S-066 SSC Diaphragm to Fit Suntec A Pump – Replaces 3773151 (GS-165)
📝 Product Overview
The S-066 SSC Diaphragm is a precision-engineered replacement part designed specifically to fit Suntec A-Series oil pumps. It replaces Suntec 3773151 (GS-165) and ensures proper pressure control and consistent performance in your burner system.
Made from durable, fuel-resistant materials, the S-066 diaphragm helps maintain steady oil pressure and reliable pump operation — preventing leaks, inconsistent combustion, and pump cycling issues.
⚙️ Technical Specifications
| Specification | Details |
|---|
| Brand |
SSC |
| Part Number |
S-066 |
| Replaces |
Suntec 3773151, GS-165 |
| Fits Pump Type |
Suntec A-Series |
| Outside Diameter (OD) |
1-3/4" |
| Function |
Regulates pressure and maintains pump seal integrity |
| Material |
Fuel-resistant composite diaphragm |
| Application |
Residential and commercial oil burner pumps |
🌟 Key Features
✅ Direct Replacement – Fits Suntec A-Series pumps perfectly; replaces OEM 3773151.
✅ Durable Construction – Built from high-quality, fuel-resistant materials for long life.
✅ Restores Proper Pump Function – Ensures consistent pressure control and smooth burner performance.
✅ Easy Installation – Drop-in replacement; no modifications required.
✅ Precision Fit – 1-3/4" OD for accurate sealing and dependable operation.
⚠️ Common Symptoms of a Failing Diaphragm
-
Fuel leaks near the pump housing
-
Inconsistent or low oil pressure
-
Burner short cycling or frequent lockouts
-
Delayed ignition or poor combustion efficiency
-
Air intrusion in fuel lines
❓ Frequently Asked Questions (FAQ)
Q1: What pumps does this diaphragm fit?
➡️ It is designed for Suntec A-Series oil pumps.
Q2: What part does it replace?
➡️ Replaces Suntec 3773151 (GS-165) diaphragms.
Q3: How can I tell if my diaphragm needs replacing?
➡️ If you notice pressure fluctuation, oil leaks, or burner cycling irregularly, replacement is recommended.
Q4: Is it compatible with biofuel blends?
➡️ Yes, it is compatible with standard heating oils and light biofuel blends (up to B5).
🛍️ Shopping Tips
✅ Always confirm your pump model (A-Series) before ordering.
✅ Replace diaphragm during pump rebuild or maintenance for best results.
✅ Check seals and gaskets when replacing the diaphragm.
✅ Keep a spare on hand for quick service calls or seasonal maintenance.
