Early Rotary & 1979-85 Mazda RX-7 : Fuel System

 : Fuel System : Mallory/MSD 4309 Fuel Pressure Regulator

Mallory/MSD 4309 Fuel Pressure Regulator

RB Part Number: 18151


Price: $192.00

On backorder. Priority Pre-Order this part to ship as soon as available.
Estimated availability: 05/15/23.


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Mallory/MSD 4309 Fuel Pressure Regulator

The Mallory/MSD 4309 (MSD 29387) return-style design pressure regulator (shown with optional fuel pump) extends the life of the fuel pump and eliminates pressure drop that can occur at high RPM "launch" starts. A high quality pressure regulator is a crucial component for use with high-pressure fuel pumps in order prevent possible carburetor flooding. Designed with flow-matched inlet and outlets for ideal pump matching. Fully serviceable. Complete with mounting bracket and hardware, detailed instructions and fuel pump bypass spacer (optional). Design-matched for use with the optional Mallory/MSD 4070M Fuel Pump.

If the vehicle will be used for racing applications, (especially drag racing) adding this 4309 return-style Mallory Regulator and blocking off the internal bypass in the pump (and allowing the pump pressure to increase) is recommended. This set-up will greatly reduce the pressure drop off that can occur during sustained full-throttle runs. A 3/8" return fuel line is recommended for use with this regulator. (Hose fittings are not included.)

Additional Features:

- Range of adjustment; 3-12psi. (approximate)
- 3 outlet ports (in addition to return outlet and inlet)
- Port thread sized 3/8 NPT
- CNC-machined, billet aluminum construction
- Compact design

The Mallory Instruction Manual can be downloaded from Mallory's website by followin on this link.

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