Technical best lpfp upgrade on the stock ekp?

lituga

Lurker
Jul 3, 2020
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hey all,

what's the best lpfp upgrade running on a stock ekp? I've seen that some folks even have voltage problems running a walbro 450 - let alone a dw400 or wb525; although I'll only be running 93 pump so my flow probably won't be as high as it would be with any ethanol.

fuel it has a stage 2 upgrade listed where the stock lpfp is retained and a second one is added alongside, turned on using a hobb's switch.

I want something that will be easy and reliable -- if the parallel + hobbs switch setup requires a lot more involved tuning + troubleshooting then it probably isn't worth it to me.

thanks
 

Jmantx

Corporal
Mar 27, 2022
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I have a Precision Raceworks bucketed Walbro 450 from ECS Tuning. It works like factory. I don't have any issues with voltage or fuel pressure.
 

Torgus

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Nov 6, 2016
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ACF 6466 E92 + METH
I would DIY a walbro 450. It is easy to do.

I would still do the $20 worth of ekp cooling mods because they are inexpensive and then code out that voltage warning code or whatever it is.

If you need more just run a 525 on a relay and hobbs etc.
 
Last edited:

lituga

Lurker
Jul 3, 2020
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I have a Precision Raceworks bucketed Walbro 450 from ECS Tuning. It works like factory. I don't have any issues with voltage or fuel pressure.
awesome I was looking at that or the DW400. so absolutely no issues with the 450? hot days in the summer?

only ask because it seems some people have issues overheating the EKP with the 450 -- but it seems mainly the bucketless diy types and I'm sticking with a bucket
 

Jmantx

Corporal
Mar 27, 2022
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awesome I was looking at that or the DW400. so absolutely no issues with the 450? hot days in the summer?

only ask because it seems some people have issues overheating the EKP with the 450 -- but it seems mainly the bucketless diy types and I'm sticking with a bucket
Nope, no issues. I'm in Texas, so it has seen 105° F days and worked great.
 
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jeremycnwy

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Jun 7, 2022
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last two years or so ive been running a single 535 in the stock bucket. stock ekp has been flawless. even now with my 6266 i dont start running out of fuel until im runing e50+ mixes and 25psi+..
 
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rev210

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Feb 24, 2019
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335i - 08 Coupe .
I have twin 450s (stg 3) and the and std EKP. No issues 'yet' after quite a few years.
People have mentioned the newer, higher flowing 535, this would be a good choice.
 
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xargentum

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Feb 10, 2023
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I have Walbro F90000295 (535), with stock EKP, but with active cooling. No problems with full E85 ✌️
 

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lituga

Lurker
Jul 3, 2020
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Walbro F90000295 (535), draws less current and flows more than the 285 and 274 versions.

those charts look amazing. I see the reason why it's so strong for the current is the lack of check valve -- you notice any drawbacks like long start up times, etc?

Otherwise that 535 will be the way .. and even matches the car model number which can count as an extra sign
 

amerikanist

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Feb 24, 2023
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Hello, like this.
A complete noob here trying to diagnose EKP issues in my 2016 F32 N55. The engine stalls intermittently and very randomly giving HPFP and insufficient fuel flow errors. I was advised this is likely due to overheating EKP. I have zero mods installed, so trying to understand if setting up active cooling will help with the issue.

Do EKPs go bad with time?

Should I just replace it instead of modding with a fan/heat sink?

If I add the fan, how do I power it?

How to even separate issues caused by EKP, fuel sensors and the LPFP?

Thanks!!
 

lituga

Lurker
Jul 3, 2020
10
2
0
A complete noob here trying to diagnose EKP issues in my 2016 F32 N55. The engine stalls intermittently and very randomly giving HPFP and insufficient fuel flow errors. I was advised this is likely due to overheating EKP. I have zero mods installed, so trying to understand if setting up active cooling will help with the issue.

Do EKPs go bad with time?

Should I just replace it instead of modding with a fan/heat sink?

If I add the fan, how do I power it?

How to even separate issues caused by EKP, fuel sensors and the LPFP?

Thanks!!
I'm no expert on the subject, but from your description I would be more likely to guess it's the HPFP itself.

I've never heard of the EKP overheating with no mods.
 

amerikanist

New Member
Feb 24, 2023
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I'm no expert on the subject, but from your description I would be more likely to guess it's the HPFP itself.

I've never heard of the EKP overheating with no mods.
That’s not what Dorchengineering folks are saying… my 435i shuts down its engine after prolonged climbs or highway rides. Then after clearing the errors, starts normally again after several minutes. Dorch folks are telling me not to change the HPFP as if it were failing I could not drive normally at all, which I can. They are pointing at LPFP or EKP, hence the question.
 

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