A Deep Dive Into OneFastShop's CNC Billet Fuel Pump Bracket for 39mm Pumps
Seven millimeters decides this purchase. A Walbro 450 measures 39mm across its main housing and a DeatschWerks DW400 measures 46mm, so a 39mm fuel pump bracket that grips the first one perfectly will not even start onto the second.
This page decides whether our CNC billet 39mm bracket belongs in your fuel system build, or whether a complete pump assembly, a ready made surge hanger or a different bracket is the smarter buy. It is our own part, so we hold it to the same standard as anything else we sell, and we say plainly what it does not do.
Specs, fitment and price come from our product listing. Pump dimensions come from TI Automotive (the company behind Walbro) and DeatschWerks, and rival prices come from each maker's own site. Prices vary by dealer.
The Short Answer
Our CNC billet 39mm fuel pump bracket (OFSFPB, $99.99) locks one 39mm body in-tank pump inside a custom hanger, surge tank or fuel cell with a set screw, a stainless plate and two rivets. It fits the Walbro 450, 525 and 535, Walbro 255 and 350 GSS pumps and DW200 to DW420. It does not fit the 46mm DW400 or DW440.
| At a glance | OneFastShop 39mm billet bracket |
|---|---|
| Cost | $99.99, pump not included |
| Install time | Minutes to clamp the pump; most of the time goes into drilling and riveting your hanger (our estimate) |
| Difficulty | 3 of 5, light fabrication |
| Tools needed | Drill, rivet tool, driver for the set screw, deburring tool |
| Gain | No power on its own; it keeps the pump from slipping or rotating |
| Best for | DIY buckets, surge tanks, fuel cells, dual pump builds |
What the 39mm Fuel Pump Bracket Does, and What It Doesn't
The 39mm fuel pump bracket does one job: it holds a single 39mm body pump rigidly in place so it cannot slide down, twist or buzz loose inside the tank. A pump that rotates or drops can pull its pickup out of fuel, stress its hose and wiring, and cause pressure drops that look like a dozen other faults.
Here is the limitation up front. This is a clamp, not a hanger. It has no strainer, jet pump, return routing, wiring pass through or top hat, so it only makes sense when you build the rest of the assembly yourself.
A builder on SpoolStreet made the same point: aftermarket brackets do not carry the clips that hold the return lines, which on a BMW bucket help keep it full. Plan that fill path separately.
Which Pumps Fit: the 39mm Rule
Any in-tank pump with a 39mm main body fits our bracket, and any pump that is wider does not, no matter how hard you push. The table lists what our listing confirms, plus the common pumps that will not fit.
| Pump | Part numbers | Body | Fits our bracket | Price |
|---|---|---|---|---|
| Walbro 450 E85 | F90000267 | 39mm / 50mm | Yes | $115.14 (our store) |
| Walbro 450 high pressure | F90000274 | 39mm / 50mm | Yes | $122.37 (our store) |
| Walbro 525 Hellcat | F90000285 | 39mm / 50mm | Yes | $150.70 (our store) |
| Walbro 535 Hellcat Plus | F90000295 | 39mm / 50mm | Yes | $166.20 (our store) |
| Walbro 255 / 350 | GSS340 to 342, GSS350G3 to 352G3 | 39mm | Yes | $69.28 / $92.04 (our store) |
| DeatschWerks DW200 / DW300 / DW420 | 9-201, 9-301, 9-421 | 39mm | Yes | $109 / $169 / $199 (DW list) |
| DeatschWerks DW340v | 9-354, 9-355 | Per our listing | Yes | $249 (DW list) |
| DeatschWerks DW400 / DW440 | 9-401, 9-441, 9-442 | 46mm | No | $239 (DW400 universal, DW list) |
| Bosch 044 | Inline | 60mm | No | Not applicable |
| Walbro F2000169 | Inline | Not 39mm | No | Not applicable |
The Walbro 39/50 family needs one extra note. TI Automotive's F90000285 spec sheet lists a 131mm pump with a 39mm main housing and a 50mm lower housing, and the 450 and 535 share that layout. The bracket clamps the 39mm section, so it slides on from the outlet end and stops above the wider base.
DeatschWerks confirms the other half. Its universal install guide covers the DW100, DW200, DW300 and DW420 as "standard 39mm OD" pumps, while its own DW400 announcement calls that pump 7mm wider than the standard 39mm. If you are still choosing a pump, our Walbro 450 vs 535 vs DW400 comparison lays out flow and current draw at 40 to 100 psi.
How the Bracket Holds the Pump
The bracket locks the pump with a set screw that pinches a split billet ring around the pump body, so the pump cannot slip down or rotate. Rotation is the failure a simple cradle or a hose clamp alone does not stop.
- Bracket: CNC machined billet 6061 aluminum, black anodized for corrosion and wear resistance.
