Piaggio 858506 Complete Fuel Pump – Carnaby 250/300 and Aprilia Sport City 250/300

The Piaggio 858506 fuel pump is the complete pump assembly that works submerged in the tank of 250 and 300 electronic injection scooters from the Piaggio-Aprilia group. Its official catalog name is "FUEL PUMP" and it appears on diagrams under the heading "Fuel tank". It is intended for the Piaggio Carnaby 250 4T ie and Carnaby 300 4T ie Cruiser, and for the Aprilia Sport City Cube 250-300 and Sport City Street 300. It is not just the pump itself: it is the complete assembly with filter, wiring, and support. Part number 858506, new original spare part.

✓ Key features

• Complete assembly, not just the motor – the package includes the pump body, filter cartridge, wiring, and support, pre-assembled (determined from the product photograph).
• Original Piaggio spare part – there are many equivalents for this part number circulating, as well as many refurbished units or units salvaged from vehicles: here you will find the new part with the manufacturer's part number.
• One part number for two brands – the same assembly covers the Piaggio Carnaby and the Aprilia Sport City of the same generation.
• Integrated fuel filter – the filter cartridge is part of the assembly, so replacing the pump also renews the filtration (determined from the photograph).
• Sealing gasket on the fitting – the black ring is already in place on the outlet (determined from the photograph).

Technical specifications

* data determined from the product photograph, not stated in the Piaggio catalog.
** indicative value: weight is not stated in the catalog or by dealers.

Vehicle compatibility

Your scooter is not in the list but your mechanic indicated this part number? Contact us for further information: we will check the assignment using the chassis number before you order.

Who is it perfect for?

It is the spare part for anyone who has a Carnaby or a Sport City that won't start, starts intermittently, or shuts off while riding and has already checked the relay, fuse, and spark plug. On these scooters, the submerged pump is a typical failure after a few years, especially if the tank has often been kept in reserve. It is ideal for the repair shop that wants to complete the job in one go – the pump, filter, and wiring arrive together – and for anyone keeping a modern classic scooter on the road who prefers a new part over a refurbished pump of uncertain origin.

Frequently Asked Questions

How do I know if my Carnaby's fuel pump needs changing?
The clearest sign is the absence of the pump hum when you turn the key: if you don't hear it, the fuel is not being pressurized. Other symptoms include long start times, power gaps during acceleration, and sudden engine cutouts. Before replacing it, it is advisable to check the fuse, relay, and connector, which cause the same symptoms.

Does the supply include the filter?
Yes. The 858506 is the complete assembly: the pump body, filter cartridge, wiring, and support arrive already assembled. You don't need to buy the filter separately or transfer parts from the old assembly: you replace the whole unit and the filtration is renewed along with the pump.

Is the same part number good for both Piaggio and Aprilia?
Yes. Carnaby 250 and 300 Cruiser, Sport City Cube 250-300, and Sport City Street 300 belong to the same generation of Piaggio-Aprilia group 250-300 injection scooters and share the 858506 pump assembly, assigned to the "Fuel tank" diagram. The exact years are in the compatibility table.

Is it new or refurbished?
It is new and never installed, an original Piaggio spare part. The market for this part number is full of used pumps salvaged from vehicles and refurbished assemblies, which cost less but start with a part that has already been used. If you have any doubts about the difference, contact us for further information.