7W-7032 72W703 Fuel Injector for 3406B Engine
Product Specifications
| Product Name |
Fuel Injector |
| Part Number |
7W-7032/72W703 |
| Equipment Fit |
3406B |
| Type |
Engine Parts |
| Place of Original |
GUANGZHOU |
| Brand Name |
JIAJUE |
| MOQ |
1 Piece |
| Condition |
New |
| Availability |
Rich Stock |
| Approximate Weight |
1KG |
| Size (per piece) |
20cm x 5cm x 8cm |
| Warranty |
3 Months |
| Shipment |
Dispatched within 3 days |
Product Images
Frequently Asked Questions
Q1: How do I install my fuel injector after purchasing it?
Please refer to the "Step-by-Step Installation Guide" on our product details page, which contains detailed installation instructions.
Q2: What precautions should I take before installing my fuel injector?
The installation environment must be dust-free; lubricate the O-ring with clean machine oil before installation to prevent oil leakage; and ensure the O-ring is installed correctly.
Q3: Why is my engine still unusable after replacing the fuel injector?
This is commonly due to air trapped in the high-pressure oil rail. Cycle the engine in short bursts (no more than 30 seconds) to purge air. It may take several attempts to stabilize pressure.
Q4: Is my device compatible with this part number of fuel injectors?
If unsure about compatibility, please provide your Engine Serial Number (ESN) for free verification.
Q5: How to determine if your fuel injectors need replacing?
- Cylinder Cut-out Test: Using diagnostic software (ET), shut off cylinders one by one and observe engine speed fluctuations to locate faulty cylinders.
- Fuel Rail Pressure Test: Check for internal leaks preventing system from building critical starting pressure.
- Back-leakage Test: Excessive back-leakage indicates severe wear of internal control valve assembly.
- Visual Inspection: Inspect fuel injector nozzles for carbon buildup, blockage, or corrosion.
Q6: How long will it take to receive my package after I make the payment?
Delivery time depends on your country, region, and customs clearance. Contact us with your address and postal code for shipping costs and estimated delivery time.
Step-by-Step Installation Guide
Pro-Tip: HEUI (Hydraulic Electronic Unit Injection) systems are extremely sensitive to contamination. A single speck of dust can cause premature failure.
1. Preparation: Clean the injector bores thoroughly. Ensure there is no carbon debris, old O-rings, or fuel/oil residue at the bottom of the seat. Inspect the injector sleeve for any signs of pitting or erosion.
2. Lubrication: Apply clean engine oil to the three O-rings and the backup rings.
Never use grease. Only use clean engine oil to ensure the seals slide in without tearing.
3. Seating the Injector: Push the injector down firmly by hand until you feel it "seat." Install the hold-down clamp and bolt.
4. Torque Specifications: Tighten the bolt to 30 N⋅m±7 N⋅m (22 lb-ft).
Over-tightening can crack the injector body; under-tightening causes combustion gas leakage.
5. Trim Code Programming: Locate the 6-digit alphanumeric code on the top of the injector solenoid. Use ET (Electronic Technician) software to program this code into the ECM to ensure precise fuel delivery synchronization.
Troubleshooting Guide
| Issue |
Root Cause |
Solution |
| Black Smoke |
Poor spray atomization or stuck needle valve causing dripping |
Inspect the air filter |
| Hard Start |
Internal leakage in injector leading to insufficient starting oil pressure |
Inspect injector O-rings and internal seals |
| Engine Misfire |
Faulty solenoid valve coil or worn internal valve components |
Inspect wiring harness connections and replace damaged injectors |
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