PACCAR MX-13 High-Pressure Fuel Pump Mounting Bolts
The MX-13 high-pressure fuel pump is gear-driven from the front of the engine. Proper mounting torque prevents pump movement and gear mesh issues. The MX-13 HPFP uses banjo-style high-pressure fuel connections — banjo bolt torque is critical to prevent high-pressure fuel leaks.
Important: These torque specs are reference values. Always verify against your OEM service manual for your specific engine serial number and build date. Torque-to-yield bolts must be replaced — never reused.
Torque Specifications
| Step | Torque Value | Notes |
|---|---|---|
| HPFP Mounting Bolts | 18 ft-lbs (24 Nm) | Torque in a star pattern. |
| High-Pressure Banjo Bolt | 37 ft-lbs (50 Nm) | Use new copper sealing washers on both sides of banjo fitting. Do not reuse. |
| Low-Pressure Fuel Inlet Fitting | 18 ft-lbs (24 Nm) | Use new O-ring. Lubricate with clean diesel fuel. |
Related Fault Codes
Click any fault code to open the AI Diagnostic Engine for guided troubleshooting.
Frequently Asked Questions
What is the torque spec for PACCAR MX-13 high-pressure fuel pump bolts?
MX-13 HPFP mounting bolts torque to 18 ft-lbs (24 Nm) in a star pattern.
What is the torque for MX-13 high-pressure banjo bolts?
MX-13 high-pressure banjo bolts torque to 37 ft-lbs (50 Nm) with new copper sealing washers on both sides.
Can MX-13 banjo bolt sealing washers be reused?
No — always use new copper sealing washers on MX-13 banjo bolt connections. Reused washers will leak under rail pressure.
What fault codes are related to MX-13 fuel pump issues?
Common related fault codes include SPN 157 FMI 18 (fuel rail pressure low) and SPN 1189 FMI 3 (fuel pressure high).