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Datsun 1200 uses a 38 or 40 liter petrol tank.

Capacity

Sedan: (40 liter, 10.5 US gal)
Coupe: (38 liter, 10 US gal)
Wagon: (38 liter, 10 US gal)

Mounting

Sedan tank is inside boot, just behind rear seat:
Album 3527 Album 13984 Album 5627

Coupe tank is undernearth car, under the boot area:
Album 3528 Album 2134

VB110 wagon tank
Album 3529

Truck tank
Album 19621

Gas Cap

Main: Fuel Cap

Fuel Sender

The fuel level 'sender' is the sensor in the tank.

See main article: Fuel Sender

Return Line

Starting in 1975, North American B210s were fitted with a fuel return line. Here's what the Nissan publication "Introduction of Datsun B210 (1975 model)" says:

Fuel return system
For preventing abnormal fuel temperature rise, the fuel return system has been installed. In this system, fuel from the fuel tank is delivered to both the carburetor and fuel tank.
The fuel return line services to return a part of the fuel to the fuel tank to suit different engine operating requirements, preventing the possibility of fuel heated flowing through the fuel line inside the engine compartment, and elminating "percolation" inside the carburetor.

Venting

Datsun 1200 in most parts of the world vents the fuel tank to the atmosphere. A simple hose loop goes from the filler tube up above the tank and back down towards the ground. The loop is to prevent a siphoning effect.
Album 3527 Album 3528 Album 3529 Post 487378

Van (wagon)
Post 378698

EVAPO

In Australia after 1978, and Japan after 1974, and all years in North America 1200s used the Evaporative emissions control system.

With EVAPO, the tank is not vented directly to the air. Instead, fumes are captured by the Evaporate Emission control (EVAPO) system. For details, see Fume Control.

Filler Hose

Coupe

USA B110 coupe tank
Album 18602 Album 18603 Album 18604 Album 18605

JDM
Album 16615

Sedan

Note that the USA B110 sedan tank uses a 2-piece filler hose (there's a small hose inside the bigger one). This is for the EVAPO (emissions market) vehicles:

Album 9715
Two-piece curved filler hose for EVAPO system

This hose is NLA (No Longer Available) in US, Canada or Japan. However, the regular single hose can be fitted as follows:

Album 9716
Straight one-piece filler hose for non-EVAPO system

The hose looks like this:
Album 9717
Filler Hose Comparo

Album 9718 Album 9719 Album 9720
Filler Modifications

Discussion: Need Fuel Tank!!

Sedan Tank

* Early: ventless (vents through filler hose)
up to chassis number B110-145650, B110-600010
17201-H1000 ASS'Y-TANK, fuel
17201-H1001 ASS'Y-TANK, fuel (with baffle plate) > 17201-H100

* Revised: two tank vents
All PB110 sedan
B110 from chassis number B110-145651, B110-600011
* Fuel Sender updated at same time
17201-H1902 ASS'Y-TANK, fuel
17201-H2800 ASS'Y-TANK, fuel > 17201-H1902

17201-H2800 vented tank
Post 488733 Post 488733 Post 488733 Post 488733Post 488733

Sedan Tank factory Baffling:
Album 12328

Album 3527 Album 13984 Album 5627

Coupe Tank

Album 25547 Album 22649

Vent hose loop
Album 22648

Vent hose loop (end hangs free, vents to atmosphere)

Fuel sender vents to filler hose

Fuel Outlet is on bottom half of tank

Fuel Outlet goes back

US EVAPO

Expansion Tank is a liquid/vapor separator. This was replaced by a check valve in the B210 sedan, while B210 coupe continued to use the separator tank. In the B310 this tank was removed and all models used the check valve.

17350-H1801 ASSY-TANK RESERVOIR
17350-H1802 ASSY-TANK RESERVOIR

Album 20427

Album 22647

Diagram
Album 20428
See Coupe Fuel Tank Part Numbers

Truck Tank

17251-G1001 CAP ASS'Y-filler
17251-H1901 CAP ASS'Y-filler EVAPO 1973

EVAPO

Reservoir tanklet was added March 1973 in Japan.

1978 in Australia.
Album 24465
Part Numbers

1987 (昭和６２年１月)
Post 492942 Post 492942 Post 492942

Return line was added October 1989.

Late tank, 1989 October - 1994

TANK ASSY-RESERVE 17350-G1403, 17350-G1402
* placed above main tank, up in the tray sidewall
Album 25589

Album 13878

B210

B210 Sedan Tank is similar to B110 Sedan tank
Post 283008 Post 283008

Compare to B110 SEDAN tank
Album 3527

B310

Album 10691

Parts Sources

Nissan. In North America, call Ericksen Nissan's toll-free number. If Ericksen says they can't get a part let us know (click "Edit" and add it to this article). Also, if they do get the part for you, let us know that too!
- NOTE: Nissan USA is out of stock forever of the Sedan hose. But perhaps they can get the Coupe hose.
Wreckers, if you can find a 1200 in a wrecking yard
Friends with parts cars
Marine supply stores, for general fuel hose and filler hose. NAPA and other old-line auto parts store carry this generic fuel-rated hose also. Trimmed to length using the old filler hose as a guide. It is tough getting it to flex into shape, but can be done.