BMW Questions? Ask a BMW Repair Expert for Answers.
To be clear the lpfs is a low pressure fuel sensor, Correct?
You have a fault for low fuel pressure and the vehicle is stalling. I would check the fuel pump they are a common failure on your vehicle. I would check the fuel pressure and drive the vehicle around with a gauge attached to diagnosis the stalling.
There is no schraeder valve on your vehicle, You need to put a jumper adapter into fuel line with a schaeder port. Snap on sells the one I use. The place you need to break into the system is under the panel on the driver side near the transmission.
Can you provide the last 7 digits of the vehicle VIN please? Thanks, JP
The fuel pump control module (EKPS) is located on the right side behind the carpeted trunk panel near the battery well. Its mounted to the side of the body in a bracket behind the carpeted trim.
The module does need to be coded to work.
Do you still have fault codes for the low pressure system? If so, what are the codes and the scan tool you are using?
The EKPS module is a commonly replaced component. Your scan tool will not be able to code it though.
For that fault code though, the low pressure fuel sensor below the intake manifold on the line going into the high pressure fuel pump is a commonly failed component. When the sensor is not reading correctly, the engine will not get the proper amount of fuel to the high pressure pump, hence running poorly and stalling.
Can you read the low pressure fuel value with your scanner with the engine at idle and report back?
Perfect. Let me know whats its reading, you may have an EKPS module issue if the sensor has already been replaced.
High pressure reading is fine, appears the high pressure pump should be ok.
Your low pressure reading is low though, this is the issue. Should be around 5200-5700 hPa (5.2-5.7 bar) of pressure at idle. So, either it actually is that low, or you have a low pressure sensor reading issue. You'll need to hook up a mechanical gauge inline at the quick connect coupler (T the gauge into the line) and check the actual pressure reading.
Respond back with results once performed.
This is the fuel pressure test kit I use.
Very pricey for the do it your selfer, but it have the needed T adapter to check pressure on these engines. I'm looking into alternatives now.
Rating should be available for you now. Thanks,