2005 S40 won't stay running
 

hi

I now have my daughters car that she left for me to deal with while she went to Alaska.

2 things that had an issue that I knew of

1. vacuum leak.
2. battery will go dead after 2 days of not driving it. brand new battery!

well it has a 3rd problem that evidently worked it self out before. and it will be a hard sell if I can't fix it.

I can start the vehicle and RPM's are at 1800 and after 5 seconds it stalls as though it runs out of gas, I can get it started most times right back up but same exact behavior.
there are times it will be about 800 RPM's and last may be 30 seconds

I replaced the sensor on the fuel rail with one I pulled from salvage yard. and still the same behavior.

I got a fuel pressure tester which I will try to get some readings.

what am I looking for?

thanks
Paul

additional info
 

even with my foot on gas pedal it will not stay running it will always stall!

I'd suggest that you should look for the vacuum leak - it might be the cause of your idle issues. Then you can look for what is draining the battery...

hmm but the vacuum leak has been before this issue

I just checked the pressure and while running it was about 8-10 psi. when I first hooked it up it was 0

I didn't notice if the fuel pump came on or not... how quiet are they in the s40?

My 2005 V50 used to run 55psi (IIRC - it was something in that range, anyway). I never had to work on my Volvo's fuel system (happily) - most modern cars have the fuel pressure regulator in the fuel pump itself - others are external, and may have a vacuum connection (obviously if this is the case, you're going to want to try to figure out that vacuum leak).