- Locking: integrated set screw across the split ring.
- Mounting: stainless steel plate for rigidity, plus two aluminum rivets for a permanent install in your hanger or surge tank.
- In the box: one bracket, one stainless plate, one set screw, two rivets. Pump not included.
The rivets are the commitment point. Moving a riveted plate means drilling the rivets out, so mock up pump height, strainer clearance and hose routing first. Drill and rivet with the hanger out of the tank, drained and dry, and when you open the tank, run it to a quarter or less, work somewhere ventilated and away from sparks, and disconnect the battery first.
Bracket, Hanger or Complete Kit: Your Real Options
A bare 39mm fuel pump bracket is the cheapest way to mount a pump, but a direct fit hanger or a complete assembly often costs less once you count your time and the parts you would otherwise source. These are the real options, priced from each maker's own site.
| Option | What it is | Fits | Maker's price |
|---|---|---|---|
| OneFastShop OFSFPB | Billet clamp, stainless plate, rivets | Any 39mm body pump | $99.99 |
| 034Motorsport 034-106-6001 | Billet drop-in adapter for the factory basket | 39mm pumps in listed Audi B3 to B6, C4 and C5 models | $116 |
| Radium FCST-X lift pump mounts 20-1212 / 1213 / 1214 | Stainless pump mounts | 39mm OD pumps in Radium fuel cells | $29.95 to $49.95 |
| Radium FHST-RA 20-1972 | Complete fuel hanger surge tank, pumps not included | E90, E91, E92, E93 with F90000267, 274 or 285; not 1 Series | $569.95 |
| DeatschWerks 6-000-30ST | 3.0L staged surge tank without pumps | DeatschWerks pumps | $449 ($729 with dual DW420) |
| Generic eBay and Amazon clamps | Unbranded stamped or machined rings | Varies by seller | No maker list price |
Radium and DeatschWerks sell no standalone 39mm clamp for custom work; their mounts belong to their own cells, tanks and hangers. The 034Motorsport adapter is shaped for specific Audi baskets. Generic clamps can work, but we could not verify the material or tolerances of any single listing.
Where It Fits by Car and Build
The bracket is universal, so fitment depends on your pump and your container, not your VIN.
| Car or build | Years | Engine | Better path | Rough cost |
|---|---|---|---|---|
| E82/E88 135i, E90/E92/E93 335i, single pump | 2007 to 2013 | N54, N55 | Our complete Stage 2 LPFP kit, no bracket needed | $370 |
| Same cars, dual pump | 2007 to 2013 | N54, N55 | Our Stage 3 dual Walbro 450 kit | $710 |
| E90 to E93 track car with slosh issues | 2007 to 2013 | N54, N55 | Radium FHST-RA surge hanger | $569.95 plus pumps |
| DIY bucket or fabricated hanger | Any | Any | This bracket, one per 39mm pump | $99.99 each |
| Surge tank or fuel cell build | Any | Any | This bracket if the tank has no pump mounts | $99.99 each |
| Any DW400 or DW440 build | Any | Any | A hanger or module built for the 46mm pump | Varies by hanger |
What Owners Actually Say
Owners who skipped a proper pump mount describe the same symptoms, and owners who built one carefully report steady pressure. We found no forum reports on our own bracket yet, so these cover 39mm pump mounting in general.
The fill-up stumble. An E92 335i owner on Bimmerpost ran a DIY Walbro 450 E85 in the stock bucket. It behaved at half a tank, stumbled on every start after a fill-up, and finally would not start at all on a full tank. With the pump out, he drilled the bucket and zip-tied the pump bracket to it at every contact point, and the car fired right up.
A Toyota Supra owner on Supramania fitted a Walbro GSS341 and found close to an inch of gap between the pump and the factory bracket. The forum's advice was that the hose would hold it; he added a bracket instead. Another owner cushioned his pump with spare fuel hose and a worm clamp and said he only hears it at startup and shutdown.
On SpoolStreet, an N54 owner built dual Walbro 450s into a modified stock bucket with an adapter holding both pumps, for about $775 all in. He reported no added pump noise, no low pressure fall-off on E85, and no starvation even after running to the low fuel warning.
The mixed result came from an E89 Z4 owner on SpoolStreet who moved to a Walbro F90000295. His original pump hose was too tight and had hardened, so he replaced it with ethanol resistant hose, and the car cranks a little longer if he does not prime it first. In the Bimmerpost thread, a 135i owner warned that DIY hose with 90 degree unions sees pressure spikes, and shared a photo of a submersible hose that failed just before a restriction.
Mistakes We See
- Buying for a DW400. The DW400 and DW440 are 46mm. Check the body diameter on the pump maker's spec sheet before you order.
