Genuine Weber Brass Float | 48 IDA & 40/46 IDA 3C Carburetors | Porsche 911 & VW Type 1–4 (41015.007)
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Weber 41015.007 is the genuine soldered-brass fuel-level float for Weber 48 IDA (2-barrel) and 40/46 IDA 3C (3-barrel) downdraft carburetors, factory Weber stock supplied through REDLINE and shipped from California. A 48 IDA takes one float, a 3-barrel IDA takes two, and a Porsche 911 needs four. Sold single, as a 2-pack or as a 4-pack.
Part numbers: Weber 41015.007 · 41015.007B (brass) · 41015007 · WEB-41015-007 · PMO PM-O165-0 (PMO165) · item 15 in the Weber IDA exploded view
How many floats do I need?
| Carburetor | Floats required |
|---|---|
| Weber 48 IDA (2-barrel) | 1 per carburetor |
| Weber 40 IDA 3C / 46 IDA 3C (3-barrel) | 2 per carburetor |
| Porsche 911 — matched pair of 3-barrel carbs | 4 total |
| VW Type 1 — dual 48 IDA setup | 2 total |
Fitment
| Years | Vehicle | Notes |
|---|---|---|
| 1966–1972 | Porsche 911 | Factory Weber 40 IDA 3C induction (roughly February 1966 through 1972): 4 floats |
| Any year | VW Beetle, Super Beetle, Karmann Ghia, Bus, Type 3, Type 4, Thing and buggies | Dual 48 IDA setups: 2 floats |
| Any year | Porsche 356 and 912 | 48 IDA performance conversions |
| Any year | Small-block Ford and other V8 induction | 4x 48 IDA setups |
| Any year | Mazda rotary 12A and 13B | 48 IDA downdrafts |
| — | EMPI EPC 48 and other IDA-style clones | Does not fit: they use their own float part numbers |
This part fits the carburetor, not the car. Weber's parts breakdowns also list this float across the wider 3-barrel family: IDA, IDAP, IDL, IDTP, IDS, IDT and IF series. Confirm the model stamped on your carburetor body and count your float chambers before ordering.
Specifications
| Spec | Detail |
|---|---|
| Weber part number | 41015.007 (supplied as 41015.007B, brass) |
| Also catalogued as | PMO PM-O165-0, the same float under a different supplier's number |
| Exploded-view reference | Item 15, Weber IDA parts breakdown |
| Material | Brass, soldered disc body with a saddle channel and integral pivot tang |
| Brand | Weber, via REDLINE (authorized North American distributor) |
| Condition | New |
| Sold as | Single float, set of 2 (one 3-barrel carb) or set of 4 (Porsche 911 full set) |
| Companion part | IDA needle valve: Weber 79504 series (48 IDA commonly 2.00 mm, part 79504.200) |
Float level reference
Published Weber IDA float-leveling figures, measured with the top cover held vertical and the float resting lightly on the closed needle valve:
| Carburetor | Closed (dimension A) | Float drop |
|---|---|---|
| 40 & 46 IDA 3C (3-barrel) | 18 mm | 12.5–13 mm |
| 48 IDA (2-barrel) | 24 mm | 5.5–6 mm |
Float level specifications vary by application, so always confirm against the calibration for your specific carburetor before final assembly.
What's Included
- Brass float(s) only: single, set of 2 or set of 4, per the option you select
Not Included
- Needle valve (Weber 79504 series)
- Top-cover gasket
Why It Matters
Brass floats have quietly become the hard part of an IDA rebuild. Most of what is offered today is either the later plastic (Spansil) float that replaced brass in Spanish production, or an aftermarket brass copy made outside the Weber supply chain, and the genuine brass floats that do surface are typically overseas listings. This one ships from the United States.
A matched float and needle valve are what hold a stable fuel level; a mismatched float is the usual cause of flooding or high-rpm starvation.
Installation Notes
- 3-barrel carburetors: to run this float in a 40 or 46 IDA 3C, the stop tab must be removed. In a 48 IDA it fits as supplied.
- Never mix brass and plastic floats within one carburetor or one matched set. The two materials do not weigh the same, so the fuel levels will not match and the carburetors cannot be balanced.
- Adjust at the tang, not the arm. Bend the tabs until they sit perpendicular to the pivot axis, and inspect the tang face for indentations that can bind the needle.
- Replace the needle valve and the top-cover gasket at the same time. A new float against a worn needle will not hold a level.
Frequently Asked Questions
Is the Weber 41015.007 brass float a genuine Weber part?
Yes. Weber part number 41015.007, supplied through REDLINE, the authorized North American Weber distributor. It is not an aftermarket copy.
How many floats does my Weber IDA carburetor take?
A Weber 48 IDA (2-barrel) uses one float. A Weber 40 IDA 3C or 46 IDA 3C (3-barrel) uses two floats per carburetor, so a Porsche 911 running a matched pair needs four and a dual 48 IDA VW needs two.
Is this the same float as PMO PM-O165-0?
Yes. Same float, different supplier's part number. If you have been quoted or shipped PM-O165-0, this is that part.
Does this float fit the 40 IDA 3C as supplied?
Not quite. To run this float in a 40 or 46 IDA 3C three-barrel carburetor, the stop tab must be removed. In a 48 IDA two-barrel it fits as supplied.
Can I mix brass and plastic Weber floats?
No. Weber later introduced a plastic (Spansil) float under the same base part number, and the two do not weigh the same, so never mix the two materials within one carburetor set.
Does it include a needle valve or gasket?
No, float only. The IDA needle valve is Weber's 79504 series; the 48 IDA commonly uses the 2.00 mm valve, part 79504.200.
⚠️ California Proposition 65 Warning: This product can expose you to chemicals including lead, known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.
