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| - | [[Category:Fuel System]] | ||
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| The [[Fuel Shut-Off System]] was introduced in some 1980 B310 USA models. It leverages the [[anti-diesel valve]] to stop the fuel flow during periods of deceleration. This is similar to what EFI systems do. It is only active at higher speeds, namely above 40mph. | The [[Fuel Shut-Off System]] was introduced in some 1980 B310 USA models. It leverages the [[anti-diesel valve]] to stop the fuel flow during periods of deceleration. This is similar to what EFI systems do. It is only active at higher speeds, namely above 40mph. | ||
| Line 10: | Line 8: | ||
| For safety and good performance, the FSOS does not work unless the engine is decelerating. | For safety and good performance, the FSOS does not work unless the engine is decelerating. | ||
| - | |||
| * Only works when decelerating (vacuum is high AND speed above 40mph) | * Only works when decelerating (vacuum is high AND speed above 40mph) | ||
| - | * Does not work in nuetral, so engine will not stop due to lack of fuel | + | * Does not work in neutral, so engine will not stop due to lack of fuel |
| * Does not work when clutch is engaged (so you can blip the throttle) | * Does not work when clutch is engaged (so you can blip the throttle) | ||
| - | |||
| Components are: | Components are: | ||
| - | * Anti-diesel valve (solenoid) | + | * [[Anti-diesel valve]] (solenoid) |
| * Vacuum valve | * Vacuum valve | ||
| - | * Speedometer speed switch, amplifier and relay | + | * [[Speedometer#Amplifier_Speed_Switch|Speedometer speed switch amplifier]] and relay |
| ** Also used by CAL [[Mixture Ratio Rich-Lean Exchange System]] | ** Also used by CAL [[Mixture Ratio Rich-Lean Exchange System]] | ||
| - | * Automatic Transmission inhibitor switch | + | * Automatic Transmission [[Automatic_Transmission#Inhibitor_Switch|inhibitor switch]] |
| - | * Manual Transmission nuetral switch | + | * Manual Transmission [[Neutral Switch]] |
| * Clutch pedal switch | * Clutch pedal switch | ||
| This would be an interesting system to retrofit to older models for increased fuel economy. | This would be an interesting system to retrofit to older models for increased fuel economy. | ||
| + | |||
| + | Fuel Shut-Off System replaces Throttle Opener. | ||
| + | * Hitach DCH306-67 | ||
| + | * Dual-mode spark advance (intake vacuum works at idle, improving fuel economy) | ||
| + | * Double-lead anti-diesel valve | ||
| + | * 16767-H7280 UNIT-ENGINE REVOLUTION A14 FED(KFU) B310 [Engine Rev Switch, 1000-1150 RPM) | ||
| + | * 16024-H7281 THROTTLE SWITCH ASSY A14 FED(KFU) B310 [Throttle Valve Switch] | ||
| + | * 32130-H9011/32130-H9010 EXTENSION ASSY-REAR [unique, but others may work] | ||
| + | * 32006-K2401 SWITCH COMP-NEUTRAL COUPE 5-SPEED(CAL),FED KFU [Neutral Detecting Switch] replaced 32130-H9705 32006-K2400 | ||
| + | * 10mph switch in speedometer | ||
| + | |||
| + | = Coasting Cut-off = | ||
| + | Nissan intoduced a similar system for 1968 USA Datsun Pickup model [[520]]-TU. Call "coasting cut-off", it's main purpose was to reduce unburned hydrocarbons on decelleration. It is described in Nissan "Service Bulletin Vol. 79" | ||
| + | |||
| + | COASTING CUT-OFF PARTS | ||
| + | * Datsun [[520]]-TU from 1967 October (1968 model years + 1968-1969 521 with J13) | ||
| + | 16010-20610 Hitachi carburetor DCA306-4 | ||
| + | * with magnetic valve and accelerator switch | ||
| + | 16010-B0412 Hitachi DCA306-4A | ||
| + | 16010-B0412 Hitachi DCA306-4BK (ISO) | ||
| + | 16328-20600 Vacuum Switch (VS37-1) | ||
| + | |||
| + | "FUEL CUT OFF this vehicle is equipped with a fuel cut off to maintain emissions" | ||
| + | <br>1969 Datsun 521 LTU J13-equipped pictured | ||
| + | <br>Vacuum Switch is just below the gold sticker | ||
| + | <br>{{Photo!|DSC05027_zps67bb5dde-1.jpg|521%20pickup}} | ||
| + | |||
| + | The carburetor contains "Solenoid Valve (24D)" and a bolt-on micro-switch "Throttle Switch" and bracket. The solenoid looks like an [[Anti-diesel Valve]], but will be on a non-BCDD, non-auto choke carburetor. | ||
