Description
The PAI 840071 is an aftermarket fuel overflow (return-pressure regulator) valve for Mack MP7 / MP8 and Volvo D11 / D13 diesel engines. The valve regulates fuel pressure in the return circuit and stops fuel from draining back to the tank when the engine is shut down, preventing prime loss and extended cranking on restart. Direct replacement for OEM 21458307, 20715052, and 21022032.
Signs You Need a New Fuel Overflow Valve
- Extended cranking or hard starting, especially after the truck sits overnight
- Engine loses prime and requires repeated priming pump cycles
- Stumbles or stalls shortly after startup
- Low fuel-feed-pressure fault codes
Specifications
| Manufacturer | PAI Industries |
|---|---|
| Part Number | 840071 |
| Part Type | Fuel Overflow / Return-Pressure Valve |
| Engine Compatibility | Mack MP7, MP8; Volvo D11, D13; Renault DXi 11, DXi 13 |
| Weight | 0.20 lb |
| Warranty | 2-Year Unlimited Mileage |
Cross References
This valve replaces or is equivalent to the following part numbers:
- Mack: 21458307, 20715052, 21022032
- Volvo: 21458307, 20715052, 21022032
Applications
This fuel overflow valve fits the following engines:
- Mack MP7 (10.8L) (2007–2024)
- Mack MP8 (12.8L) (2007–2024)
- Volvo D11 (10.8L) (2007–2024)
- Volvo D13 (12.8L) (2007–2024)
- Renault DXi 11 / DXi 13
Representative vehicles using these engines:
- Volvo VNL, VNR, VNM, VNX, VHD (2007–2024)
- Mack Pinnacle CXU (2008–2019)
- Mack Anthem (2018–2024)
- Mack Granite GU (2008–2024)
Verify your engine serial number and emissions configuration before ordering. The MP7/MP8 and D11/D13 platforms share this fuel-system component across emission tiers (EPA07/10/13/17) but specific revisions may exist — cross-check OEM number on your old valve.
