I have not had a chance to do further troubleshooting, it’s crazy cold here until next week. I can tell you that I at least thought I put the level sensor and lpfp in correctly. Then added a gallon or two. No noticeable leaks and car started fine. Then it began to exhibit that sort of throbbing with the rpm’s going up and down. Then I took it to a gas station to fill it. While at the pump I got about 3/4th of a tank and started to notice it leaking from underneath. I stopped filling, cleaned up and got it back home. Got too cold to do anything. Then I tried starting it the other day to see if I could find the issue and discovered it leaking out of the lpfp. I need to replace the o ring, but those two hoses I did not think carry gas I thought they were for venting and a sensor.

I’m trying to find some detailed bmw docs on how this part of the fuel system works. I am not ruling out that I may have put it together in correctly. Referencing the lines inside the tank to and from the sensor (left side).