Name: Genuine Tohatsu Fuel Tank Cap Assy 3GT-70321-0 | 4Boats
Brand: Tohatsu-AtB
SKU: 3GT-70321-0
Price: 45.11 GBP
Availability: InStock

Black pressure washer nozzle cap with a chain on a white background

Black cap with chain on a beige background

Black metal lamp holder with chain on a white background

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£45.11

Tax included.

Fuel Tank Cap Assembly

For the Tohatsu engine families listed in the Compatibility section

Keep your outboard's fuel system protected and functioning correctly with this Fuel Tank Cap Assembly. This part is specifically designed for the internal (integral) fuel tanks found on small portable engines. It provides an airtight seal when closed and features a manual breather vent to ensure consistent fuel flow during operation.

Key Features

✔ Manual Breather: Integrated vent screw prevents vacuum lock.
✔ Complete Assembly: Includes internal rubber sealing gasket.
✔ Precision Fit: Direct replacement for original factory caps.

Technical Specs

Part Number	3GT-70321-0
Vent Type	Manual Screw-Type
Application	Internal/Integral Fuel Tanks

Compatibility / Fitment Guide

Model	Power	Engine type
Tohatsu MFS2.5	2.5 HP	4-stroke
Tohatsu MFS4	4 HP	4-stroke

How to check before ordering: the part number on your old part should be 3GT-70321-0 (or a superseding number). If you are not sure, send us your engine model and serial number (on the plate on the engine bracket) and we will confirm fitment before you order. Tohatsu often uses the same part on related models, so this list may not be complete.

OEM Cross Reference

Manufacturer	Part Number
Tohatsu	3GT-70321-0

Questions & Answers

Which engines does this fit?

Tohatsu MFS2.5 and MFS4 (2.5 and 4 HP 4-stroke). To be sure, check the part number 3GT-70321-0 on your old part, or send us your engine model and serial number and we will confirm fitment.

How do I know if it is compatible?

We recommend checking the SKU/MPN and Cross Reference list provided above. This cap is specific to internal tanks; if your fuel tank is part of the engine itself, this is likely the correct part.

Do I need to leave the vent screw open while the engine is running?

Yes. You must partially unscrew the central vent knob during operation to allow air into the tank. This prevents a vacuum from forming, which would stop fuel flow and cause the engine to stall.

Note: Please verify your original part design against the references at 4boats.co.uk before purchasing.

For the products under £150 the shipping is £6.99.

Free delivery for most items over £150.

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Genuine Tohatsu Fuel Tank Cap Assy 3GT-70321-0 | 4Boats