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1200s use a positive pressure Fuel Tank Cap that seals the Fuel Tank and lets no fumes out. This fuel tank cap is not pressure vented.
Contents |
Overview
All 1200s use a fuel tank cap without pressure relief. Pressure from the tank is relieved via the vent line.
Right: EVAPO type (vacuum relief type)
EVAPO means "Evaporative Emissions" - in other words, the gasoline fumes are not allowed to vent to the atmosphere, but only through the vent system. Australia utes from the 1980s are EVAPO, as are 1975 and newer 1200s in Japan market.
Non-EVAPO
The fuel filler cap is simple with a plain black rubber washer. has neither pressure venting nor vacuum relief. Venting takes place through a fuel loop hose connected to the tank. Fumes from the petrol tank go directly into the atmosphere. See Fuel Tank for details on the venting.
Datsun B10 part may or may not fit Datsun 1200
Part Numbers
17251-H1000 CAP-filler
17264-18000 PACKING-cap [the sealing washer]
17251-G1001 JDM CAP ASS'Y-filler B120 up to '73-2
* Same as JDM 620 up to '72-12
* JDM 620 from '75-1: 17251-B5000 also 610,710
Applied Model Codes * 180 Datsun 1000 * H10 Datsun 1200 sedan * G10 Datsun 1200 truck * B50 Datsun 620 truck
EVAPO models
EVAPO (emission controlled) models were fitted to all USA 1200s and newer Sunny Truck.
NOTE: early models (1970) may have been fitted with a non-relief cap. It is recommended to fit a relief cap. |
The fuel filler cap should be sealed type. It does not let air out. But it does have a vacuum release valve to let air in. Perhaps it has the wrong cap. It should be more or less flat on the outside, with a nubbin on the inside.
Venting takes place with a vent line from the tank to the engine compartment, where it lets fumes into the crankcase to be 'stored' until the engine is started. Then the fumes are burned in the carburetor. See Emission Controls for details.
Newer models, starting with the 1973 B210, vent into a charcoal canister. But they use the same cap.
- flow guide valve goes in engine compartment
- Fuel tank filler cap
- The nubbin on the bottom is vacuum relief valve
Testing
For the EVAPO model:
- You should not be able to blow air out throw the cap
- You should be able to suck air in through the nubbin
- Wipe valve housing clean and place it in your mouth.
- Inhale air. A slight resistance indicates that the valve is in good mechanical condition. Note that, by further inhaling air, the resistance should disappear as the valve clicks.
- If valve is clogged, or if no resistance is felt, replace cap as an assembled unit.
Part Numbers
- 17264-18000 PACKING-cap [the sealing washer] $0.92
- 17251-H1000 CAP-filler 0570- Sedan, 0470- Coupe [non-EVAPO cap]
- 17251-H1900 CAP-filler 0672-
- 17251-H1901 CAP-filler 0672-
- 17251-H1902 CAP-filler, with packing 0173-
- 17251-U7402 CAP-filler $27.97
The replacement for all, including non-EVAPO cap is 17251-U7402
Interchange
For EVAPO models, the same gas cap is used for most Datsuns, from 1971 to early 1980s.
Pressure-Vacuum Type For Emission Control
- #16 / 671016 Atlas
- Stant #G-806
Fits:
- Datsun
- 720 Pickup 1980-1982
- 620 Pickup 1972-1979
- Stanza 1982
- F10 (F-10) 1982
- B110 1971-1973
- S10,S110 (200SX) 1977-1982
- B210 (B-210) 1973-1978
- B310 (210) 1979-1982
- 280Z 1977-1978
- N10 (310) 1979-1982
- A10 (510) 1978-1981
- 610 Wagon 1973-1976
- 710 Wagon 1977
- 810 (Maxima) 1977-1982
- AMC
- 1971, 1972, 1973, 1974 - Ambassador
- 1970 - Ambassador, California only
- 1978, 1979, 1980, 1981, 1982, 1983 - Concord
- 1980, 1981, 1982, 1983 - Eagle
- 1977, 1978 - Gremlin
- 1974, 1975, 1976, 1977 - Hornet
- 1978, 1979 - AMX, Javelin
- 1971, 1972, 1973, 1974 - AMX, Javelin
- 1970 - Javelin, California only
- 1971, 1972, 1973, 1974, 1975, 1976, 1977, 1978 - Matador
- 1977, 1978, 1979, 1980 - Pacer Station Wagon
- 1971 - Rebel
- 1970 - Rebel, California only
- 1979, 1980, 1981, 1982, 1983 - Spirit
- Buick
- 1970 - Station Wagons, California only
- Cadillac
- 1970 - California only
- Chevrolet
- 1970 - Full Size Station Wagons, California only
- 1970 - Camaro, California only
- 1970 - Chevelle & Malibu, California only
- 1970 - Chevy II & Nova, California only
- 1970 - El Camino, California only
- Chrysler
- 1977, 1978, 1979 - LeBaron, 2 Door
- 1976, 1977 - Full Size Station Wagons
- 1971 thru April - Imperial
- 1970 - Imperial, California only
- Dodge
- 1977, 1978 1979 - Diplomat, 2 Door
- 1976, 1977 - Royal Monaco Station Wagon
- 1971 thru April - Full Size, Coronet, Charger
- 1970 - Polara, Monaco, California only
- Ford
- 1970 - Fairlane Station Wagon, California only
- Plymouth
- 1976, 1977 - Gran Fury Station Wagon
- 1971 thru April - Fury, Belvedere,Satelite, Barracuda
- 1970 - Fury, California only
- 1970 - Belvedere, Satellite, except Station Wagon, California only
- Pontiac
- 1970 - Station Wagons, California only
- Renault
- 1982 - Fuego
- 1980, 1981, 1982 - 18I
- Subaru
- 1978, 1979, 1980, 1981, 1982
- Toyota
- 1978-1982 Celica
- 1976, 1977 Celica Liftback
- 1981 Starlet
- 1980-1982 Tercel
- 1980-1982 Corolla
- 1971-1974 Corolla Sedan
- 1970 - Corolla 1200
- 1979-1981 Corona Sedan, Liftback, Station Wagon
- 1972, 1973 Corona Hardtop, Sedan
- 1970, 1971 Corona
- 1973-1976 Corona MK II Sedan, Hardtop, Station Wagon
- 1969-1972 Corona MK II
- 1980-1982 Cressida
- 1978, 1979 Cressida Sedan
- 1971, 1972 Crown
- 1971-1983 Hilux Pickup, Sport Truck
- 1979 Land Cruiser
- 1981, 1982 Land Cruiser
- 1981, 1982 Starlet
B210
All Japan-market B210 used a sealed tank (EVAPO) system.
B210 JAPAN CAP ASSY-FILLER 17251-B5000 V 17251-H1902 S,K,V 17251-H1903 S,K from '73-9
B310
B310 JAPAN CAP ASSY-FILLER 17251-U8600 Van -7903 17251-B5000 S,K -7806 17251-U7402 S,K 7807-; V 7904-; W