Fuel Pump Preventive Maintenance? - Page 2 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #11 of 24 Old 7th July 2019, 12:03 AM
Freude_am_Fahren
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Originally Posted by MMMotorsport View Post
The bimmerfest link shows an E39 indeed, but not an E39 M5: Our M5 battery is sitting in the middle of the trunk. If you scroll a few plots downwards on the bimmerfest link, you can see the battery sitting on the right side of the trunk, under the relay carrier. The relay setting between various E39 models differs considerably.

The realoem plot-location of your wrong (5-pins) relay, shows the right location for the black, 8-pins*, EKP-modele = K96 relay: The relay carrier, behind the right side cover, in the trunk.

Before dumping your present K96 relay, you could have a look inside (open it up with 4 cocktail-sticks between bottom plate and the casing walls). Re-solder the connections of especially the small pins 1 and 7 to the PCB. You'll need a regulated soldering iron for this, because the solder connections require a bit increased temperature setting before they melt.

*) Only the relay female-connector X10156 has 9 pins. Connector 3 is not occupied. Connectors 4, 5 and 9 carry no wire. You would almost start thinking 5-pins is enough ...

Last edited by Freude_am_Fahren; 7th July 2019 at 01:02 AM.
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post #12 of 24 Old 7th July 2019, 12:46 PM
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Seems we have to do this again. I get this is a hard topic because it is confusing, the company puts out poor and incorrect information. I just thought that a topic that has caused so much anger and frustration in the past, might have lessons that stuck.

You have to identify you relay physically. If it is the standard relay then that is in the glove box(after a certain year), but if it is electronic (big black) it will be in the trunk.
The difference between the two devices is for OBDII compliance. There has been discussions and some evidence that standard relays might have gone in some US cars, but to the best of my knowledge no one here has ever found one.
Euro cars and others not using OBDII are different. There have been more than a few later model UK cars that did have a standard relay, then to make matters worse it was in the freaking trunk!

YOU MUST FIND YOURS IN CAR! Although on a NA car it seems super likely it will be electronic and in the trunk, it is said some were made the other way. These parts do not interchange because the DME has different programing for both.
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post #13 of 24 Old 8th July 2019, 04:38 AM Thread Starter
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Originally Posted by Sailor24 View Post
Seems we have to do this again. I get this is a hard topic because it is confusing, the company puts out poor and incorrect information. I just thought that a topic that has caused so much anger and frustration in the past, might have lessons that stuck.

You have to identify you relay physically. If it is the standard relay then that is in the glove box(after a certain year), but if it is electronic (big black) it will be in the trunk.
The difference between the two devices is for OBDII compliance. There has been discussions and some evidence that standard relays might have gone in some US cars, but to the best of my knowledge no one here has ever found one.
Euro cars and others not using OBDII are different. There have been more than a few later model UK cars that did have a standard relay, then to make matters worse it was in the freaking trunk!

YOU MUST FIND YOURS IN CAR! Although on a NA car it seems super likely it will be electronic and in the trunk, it is said some were made the other way. These parts do not interchange because the DME has different programing for both.
Sailor,
I seen where you had some passion around this topic in previous posts to where you were engaging your engineer friends to come up with something better.

My trunk does not have the big black relay in the trunk that I recall (US 2002 E39 M5), but the part I ordered is the big black relay based on my VIN and the part supplier. That is why I was assuming (perhaps wrong) it would be behind the glovebox.

I will certainly find out soon when it arrives and I ride my bicycle to my car with relay in hand and hopefully start it with said bicycle on roof when coming home to then also change out the pump and filter. Otherwise it will be an angry round bike trip to get the right relay!
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post #14 of 24 Old 8th July 2019, 06:45 PM
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Take a paper clip with you! I take it you have not found this thread?
https://www.m5board.com/vbulletin/e3...pper-wire.html
That is where you should have been directed first. Does not mater which relay you have jump it with a paper clip and the fuel pump should run unless the issue is the pump or wiring to it.
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post #15 of 24 Old 8th July 2019, 09:24 PM Thread Starter
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Originally Posted by Sailor24 View Post
Take a paper clip with you! I take it you have not found this thread?
https://www.m5board.com/vbulletin/e3...pper-wire.html
That is where you should have been directed first. Does not mater which relay you have jump it with a paper clip and the fuel pump should run unless the issue is the pump or wiring to it.
The big relay just arrived now. After all this, I still don't know where it goes! That seems like it should be simple. I will bring jumper wire in any case--good idea!
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post #16 of 24 Old 9th July 2019, 02:05 AM
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If you don't know where it goes you are the only one to blame for that. Even if you just had clicked the link and not really even read it, you should not have missed the second picture in the thread, but there are more to help you understand.
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post #17 of 24 Old 9th July 2019, 03:23 AM Thread Starter
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Sailor,
Not so much. As stated, there is confusing literature that I have read and I do not have the luxury of the car with me to check at this time. It certainly looks like it will be in the trunk—and if not, out comes the glovebox.

Thanks anyway.
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post #18 of 24 Old 9th July 2019, 03:23 AM Thread Starter
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post #19 of 24 Old 9th July 2019, 03:23 AM Thread Starter
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post #20 of 24 Old 9th July 2019, 03:51 AM
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Fuel Pump Preventive Maintenance?

Good points Sailor24. Also use non-ethanol fuel to extend the life of your fuel pump. My M5 runs only on pure gasoline.

Last edited by RobertDenali; 9th July 2019 at 03:52 AM.
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