Skip to product information
SKU:
NLT2T00485
Ships for free in 2–4 business days.
Fuel Feed Pump 129100-52101 for Yanmar 3TNE78 3TNE84 3TNE88 4TNE84 4TNE88
$53.99
In Stock
$53.99
Sale price
$53.99
Regular price
This mechanical fuel feed pump replaces Yanmar 129100-52101 on compatible TNE-series industrial diesel engines.
Estimated delivery between
Let Northline Parts Do the Heavy Lifting for You!
Not sure which part you need? Our team can help you find the right replacement.
Parts Support Hours: Monday–Friday, 8:00 AM–5:00 PM CT
Live Chat: Available 24/7
I reached out for some replacement head bolts and they responded quickly with a few questions and cautionary information and is sending me some bolts. Great customer service! Thanks
Edward H. — Verified customer
Compatible Models
We do our best to list all compatible models. Although this may be the part you need, your exact model may not appear below.
Compatible equipment / model
| Yanmar engines | 3TNE78, 3TNE78A, 3TNE84, 3TNE88 |
|---|---|
| Yanmar engines | 4TNE84, 4TNE88 |
Product Overview
The feed pump draws fuel through the low-pressure side and supplies the injection system. Worn internal check valves or diaphragm components can cause fuel drain-back, hard starting, weak performance under load or an engine that loses prime after sitting.
129100-52101 is commonly associated with 3TNE78/84/88 and 4TNE84/88 engines. Match the mounting flange, actuation lever and fuel-port orientation before ordering.
Key Features & Performance
- Mechanical diesel feed pump
- Reference 129100-52101
- Fits multiple Yanmar TNE engine families
- Helps restore low-pressure fuel supply and prime retention
Replaces Part Numbers
- 129100-52101
Technical Specifications
- Component: Fuel feed / lift pump
- Fuel type: Diesel
Frequently Asked Questions
Q: What can cause fuel drain-back besides the pump?
A: Loose fittings, cracked hoses, filter seals and tank-side air leaks can also let the system lose prime.
Q: What should match physically?
A: Check the lever, mounting flange, bolt spacing and port orientation against the original pump.
Fitment can vary by serial number, production date, engine configuration or prior repairs. Verify compatibility using the part numbers and application details listed above before ordering.