[cdziekan]

Hi, I recently purchased a 2011 335i with the n55 and I'm planning to change my oil and oil filter housing gaskets, afterward I want to "prime" the oil pump and lines. I saw a video that explained two different methods.

https://www.youtube.com/watch?v=ATJ5...nnel=HowtoDoit

The methods of priming the oil system in the video both revolve around the same idea of having the engine crank but not fire, and the first method he showed was pulling all the fuel injector wires so it wouldn't spray fuel, and the next method he simply just went to his trunk and moved two wires/plugs connected to his battery (you can see what wires I'm talking about @11:40 in the video)

He stated that moving those wires would disable the fuel feed or spark. Keep in mind he was demonstrating that on a F10 and I have a E90 so my battery looks different and doesn't have those two same plugs. I would much prefer to use the second method so I don't have to make room too pull all the injector plugs but, I don't know what to disconnect on my battery but I attached a picture of what MY battery looks like. Does anyone know what wires to pull on that battery to get the same effect of cranking but not starting? Or is there a better way I could allow my E90 to crank but not start? Any advice would be appreciated!!

[e90yyc]

This is an oil change, not an engine change. You don’t need to “prime” your oil pump. There’s nothing special about an OFHG replacement either.

If you insist on wasting your time doing a rain dance, just pull your fuel pump fuse…

Edit: Jesus Christ. Seriously? BMW is actually recommending people perform this procedure? I thought this couldn’t possibly be true, but I stand corrected.

It sounds like OP is aware of the recommended procedure and is just trying to find the easiest way to do this, but here’s a post on it anyway.

I stand by my comment that just yanking the fuel pump fuse should be the easiest way to do this.

[Serf27]

https://www.e90post.com/forums/showthread.php?t=1614465

Just pull the fuel pump fuse and crank it.

[cdziekan]

Originally Posted by Serf27

https://www.e90post.com/forums/showthread.php?t=1614465

Just pull the fuel pump fuse and crank it.

which fuse is it?

[TyroneShoelaces]

Just start the engine. NO need to prime an engine unless it's been torn completely down. OP did you also remove the crank to do your oil change?

[TheMidnightNarwhal]

Just do it the proper way and unplug each injectors it's so easy I don't understand why you would want to avoid it? Like it's not a three hour job to disconnect injectors electrical connectors haha.

Those who say it's not required, FYI BMW has a SIB that asks techs to prime the engine oil after OFHG work because of the "trend" of N55s failing after OFHG work. (Trend in quotes because I have no idea how prelevant this is just saw forum posts on here)

[Serf27]

Look up your fuse box diagram and check for the fuse.

[MtBMW73]

Originally Posted by Serf27

Look up your fuse box diagram and check for the fuse.

I came to this thread looking for the answer to this question -- which fuse controls the fuel pump? Here's an image of my fuse diagram:


It has a little gas pump symbol and says fuses: 33, 35, 58, 67, 69 and 70.

My 2013 E92 only has fuses in slots 58 and 70. I pulled them both, but the engine still fires up as soon as I hit the start button. Am I missing something?

[MtBMW73]

I figured out the battery cable method. I disconnected this cable from the battery:



Engine cranked without firing. Did it three times for ten seconds each time to prime the oil. That was actually easier than the fuse-pulling method. Hope that helps someone looking for this same answer.

[cdziekan]

Originally Posted by MtBMW73

I figured out the battery cable method. I disconnected this cable from the battery:



Engine cranked without firing. Did it three times for ten seconds each time to prime the oil. That was actually easier than the fuse-pulling method. Hope that helps someone looking for this same answer.

just saw this response. thanks!!

[shmoneho]

Your picture isnt showing anymore. which cable did you pull?

[BMW Guy]

Originally Posted by TyroneShoelaces

Just start the engine. NO need to prime an engine unless it's been torn completely down. OP did you also remove the crank to do your oil change?

It is VERY important to prime the engine after changing the OFHG, especially on the N55. Look it up.