| + | |||
| + | micro-switch | ||
| + | <br>{{Photo|DCA306-4A_bx.jpg|521%20pickup}} {{Photo|J15_carb-c.jpg|521%20pickup}} | ||
| + | |||
| + | Fuel-cut Valve | ||
| + | <br>[need photo] is in same location as later Anti-diesel Valve | ||
| + | |||
| + | Not to be confused with "Coasting Air Solenoid Valve" (triangle base on Hitachi DAF328) | ||
| + | <br>{{Photo|J15_carb-b.jpg|521%20pickup}} | ||
| + | |||
| + | Not to be confused with Anti-diesel (Fuel-Cut) Valve (Hitachi DCH340): | ||
| + | <br>{{Photo|DCH340-1gx.jpg|521%20pickup}} | ||
| + | |||
| + | Not to be confused with a Boost Controlled Deceleration Device ([[BCDD]]) Valve: | ||
| + | <br>{{Photo|DCH340-1dx.jpg|521%20pickup}} {{Photo|DCH340-1ax.jpg|521%20pickup}} | ||
| + | <br>BCDD starting June 1971 for Datsun 510 USA (same time as auto choke) | ||
| + | |||
| + | Or B.C.D.D. with vacuum control valve | ||
| + | <br>{{Photo|DCH340_valves.jpg|521%20pickup}} | ||
| + | [[Category:Fuel System]]{{End}} | ||
Current revision
The Fuel Shut-Off System was introduced in some 1980 B310 USA models. It leverages the anti-diesel valve to stop the fuel flow during periods of deceleration. This is similar to what EFI systems do. It is only active at higher speeds, namely above 40mph.
1980: All California models 1980: FED A15.MT 1981 CAL, FED, FED.MPG and CAN.MPG models. Canada models did not use fuel-shut off except for MPG (FU Engine) models.
For safety and good performance, the FSOS does not work unless the engine is decelerating.
- Only works when decelerating (vacuum is high AND speed above 40mph)
- Does not work in neutral, so engine will not stop due to lack of fuel
- Does not work when clutch is engaged (so you can blip the throttle)
Components are:
- Anti-diesel valve (solenoid)
- Vacuum valve
- Speedometer speed switch amplifier and relay
- Also used by CAL Mixture Ratio Rich-Lean Exchange System
- Automatic Transmission inhibitor switch
- Manual Transmission Neutral Switch
- Clutch pedal switch
This would be an interesting system to retrofit to older models for increased fuel economy.
Fuel Shut-Off System replaces Throttle Opener.
- Hitach DCH306-67
- Dual-mode spark advance (intake vacuum works at idle, improving fuel economy)
- Double-lead anti-diesel valve
- 16767-H7280 UNIT-ENGINE REVOLUTION A14 FED(KFU) B310 [Engine Rev Switch, 1000-1150 RPM)
- 16024-H7281 THROTTLE SWITCH ASSY A14 FED(KFU) B310 [Throttle Valve Switch]
- 32130-H9011/32130-H9010 EXTENSION ASSY-REAR [unique, but others may work]
- 32006-K2401 SWITCH COMP-NEUTRAL COUPE 5-SPEED(CAL),FED KFU [Neutral Detecting Switch] replaced 32130-H9705 32006-K2400
- 10mph switch in speedometer
Coasting Cut-off
Nissan intoduced a similar system for 1968 USA Datsun Pickup model 520-TU. Call "coasting cut-off", it's main purpose was to reduce unburned hydrocarbons on decelleration. It is described in Nissan "Service Bulletin Vol. 79"
COASTING CUT-OFF PARTS * Datsun 520-TU from 1967 October (1968 model years + 1968-1969 521 with J13) 16010-20610 Hitachi carburetor DCA306-4 * with magnetic valve and accelerator switch 16010-B0412 Hitachi DCA306-4A 16010-B0412 Hitachi DCA306-4BK (ISO) 16328-20600 Vacuum Switch (VS37-1)
"FUEL CUT OFF this vehicle is equipped with a fuel cut off to maintain emissions"
1969 Datsun 521 LTU J13-equipped pictured
Vacuum Switch is just below the gold sticker
The carburetor contains "Solenoid Valve (24D)" and a bolt-on micro-switch "Throttle Switch" and bracket. The solenoid looks like an Anti-diesel Valve, but will be on a non-BCDD, non-auto choke carburetor.
micro-switch
Fuel-cut Valve
[need photo] is in same location as later Anti-diesel Valve
Not to be confused with "Coasting Air Solenoid Valve" (triangle base on Hitachi DAF328)
Not to be confused with Anti-diesel (Fuel-Cut) Valve (Hitachi DCH340):
Not to be confused with a Boost Controlled Deceleration Device (BCDD) Valve:
BCDD starting June 1971 for Datsun 510 USA (same time as auto choke)
Or B.C.D.D. with vacuum control valve
