Should I replace my old EKPM3 module with a new one?

Jeffman

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Jan 7, 2017
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My 2008 335xi E90 came with an EKPM3 module. In the last year or so my LPFP pressures no longer stay at 72psi when cruising or idling. Instead pressures drift down into the 60s, and then into the 50s, and then into the 40s as I drove along and the engine heats up. The engine otherwise feels fine.
I have a Fuel-It Stage 2 Walbro 450 LPFP installed for the last 3-4 years.

Based on what I’ve read this problem typically occurs with thre older EKPM2 modules and the solution is to upgrade to an EKPM3 module. But I already have the EKPM3, so I’m wondering whether anybody has solved the LPFP pressure problem by replacing an old EKPM3 module with a new one?

Thanks.
 
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matreyia

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Try replacing and coding the module. If that don't work then replace lpfp sesnor and hpfp sensor.

I know you cannot retunr thebitem o ce coded but you won't know if you don't.

Thatexactly what i did.

My 2008 335xi E90 came with an EKPM3 module. In the last year or so my LPFP pressures no longer stay at 72psi when cruising or idling. Instead pressures drift down into the 60s, and then into the 50s, and then into the 40s as I drove along and the engine heats up. The engine otherwise feels fine.
I have a Fuel-It Stage 2 Walbro 450 LPFP installed for the last 3-4 years.

Based on what I’ve read this problem typically occurs with thre older EKPM2 modules and the solution is to upgrade to an EKPM3 module. But I already have the EKPM3, so I’m wondering whether anybody has solved the LPFP pressure problem by replacing an old EKPM3 module with a new one?

Thanks.
 

matreyia

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Apr 19, 2017
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Did you replace an old EKPM3 with a new EKPM3?

Yep. And put a heatsink too...but the heatsink did nothing. And neither did the v3 module. It was to prevent the stupid fuel pump plausibility error. That did not fix a thing.
 

mfish123

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Rob09msport

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Rather than new module why not try the fuel it 650 it's a stock pump with an add on pump so it doesn't tax your stock wiring ,dme,etc
 

Jeffman

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Rather than new module why not try the fuel it 650 it's a stock pump with an add on pump so it doesn't tax your stock wiring ,dme,etc
That could be a viable solution, if the install wasn’t such a PITA. I dreaded doing the LPFP Stage 2 upgrade - leaning over the back seat breathing gasoline vapor and struggling to get the damn thing installed. Changing a module is a lot easier.
 

Jeffman

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google "torqbyte n54 ekpm" or look up their instagram

should be released in the coming weeks
Ooohhh... this looks promising. As long as it’s plug and play (I hate splicing wires togtether, especially high-powered ones) then this thing looks like a winner!
 

fmorelli

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That could be a viable solution, if the install wasn’t such a PITA. I dreaded doing the LPFP Stage 2 upgrade - leaning over the back seat breathing gasoline vapor and struggling to get the damn thing installed. Changing a module is a lot easier.
You should have a Z4 and do that job from the bottom with the exhaust having to be removed to do it. Wash your mouth out with soap, brother. You got it easy! lol ...

Filippo
 
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Jeffman

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I once saw a “lift” that holds a car up and at a steep (45?) degree angle to make it easier to work underneath the car. That could come in handy for Z4 owners.
 

Rob09msport

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That could be a viable solution, if the install wasn’t such a PITA. I dreaded doing the LPFP Stage 2 upgrade - leaning over the back seat breathing gasoline vapor and struggling to get the damn thing installed. Changing a module is a lot easier.
I know im a hypocrite I have wanted to go back to bucketed setup for auto x purposes or a mat and I keep bitching out.
 

veer90

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OP your issue is likely not the module (unless it has high miles). I took apart my fuel-it stage 2 when I put together my DIY stage 3. Re-used the single walbro they supplied and everything. There was no issue with the pump at all, just the setup.

I had the same issues you did where the idle fuel pressure wasn't maintained at 72 psi. It would hover around 50 and dip into the 40s during pulls. The Fuel-It "custom" venturi fitting belongs in the garbage. The orifice is too big, the venturi eats up too much pressure causing inadequate pressure to be delivered to the hpfp/engine.

