D3963808 1110010007 Pressure Relief Valve for Cummins ISL9 QSL9
3963808 Cummins Pressure Relief Valve | Fits ISL9 QSL9
Product Information
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- Replacement Brand: Cummins
- Category: Fuel System – Pressure Relief Valve
- Part Number: 3963808
- Part Name: Pressure Relief Valve
- Alternative OEM: Bosch 1110010007
- Engine Model: Cummins ISL9, QSL9
- Compatible Equipment: Not Verified
- Condition: New Aftermarket Replacement
Product Function & Specs:
The 3963808 is a Cummins pressure relief valve used within the engine fuel-system pressure circuit. It controls excess fuel-system pressure by providing a controlled relief path when the specified pressure condition is reached. Parts catalogues associate the number with Cummins ISL9 and QSL9 engine applications.
Failure Symptoms:
- Unstable fuel-system pressure
- Hard starting or irregular engine operation
- Reduced engine performance associated with fuel-system pressure problems
Quick Installation Notes:
- Relieve fuel-system pressure and follow the applicable Cummins service procedure before removal.
- Keep the valve, fuel passages, and surrounding components free from dirt and contamination during installation.
- After installation, inspect the fuel system for leakage and verify operation according to the applicable service procedure.
Maintenance Tips:
- Use clean fuel and maintain the recommended fuel-filter service interval.
- Prevent water and particulate contamination from entering the fuel system.
- Investigate abnormal fuel pressure or engine operating symptoms promptly.
FAQ:
Q: What is Cummins 3963808?
A: 3963808 is a Cummins pressure relief valve used in fuel-system applications.
Q: Which engines use 3963808?
A: Public Cummins parts catalogues associate 3963808 with QSL9 applications, while other diesel-parts references associate it with ISL9 engines. Confirm the exact engine configuration before ordering.
Q: Is Bosch 1110010007 an alternative reference?
A: Bosch 1110010007 is listed as an aftermarket cross-reference for Cummins 3963808. Confirm the valve specification and application before treating the numbers as interchangeable.
Q: What should be checked before installation?
A: Confirm the Cummins part number, engine model, fuel-system configuration, and applicable service procedure before installation.
Q: Is this an OEM or aftermarket replacement?
A: The product offered by WinsParts is a new aftermarket replacement for Cummins 3963808. Application should be verified before installation.
Why Sourcing From WinsParts?
WinsParts supports part-number and application verification before quotation, helping dealers and repair workshops confirm fuel-system components against the required Cummins engine configuration.
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