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Factory Fuel Pressure Regulator, 84-89 300ZX
You can choose a Z-Car from your garage, or from the selections above, to filter the store or check part fitment.
Part #:11-3422
Price: $78.08
Includes:
Description:
The fuel pressure regulator has a simple task: maintain proper fuel pressure relative to engine speed when the car is running. Earlier Z-Car regulators are vacuum operated, which essentially allows the engine itself to adjust and maintain fuel pressure based on engine speed. Vacuum operated regulators can fail in a variety of ways, leading to different symptoms depending on the specific situation.
If your engine is running rich, it could be that the fuel return side of the regulator is clogged or damaged, resulting in higher pressure at the injectors. A regulator that is stuck in the closed position will also cause a rich condition in a similar way. The diaphragm can also rupture, leading to fuel being drawn through the vacuum line to the intake manifold. If the engine is running rich enough, you may see black, sooty smoke along with the exhaust. On the other side, you may run into a lean condition if the regulator is stuck open or damaged internally. This can show up as hard starting or stumbling at certain engine speeds.
As a critical component to engine operation, the regulator should be inspected or tested if symptoms appear, then replaced if needed. This is the genuine, original equipment (OEM) replacement regulator. Don't forget to inspect the fuel and vacuum lines and replace them if needed!
*Fuel Temperature Sensor Note:
This factory Nissan pressure regulator includes the fuel temperature sensor, which is pre-installed in the regulator body. Several of the above symptoms can also be caused when this sensor goes bad, or if the connection for the sensor has become corroded or damaged. If the self diagnostic on your Z is reporting Code 41, inspecting this sensor and it's connector should be your first step.
Model Guide:
Nissan 300ZX
Code Guide:
Nissan Z31
Year Guide:
1984, 1985, 1986, 1987, 1988, 1989
- (1) Fuel Pressure Regulator
- (1) Fuel Temperature Sensor*
Description:
The fuel pressure regulator has a simple task: maintain proper fuel pressure relative to engine speed when the car is running. Earlier Z-Car regulators are vacuum operated, which essentially allows the engine itself to adjust and maintain fuel pressure based on engine speed. Vacuum operated regulators can fail in a variety of ways, leading to different symptoms depending on the specific situation.
If your engine is running rich, it could be that the fuel return side of the regulator is clogged or damaged, resulting in higher pressure at the injectors. A regulator that is stuck in the closed position will also cause a rich condition in a similar way. The diaphragm can also rupture, leading to fuel being drawn through the vacuum line to the intake manifold. If the engine is running rich enough, you may see black, sooty smoke along with the exhaust. On the other side, you may run into a lean condition if the regulator is stuck open or damaged internally. This can show up as hard starting or stumbling at certain engine speeds.
As a critical component to engine operation, the regulator should be inspected or tested if symptoms appear, then replaced if needed. This is the genuine, original equipment (OEM) replacement regulator. Don't forget to inspect the fuel and vacuum lines and replace them if needed!
*Fuel Temperature Sensor Note:
This factory Nissan pressure regulator includes the fuel temperature sensor, which is pre-installed in the regulator body. Several of the above symptoms can also be caused when this sensor goes bad, or if the connection for the sensor has become corroded or damaged. If the self diagnostic on your Z is reporting Code 41, inspecting this sensor and it's connector should be your first step.
Model Guide:
Nissan 300ZX
Code Guide:
Nissan Z31
Year Guide:
1984, 1985, 1986, 1987, 1988, 1989
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Some parts may not fit every version of every year listed. See product Title & Description for any application breakdowns or customization options, and contact us with any questions.
- 1984 Nissan 300ZX-Z31
- 1985 Nissan 300ZX-Z31
- 1986 Nissan 300ZX-Z31
- 1987 Nissan 300ZX-Z31
- 1988 Nissan 300ZX-Z31
- 1989 Nissan 300ZX-Z31