I've had issues getting this car (R57 cooper s) to start after a fuel filter change. It just won't spring to life. Initially I had no codes but now I have these:
jbe:
A6E4 SENSOR_TANK_LINKSA6E5 SENSOR_TANK_RECHT
instrument cluster:9319 Error Signal Tank Raw_say_filling_level_left931A Error Signal Tank Raw_say_filling_level_right

The fuel gauge in the dash appears to work correctly. Fuel level is shown and increased when fuel added to tank.


So i believe the sensors ARE working, so why the errors?
the jbe errors won't clear with my odb2.


Do you think this is a jbe issue? Something else?

 

Did you solve the failure of fuel to reach the HPFP?

 

Not yet. I have a new pump to go in but these codes just arrived so i was wondering what they mean.
The old pump can't be causing the codes so I thought I might be able to clear those before putting the pump in.

Plus it's interesting to know how this stuff all works.
frustrating thing is I can't find much info online, such as worrying diagrams or how the jbe works etc.

 

The codes may indicate an issue with the fuel level sender connector (e.g., not properly seated), which is likely unrelated to the fuel pump issue.

You previously posted observations suggesting that your fuel pump works, so what's the rationale for replacing it?

 

Would the errors prevent the car starting?

The last i checked the connector from the fuel filter assembly level sensor was connected correctly but I can check it again. There is no connector for the fuel pump level sensor, the wiring from that sensor goes straight to the 6 pin pump connector doesn't it?

That connector includes 6 wires: 2 for pump power. 2 for left fuel level sensor, and 2 for right fuel level sensor.

As the error is on both sensors my logic is that there must be a failure at a common point, and my guess is that could be the jbe but i can't find a wiring diagram that would tell me.


Well remembered about the other thread.
The existing fuel pump does manage to push fuel through the filter and out of the top of the assembly, but not far enough through the fuel line to reach the hpfp. When disconnected that end of the line doesn't spit out fuel, it's dry when the engine is cranked. The fuel line isn't blocked (i can blow down it). I can't test the fuel pressure so decided to throw in a new pump in case it can't produce enough pressure. Bad idea?

 

I found this diagram showing the level sensors connection to the instrument cluster.
if the wire was cut as shown that would take out both sensors BUT the dashboard fuel gauge seems to work fine.
It was indicating half full (the same as before any faults developed) and when I added 10 litres of fuel to the tank the gauge increased accordingly.

So I don't think there is a faulty with any of those wires or connections into the instrument cluster.

Do the level sensor wires go anywhere else? I don't know yet.

Why are there error codes on the jbe AND the instrument cluster? I don't know that either

 

Unplugging the fuel pump/sender connector may have thrown the codes that are no longer active. Maybe your code reader/scan tool is unable to clear BMW codes?

 

Hmm that's an interesting point.
I have a 'vpeak ODBCheck BLE+" and use bimmerlink.

What would I need to clear bmw codes?

 

You should be able to clear the fuel level sender codes with bimmerlink.

 

The instrument cluster codes clear (but later return).
when I try to clear the jbe codes the result is a message in bimmerlink saying they can't be cleared.

 

Unlikely

To diagnose the fuel pump, you can measure how many amps it pulls while running, but replacing the pump is worth a try if you can't do this electrical test.

It also may be worthwhile testing whether the two pump connector pins get battery voltage and good ground.

 

Both sensors send their fuel level information to the JBE. The JBE in turn transmits this information to the instrument cluster (Kombi) via the K-CAN network.

 

Really useful info, thanks.

Seems like I need to charge my battery as it's a bit low at the moment and the pump definitely isn't getting a minimum of 12v right now.

B
When i unscrewed the retaining ring to release the pump for the first time since my mechanic left this is what i found:




Perhaps not enough to stop the pump running properly but annoying nonetheless and I guess caused by the clueless mechanic (who I dismissed from the job). I managed to scoop out a piece of metal from the tank that fell in as i recovered the old pump.

So I needed a new pump in the end anyway. I fitted it and now I have fuel getting to the HPFP!!!
That's good progress BUT after a few tries the car still won't start. The engine turns over but no ignition at all.


Oh and I tested the resistance of the fuel level sensors on both the left and right. Both seem to operate perfectly well.

Anyway, now to figure it why the engine still won't start.

How best to test the HPFP?

 

Congrats on fuel to the HPFP!

Before considering the HPFP, make absolutely sure that all air is bled out of the low pressure fuel line.

 

Thank you, it's nice to feel like I've made positive progress.
How do I ensure air is out? ?
I found this in a Mini workshop manual, which it says is for an N47 engine. Mine is N18.



does this look about right?

 

^Good find. That sounds right.

Just an FYI...Turbo Minis have a fuel pressure sensor located on the fuel rail. Therefore, you should be able to use Bimmerlink to monitor fuel pressure downstream of the HPFP.

 

Ok I'll try this tomorrow (night time here now) and report back.
I'll also check out the pressure using bimmerlink. Previously when I checked it there was nothing but that was because fuel wasn't getting that far.

FINGERS CROSSED!

 

Just curious. Did the fuel level sensor codes disappear after charging the battery or installing the new fuel pump?

 

Following the bleed procedure i posted above a few times didn't work.
I then just tried starting it 10 times with a 5 second break between each time but that was also unsuccessful.

I removed a spark plug to see if I could detect fresh fuel and I don't think there was any. No obvious wetness, no strong fuel smell (just a fair smell).;

I used Bimmerlink to check fuel pressure before i tried to start the engine. it was 680kPa. It didn't change when I tried to start the engine.


I have also been able to clear those fuel level error codes and they haven't reappeared, which is good news.





I've been looking at the price of a new high pressure fuel pump because I think I'm running out of options now. I think i might just have to change it.

 

Below is the pressure reading from the LPFP. What is the pressure reading from the HPFP?

 

I couldn't find anything for high pressure fuel pump in bimmerlink or car scanner so i replaced the hpfp. Sadly i need a cable adapter because the new pump has a different connector fitted. Apparently this is normal, but i didn't know. So I'm waiting for that cable now....


Unfortunately the oem bmw Adapters need to be wired into the harness after removing the original connector!



I'm strongly considering that I may have an immobiliser issue. Perhaps I did something to cause the immobiliser to kick in.

 

Rationale?

 

None other than the car won't start and I'm running out of options. I'm no mechanic as you've probably realised

Serially though, if the car won't start when I connect the harness to the hpfp what else is there to try?


I've got a new lpfp that pumps fuel to the hpfp
A new hpfp
A new filter and filter assembly.
The fuel line between lpfp and hpfp isn't blocked.
There are no no error codes or lights on the dash.

I've still to check for spark but i have no doubt it's there.

 

An immobilizer issue would cause a "no crank" problem rather than a "cranks but won't start" problem.

Let's wait to see what happens when you wire up the new HPFP. If engine won't start after that, you will need to verify that the HPFP is actually working (rail fuel pressure).

If necessary, the next diagnostics would be to check the fuel injectors, spark, and cylinder compression.

 

New HPFP installed and still get "crank but no start".


I also get this error code
man, this is annoying.