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Forced Induction Forum
Discuss supercharging, turbocharging and even nitrous and water injection here.

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Old 08-22-2013, 09:10 PM   #1
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Question E46 non M stock fuel lines max hp support

I am curious if the stock fuel lines with an in-tank aeromotive 340 pump will support a single turbo LS making in the neighborhood of 550 whp? What is the Max the stock lines can support?
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Old 08-23-2013, 09:52 AM   #2
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i think there is more to it than what the lines can support. i know to power the m3 fuel pumps there is an extra relay called the EKP fuel relay. this allows the car to give more power to the fuel pumps that the m3 pumps require to make 5 bar. non-m cars dont have the EKP relay
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Old 08-23-2013, 03:36 PM   #3
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The EKP fuel pump relay only exist in the US E46 M3's. They are missing in the the euro E46 M3's. That relay is just a speed controller for the fuel pump. I believe bimmerguy055 is running a walbro 255hp in his turbo setup and is making 500hp on his boosted e46.
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Old 09-16-2013, 01:16 PM   #4
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if you install an aeromotive pump using their wiring recommendations, you will be installing a 40A relay and 10G wire to provide sufficient current for the pump.
As for the original question, I had 550HP on my M5 using stock fuel lines. This works fine but I'd prefer to upgrade all lines, fuel rail and fuel filter/regulator.
Same applies to my E46 non M

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