fuel pump problems

[beamer adam]

thanks for getting back to me , the fuel pump is located in the tank and whatevers happening the fuel pressure at the engine is only 1.5 bar when it should be 3 bar. when i took the failing pump out it read 30 bar. but when the new pump goes in she runs fine again. i blew back the line to clear any dirt or blockage. could a failing pump relay not show up on the diagnostic computer?

[1985_BMW318i]

Typically the relays either fail or don't in what I've seen. I've changed out the master pump on mine twice in the past. Last time was recently. However it makes more noise then the two that failed ever had but works fine. I've never had a problem with plugged lines however that certainly can happen. Especially if you have had to add gas from a can that might have had some debris in it