need help with fuel issues

[eric16v]

i ve recently been having problems with my 318is stalling out on me. I will be driving along with no issues when i feel the car hicup or bog down on me as if i had run out of gas. i thought it was the fuel pump because the engine is cranking but wont actually start. but then after a while the car can be started and drivin as if nothing ever happened. usually when the pump goes out it s out. or? when i got home i diconnected the line after the filter and cranked it and fuel was flowing at a pretty good rate. so i put everything back together and started it up. it ran good for about 5 mins. but then it dies from lack of fuel. any one have any ideas? also where is the pressure regulator located?
Thanks in advance.

[AcSchnitzer318is]

fuel pressure regulator is under the upper intake manifold on the front of the fuel rail.  Sorry can't help you with the rest of your problem.  This happened to a buddy and we traced it to an electrical break just underneath the bottom seat at the pump.  Might want to pull your seat and check your wires...

[strad]

Check relays as well.  They are under the wiring loom cover that runs across the firewall behind the intake manifold.

[eric16v]

The relays on the driver side right? I believe there are two big orange ones. do you know which is for the fuel pump? and how do you test them?

[strad]

Not in the fuse box.  Under that black plastic wiring cover in the center, between the manifold and firewall.  I can't remember what color they all are.  The main relay on mine was white though, and the other two are exactly the same as one another.  I haven't actually had to test them, so am not the expert there, but what you can do is clean the contacts -- that should solve any intermittent electricity problems.

[eric16v]

i checked my CPS and i found the resistance between term. i and 2 is at 501 ohms. people on the forum said it should be at 650 ohms +/- 10%. is this in range? im not sure but i think its out. any suggestions?

[mmkale]

i had the same prob once. it was the fuel pump itself. apparently, after the fuel pump runs for a bit the shaft gets stuck. let it sit for a good while and it'll run again, sometimes for hours.

[eric16v]

Ended up changing the cam position sensor and having the AFM rebuilt. Seemed to solve the issues.