Piaggio 1386172 Fuel Tank with Cap – Vespa 50 S, 50 Special, 125 Primavera and ET3

The Piaggio 1386172 fuel tank is the black painted steel sheet metal tank for Vespa small frame models: 50 S, 50 Special, 125 Primavera and ET3. It is an original Piaggio spare part and comes with the cap already fitted (as observed from product photographs). On a vintage Vespa, the fuel tank is the first part to rust: it sits under the seat, collects moisture from both inside and out, and when it starts releasing rust, it repeatedly clogs the tap, filter, and carburetor.

✓ Strengths

• Original Piaggio spare part, catalog code 1386172 — same dimensions, same mounting points, and same bottom shape as the original equipment part
• Cap already fitted: you don't have to retrieve the old one or buy it separately (as observed from product photographs)
• Painted black, inside and out: not raw sheet metal that needs treatment before mounting (as observed from product photographs)
• Two longitudinal ribs stamped on the upper surface, just like the original: they stiffen the sheet metal and are a detail visible when the seat is raised (as observed from product photographs)
• Mounting holes at the corners already pre-drilled and a shaped bottom to fit over the frame: mounts without adaptations (as observed from product photographs)
• Resolves at the root a problem that no additive truly solves: an internally rusted tank continues to dirty the system even after cleaning

Technical Features

Characteristics indicated as observed from photographs are derived from direct examination of the item in stock. Catalog data may be updated by Piaggio without prior notice.

Vehicle Compatibility

Compatibility list from official Piaggio spare parts catalog. If your frame number is not in the table, contact us for more information before ordering: we will verify it on the catalog for you.

Replacing the fuel tank is one of those jobs you put off until your Vespa breaks down for the third time with a clogged jet. A new tank solves the problem once and for all, instead of fighting it with washes and additives. We ship within 24/48 hours from Cercola, packaged for a part weighing almost three kilos. If you have doubts about your frame number or also need the tap, contact us for more information.

Who it's perfect for

• Anyone with an internally rusted tank who finds their carburetor dirty every two rides
• Anyone with a fuel leak from a weld or a corroded spot on the sheet metal
• Anyone restoring a Special, Primavera, or ET3 and wants to start with a healthy tank instead of repairing the old one
• Anyone who has tried washes, additives, and internal treatments, and the problem returned after a few months
• Workshops and restorers who need to guarantee the catalog code to the customer, not an adaptable tank

Frequently Asked Questions

Is the cap included?
Yes. The tank comes with the cap already fitted (as observed from product photographs). This is a real saving: buying the cap separately is an extra expense, and often the old one has a dry gasket.

What about the fuel tap?
It is not visible in the product photographs: consider it a separate spare part and do not count on it. Write to us with your frame number, and we'll tell you which tap is correct, so you can place a single order.

Is it better to restore the old one or buy a new one?
It depends on its condition. If the rust is superficial, an internal treatment may suffice. If the bottom is pitted or leaking, or if you've already treated it and the problem returned, a new tank is the only definitive solution: thinned sheet metal cannot be reversed.

Is it suitable for my Vespa 50 N, L, or R?
The table above is the official Piaggio catalog list for this code and includes 50 S, 50 Special, 125 Primavera, and ET3. Some retailers also associate the same tank with 50 N, L, R, and Vespa 90: contact us for more information with the number stamped on your frame, and we will confirm it before your order.

Is it already painted or does it need treatment before installation?
It comes already painted black. No treatment is needed: just install, connect, and fill. If the vehicle is parked for a long time, keep it full rather than empty — it's the humid air inside the tank that initiates rust, not the fuel.

How much does it weigh and how is it packaged?
It's a sheet metal part weighing almost three kilos, shipped in a box with edge protection. Upon delivery, check for dents on the upper surface: this is the area visible when the seat is raised.