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Precision Raceworks

BMW E9x / E8x Fuel Pump Expansion Modules

(6)
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€449,99 EUR inc. VAT
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Upgrade modules for drivers who already run a Precision Raceworks Stage 2 or 2.5 bucketed pump and want more fuel for bigger power on any blend up to 100% E85. Each module adds a second Walbro pump to your existing PR kit, with all the hardware and wiring needed. Note: an existing PR Stage 2 or 2.5 pump is required, and to reach the rated figures, the Precision Raceworks in-tank filter regulator assembly is needed.

Stage 3 module — adds a Walbro 450 (1.5 GPM / 5.65 LPM)
Supports up to 1000 whp (875 whp on 100% E85).

Stage 3.5 module — adds a Walbro 525 (1.69 GPM / 6.4 LPM)
Supports up to 1100 whp (950 whp on 100% E85).

Both are fully E85-compatible and need no tuning. The module is designed for home assembly, so you never send your fuel pump housing away and it stays in the exact condition it came out of the car in.

Bucket vs bucketless: a bucketless pump flows about 0.2 GPM more, but should not be run below a quarter tank or used for road-course racing. If that suits your driving, it can be a cheaper option.

Fits (E8x / E9x, 2006-2015):

Model Years
1 Series M 2011
128i 2008-2013
135i 2008-2013
135is 2013
323i 2007-2011
325i / 325xi 2006
328i 2007-2013
328xi 2007-2008
328i xDrive 2009-2013
330i / 330xi 2006
335i 2007-2013
335xi 2007-2008
335i xDrive 2009-2011
335is 2011-2013
X1 2012-2015

Available on request.
Estimated EU delivery: 7–14 business days.
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FAQ

What do fuel pump expansion modules actually do?
They expand fuel delivery capacity beyond what the standard setup provides. This supports builds that demand more fuel than the factory system supplies.
Do they add a second pump or boost the existing one?
Depending on the design, they can add pumping capacity or drive the existing pump harder. Check the listing so you know how this module expands supply.
Do they need wiring into the fuel system and power?
An expansion module ties into the fuel and electrical systems to work. Confirm the connections and power it needs before fitting.
Are they specific to the E9x/E8x setup?
They are built around the E9x and E8x fuel system layout. Confirm your exact car before ordering.
Why would a build need expansion modules?
High-power or ethanol-heavy builds can outrun the standard fuel supply. Expansion modules add the headroom those setups need.
Do they require a tune to manage the extra capacity?
The added capacity is only useful when the tune is set up to use it. Plan the software alongside the modules.

Customer Reviews

6 reviews

Niels H.

Added these expansion modules to my E90 to give the fuel system more headroom for my build, and they've done exactly that, no more hitting the pump's ceiling. Plugged in neatly

Fredrik K.

Great way to add fuel capacity without a full swap, works a treat

Tarek C.

Took a touch longer to arrive than expected, though they were well packaged and complete

Fedir D.

Went this route on my E82 because I wanted more fuelling for a bigger turbo without ripping the whole system out. Modules slotted in cleanly and the extra headroom is there when I need it

Niklaus C.

Tuner wired them in and said they were a tidy solution for the E9x platform, no bodging required. Fuelling is sorted for my power goals now

Aloys L.

Smart bit of kit if you're pushing an E8x or E9x past what the stock pump can give, did the job without a headache. Solid and reliable so far