it home and this morning it won't start at all. It had a new fuel pump and relay installed in Feb. The engine turns over fine, but no fuel seems to be getting past the filter and pump up to the main line under the hood. Fuses are all fine. Would a dirty filter cause this or is it something more serious like the fuel pressure regulator or worse???
Any ideas on the solution would be appreciated!

[Kmaniac in California USA]

From your description, it sounds like your fuel pumps are not pumping. And, yes, I mean fuel pumps (plural), because your car has two of them. One in the gas tank (the in-tank pump) and one under the car (the main fuel pump). Now for some questions:

Which fuel pump was replaced last February, the in-tank pump or the main pump, or both?

Why was the fuel pump replaced?

I have written extensively about the fuel pump issues I had with my 1986 740. There are many old postings here in this forum. I suggest you search the forum for my posts and read up on the subject.

To sum up quickly, whenever you need to change the main fuel pump, you should also change, or at least inspect the in-tank fuel pump and filter sock. A bad in-tank filter sock (one with holes in it) will destroy BOTH fuel pumps by allowing debris to foul them both. If you replace the main pump without looking at the in-tank pump and your in-tank filter has holes in it, you will destroy the new pump within a matter of months, if not weeks. Plus, the car will run normally with a disfunctional in-tank pump.

I hope this information is helpful. Keep us posted about what you find.