Fuel tank
Datsun 1200 uses a 38 or 40 liter petrol (gasoline) tank.
Capacity
- #Sedan Tank: (40 liter, 10.5 US gal)
- #Coupe Tank: (38 liter, 10 US gal)
- Wagon Tank: (38 liter, 10 US gal)
- #Truck Tank ??
Mounting
Sedan tank is inside boot, just behind rear seat:
Coupe tank is underneath the car, under the boot area:
VB110 wagon tank
Truck tank
Gas Cap
Main: Fuel Cap
See also: Fuel Door
Fuel Sender
The fuel gauge level 'sender' is the sensor in the tank.
Main: 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.
Thus the return line prevents vapor lockᵂ (engine stalling and engine hot-starting issues).
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.
Van (wagon)
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
JDM
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:
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:
Straight one-piece filler hose for non-EVAPO system
The hose looks like this:
Filler Hose Comparo
Filler Modifications
Discussion: POSTNeed Fuel Tank!!
Drain Plug
The tank has a very useful drain plug. It is a special M12 bolt that uses a crush washer. Possibly a normal M12 with large washer and drain pan style washer can be used.
08931-44210 PLUG M12 thread hex head
* Datsun 1200 wagon, sedan, coupe, truck * Datsun 520 truck * Datsun 620 truck
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
Sedan Tank factory Baffling:
Coupe Tank
1200 Coupe fuel tank is below the trunk
Top side of tank has the Fuel Sender with vent tube
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/mildman/100_5192.jpg
Vent hose loop (end hangs free, vents to atmosphere)
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/mildman/100_5187.jpg
Fuel sender vents to filler hose
Vent hose loop
Fuel Outlet is on bottom half of tank
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/mildman/100_5235.jpg
Fuel Outlet goes back
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/mildman/100_5240.jpg 
US EVAPO
Cars that recover Evaporative fumes use the EVAPO system. The 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
Diagram
See also: Coupe Fuel Tank Part Numbers
Truck Tank
17251-G1001 CAP ASS'Y-filler 17251-H1901 CAP ASS'Y-filler EVAPO 1973
See also: Truck Fuel Tank Part Numbers
EVAPO
Reservoir tanklet was added March 1973 in Japan.
1978 in Australia.
https://i297.photobucket.com/albums/mm219/ddgonzal/sightings/forum/Ute_fuel_tank-reservoir-type.jpg 
See also: Part Numbers
1987 (昭和６２年１月)
Return line was added] October 1989 (see Truck_Fuel_Tank_Part_Numbers).
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/1971/Truck/C17-01.jpg
Late tank, 1989 October - 1994
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/Parts/B122_tank-a.jpg https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/Parts/B122_tank-b.jpg https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/Parts/B122_tank-c.jpg
TANK ASSY-RESERVE 17350-G1403, 17350-G1402
placed above main tank, up in the tray sidewall
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/reserve_tank.jpg http://i1193.photobucket.com/albums/aa342/torinokid/Ute095.jpg
https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/1409-2.jpg https://i297.photobucket.com/albums/mm219/ddgonzal/Datsun%201200/wiki/1409-1.jpg
B210
B210 Sedan Tank is similar to B110 Sedan tank
Compare to B110 SEDAN tank
B310
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.
Alloy Tanks
Coupe
Ute
Fuel Cell
See Main Article: Fuel cell
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