The Honda 16020-ZA0-003 Diaphragm Assembly is a genuine OEM component designed for EL5000, ES6500, and EX5500 generators and the GX360 horizontal shaft engine. As a direct Honda OEM part, it is manufactured to the exact specifications of the original, ensuring proper fuel delivery and carburetor function. This Diaphragm Assembly is the correct replacement for these specific machines — confirm your unit's serial number against the fitment table before ordering, as Honda supersedes parts at serial breaks. Part number 16020-ZA0-003 is the factory-designated replacement for the carburetor diaphragm on these models.
Key Features
- Correct Fuel Metering Geometry — as a genuine OEM diaphragm, this assembly matches the original flex characteristics and porting dimensions that the carburetor depends on for consistent fuel draw and metering across the full throttle range.
- Direct OEM Replacement — engineered to fit the carburetor assembly on EL5000 and ES6500 generators, the EX5500 generator, and GX360 engines without modification, restoring the fuel circuit to original operating condition.
- Mixed Fitment — Verify Your Serial Number — this part covers both generators and the GX360 horizontal shaft engine; Honda parts are often updated at serial breaks, so check your machine's serial number against the compatibility table to confirm part number 16020-ZA0-003 is correct for your unit.
- Restores Hard-Start and Lean-Running Conditions — a cracked, hardened, or perforated diaphragm disrupts the carburetor's fuel-delivery circuit, causing hard starting, rough idle, or loss of power; replacing this assembly brings the fuel system back to proper operation.
The diaphragm assembly is a flexible membrane inside the carburetor that responds to pressure changes in the engine's intake to draw fuel from the bowl and deliver it into the air stream at the correct rate. On the generators and engine this part fits, a functioning diaphragm is essential to smooth starting and steady throttle response under load. When the diaphragm stiffens, tears, or develops pinholes with age and fuel exposure, the carburetor can no longer maintain the correct fuel-to-air mixture, leading to starting difficulties, erratic idle, or a loss of power output that worsens progressively until the assembly is replaced.
Part Details
| Part Number | 16020-ZA0-003 |
|---|---|
| Brand | Honda |
| Part Type | Genuine OEM |
| Description | Diaphragm Assembly |
Compatibility & Fitment
| Name | Models | Serial Range |
|---|---|---|
| Generator | EL5000 | 1409570-9999999 |
| Generator | ES6500, EX5500 | All |
| Horizontal Shaft Engine | GX360 | All |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