- Trusting the hose to hold the pump. A hose locates the outlet; it does not stop the pump rocking or rotating.
- Leaving the bracket floating. A clamped pump on a loose bracket is still a loose pump, as the Bimmerpost E92 showed.
- Riveting before mock-up. Rivets are hard to undo; test fit everything first.
- Cheap outlet hose. Use submersible, ethanol rated hose or a quick connect fitting, and avoid stacking 90 degree unions.
- Adding a second pump without a plan. Our E-chassis kit listings warn that a weak EKP2 module can overheat with upgraded pumps, and the second pump needs its own trigger.
Who This Is For (and Who Should Skip It)
The bracket is for people fabricating their own pump mount: a cut-down bucket, a custom hanger, a surge tank or a fuel cell with no pump mounts of its own. It suits dual pump builders, since each 39mm pump gets its own locked mount.
Skip it if you drive an E-chassis N54 or N55 and want more fuel without fabrication, because a complete assembly costs less than sourcing a bucket, pump, bracket and fittings. Skip it if your pump is a DW400, DW440 or Bosch 044. Skip it if your chassis has a direct fit hanger you would rather bolt in, such as the Radium FHST-RA for the E90 to E93.
If It Were Our Car
- E-chassis 135i or 335i, one pump: our Stage 2 kit at $370, which we rate to 575 whp on pump gas. No bracket.
- Same car, two pumps: our N54 Stage 3 dual Walbro 450 kit at $710, with the Hobbs switch and harnesses included.
- Custom surge tank or fuel cell: one bracket per pump, Walbro F90000274 or DW420, plus outlet fittings that match the pump.
- DW400 build: a 46mm mount. This bracket cannot help.
For the full E-chassis lineup and what each stage supports, see our N54 LPFP upgrade guide.
What It Pairs With
The bracket handles the pump body; the outlet needs its own solution. For the Walbro 39/50 family (F90000267, 274, 285 and 295), our single outlet fitting ($28.99) turns the barbed outlet into a 7.89mm (5/16 inch) male quick connect with a Viton O-ring. The dual outlet fitting ($54.99) and the Y-line ($29.99) combine two pumps into one feed.
Those fittings do not fit DeatschWerks or Walbro GSS pumps, even though the bracket does, so DW420 builds still need hose and clamps on the outlet. Our 7.89mm quick connect fittings guide covers both setups, and our secondary fuel pump wiring guide covers the trigger for pump two. Pumps live in our fuel pump collection.
We are an authorized dealer for every brand we carry, and in stock hardware ships fast. The bracket carries our 1 year house brand warranty. It ships free to any US address, and we ship worldwide with shipping calculated at checkout.
The Bottom Line
Our 39mm billet bracket is a $99.99 answer to one problem: a 39mm in-tank pump that will not stay put. It locks Walbro and DeatschWerks DW200 to DW420 pumps with a set screw and a riveted stainless plate. It does nothing for a 46mm DW400 and does not replace a hanger's strainer, jet pump or return routing. If you own an E-chassis N54 or N55 and do not want to fabricate, a complete kit is the better buy. If you are building the hanger yourself, this is the piece that stops the fill-up stumble the Bimmerpost owner chased.
Frequently Asked Questions
Does the OneFastShop 39mm bracket fit a DeatschWerks DW400?
No. The DW400 has a 46mm body, 7mm wider than the 39mm bore, and the DW440 is the same story. For a DW400, use a hanger or module built for 46mm pumps, such as the DeatschWerks DW400 hangers and modules.
Which pumps fit a 39mm fuel pump bracket?
Our listing confirms the Walbro 450 (F90000267, F90000274), 525 (F90000285), 535 (F90000295), Walbro 255 (GSS340, GSS341, GSS342), Walbro 350 (GSS350G3 to GSS352G3), and DeatschWerks DW200, DW300, DW340v and DW420.
Does it fit the Walbro 535 if the pump is 50mm at the bottom?
Yes. TI Automotive lists the 450, 525 and 535 as 39mm main housing with a 50mm lower housing, and the bracket clamps the 39mm section. The 50mm end cannot pass through the 39mm ring, so the bracket goes on from the outlet end.
Is the fuel pump included with the bracket?
No. The kit is the billet bracket, a stainless steel mounting plate, a set screw and two aluminum rivets. The pump, strainer, wiring and fuel hose are bought separately.
Do I need this bracket if I buy a OneFastShop LPFP kit?
No. Our E-chassis N54 and N55 LPFP kits ship as complete bucket assemblies with the pumps already installed. The bracket is for people building their own hanger, bucket or surge tank.
Can I run two pumps with two brackets?
Yes. Each bracket holds one pump, so a dual pump build uses two. Combine the outlets with our dual outlet fitting or Y-line, and plan the second pump's trigger and wiring before you seal the tank.
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