Steve's (hilarious) excuse for this was "cars don't need 72 psi at idle" which is horse shit as BMW spec states 5 +/- 0.5 bar.
 
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Jeffman

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OP your issue is likely not the module (unless it has high miles). I took apart my fuel-it stage 2 when I put together my DIY stage 3. Re-used the single walbro they supplied and everything. There was no issue with the pump at all, just the setup.

I had the same issues you did where the idle fuel pressure wasn't maintained at 72 psi. It would hover around 50 and dip into the 40s during pulls. The Fuel-It "custom" venturi fitting belongs in the garbage. The orifice is too big, the venturi eats up too much pressure causing inadequate pressure to be delivered to the hpfp/engine.

Steve's (hilarious) excuse for this was "cars don't need 72 psi at idle" which is horse shit as BMW spec states 5 +/- 0.5 bar.

I’ve had my 10 y.o. car since new 66,000 miles ago, mostly garaged, so it’s certainly not a high mileage car, so based on your comments it’s not the module.

Your idea that the inadequate venturi has merit. What do you suggest / what did you do? Do you have a pic of your DIY Stage 3 that shows what you did to get around the crappy FuelIt Stage 2 venturi tube?
Thanks.
 

veer90

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I’ve had my 10 y.o. car since new 66,000 miles ago, mostly garaged, so it’s certainly not a high mileage car, so based on your comments it’s not the module.

Your idea that the inadequate venturi has merit. What do you suggest / what did you do? Do you have a pic of your DIY Stage 3 that shows what you did to get around the crappy FuelIt Stage 2 venturi tube?
Thanks.

I chopped off the venturi and the bottom of the bucket lol
 

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mfish123

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I chopped off the venturi and the bottom of the bucket lol

@veer90 @Jeffman I'm in a very similar boat to Jeffman. i have a fuel-it stage 2 pump with the bucket. More details on my specific situation earlier in this thread.

What's odd with my situation is that my stage 2 pump did idle around 72 psi for about 3 years and just recently it started staying around 50 psi. As far as the venturi fitting does it maybe just barely work when brand new and degrade over time? Just trying to figure out why I only started having this problem recently.

Do you or anyone else following along know if a smaller orifice can be retrofitted if the problem is just that the orifice is too big?
 

Jeffman

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@veer90 @Jeffman I'm in a very similar boat to Jeffman. i have a fuel-it stage 2 pump with the bucket. More details on my specific situation earlier in this thread.

What's odd with my situation is that my stage 2 pump did idle around 72 psi for about 3 years and just recently it started staying around 50 psi. As far as the venturi fitting does it maybe just barely work when brand new and degrade over time? Just trying to figure out why I only started having this problem recently.

Do you or anyone else following along know if a smaller orifice can be retrofitted if the problem is just that the orifice is too big?
@mfish123 I am avoiding going back into my gas tank. I haven’t tried,and don’t plan to modify my FuelZit LPFP 2 pump lol.
 

matreyia

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@veer90 @Jeffman I'm in a very similar boat to Jeffman. i have a fuel-it stage 2 pump with the bucket. More details on my specific situation earlier in this thread.

What's odd with my situation is that my stage 2 pump did idle around 72 psi for about 3 years and just recently it started staying around 50 psi. As far as the venturi fitting does it maybe just barely work when brand new and degrade over time? Just trying to figure out why I only started having this problem recently.

Do you or anyone else following along know if a smaller orifice can be retrofitted if the problem is just that the orifice is too big?

Things break down... I would be surprised if yours or anyone's car stayed fully 100% over time. 3yrs is short, but then again, I assume you are using your s2 lpfp more aggressively in various ways than normal drivers. Otherwise, you would not have or need a stage 2. The same reasoning goes for my stage 3. If it breaks, then them's the breaks for us all.
 
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Jeffman

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Agreed!

My car is basically a light-duty daily driver (4K miles/year) which I occasionally like to fill up with E50 and enjoy a little spirited driving. Never been to a track, and probably never will. :)