First Impressions of Sierra International 187350 Fuel Pump
The Sierra International 187350 Fuel Pump promises to be a vital component for Johnson/Evinrude outboard engines, specifically the 6, 8, 9.9, and 15 HP models from 1981-1998. This little pump carries the weight of keeping those engines running smoothly, and aftermarket parts, especially fuel-related, can be a gamble. Will it deliver the reliability and performance I expect from a Sierra product?
Having rebuilt numerous small engines, including outboards, over the years, I understand the critical role the fuel pump plays. A faulty pump can lead to hard starting, poor idling, and even complete engine failure – a situation you definitely want to avoid when you’re miles from shore. It’s designed as a direct replacement for several OEM part numbers (391638, 395091, 397274, 397839) and EMP (1399-07350) and Mallory (9-35350) pumps, offering a potentially more affordable alternative to OEM parts.
I needed a replacement fuel pump for my old fishing boat’s 9.9 HP Evinrude. It was suffering from fuel starvation at higher RPMs, making trolling nearly impossible. Other generic fuel pumps felt flimsy and I’d heard mixed reviews, so the Sierra International name, with its reputation for quality in marine components, caught my eye. I was debating between this and a genuine Evinrude pump, as well as an aftermarket Mallory pump. I opted for the Sierra International 187350 Fuel Pump hoping for a balance of price and performance.
Upon unboxing, the pump felt solid and well-constructed. It had a reassuring weight and the diaphragm material looked robust. Compared to some of the cheaper aftermarket pumps I’ve seen, this one gave off an air of quality. My initial impression was cautiously optimistic. This pump could be the solution to my engine woes, but the real test would be how it performs on the water.
Real-World Testing: Putting Sierra International 187350 Fuel Pump to the Test
First Use Experience
My first test of the Sierra International 187350 Fuel Pump was on the lake, where I do most of my fishing. Installation was straightforward, matching the OEM pump’s dimensions and mounting points. After priming the fuel line, the engine fired up on the second pull – a promising start!
The weather was typical for early spring: a bit chilly and damp. I put the engine through its paces, running it at various speeds and monitoring its performance. The improvement was immediately noticeable. The engine idled smoothly, accelerated without hesitation, and maintained consistent power at full throttle. No more fuel starvation!
Extended Use & Reliability
After several weeks of regular use (about 2-3 fishing trips per week), the Sierra International 187350 Fuel Pump continues to perform flawlessly. The engine starts easily every time, and I haven’t experienced any of the issues I had with the old pump. There are no signs of leaks or deterioration.
The durability seems excellent so far. I’ve been careful to use fuel stabilizer and keep the fuel system clean. Since the pump’s function dictates long term reliability, time will truly tell; however, so far, the Sierra International 187350 Fuel Pump outperforms expectations considering its price point.
Maintenance is simple. There is no real maintenance, other than ensuring clean fuel and proper winterization of the engine. The pump is easily accessible if I ever need to inspect or replace it in the future.
Breaking Down the Features of Sierra International 187350 Fuel Pump
Specifications
The Sierra International 187350 Fuel Pump is a diaphragm-type fuel pump designed specifically for Johnson/Evinrude 2-stroke outboard engines. It is engineered as a direct replacement for:
EMP 1399-07350
Johnson/Evinrude 391638
Johnson/Evinrude 395091
Johnson/Evinrude 397274
Johnson/Evinrude 397839
Mallory 9-35350
Engine Compatibility: Johnson/Evinrude 6, 8, 9.9, and 15 HP engines from 1981 to 1998.
Type: Diaphragm pump.
Material: Not explicitly specified, but appears to be a combination of metal (likely aluminum) and a fuel-resistant synthetic diaphragm.
Function: Mechanical fuel pump driven by engine vacuum or crankcase pressure.
These specifications are crucial because they directly impact the pump’s ability to deliver fuel efficiently and reliably. The diaphragm design is simple and effective, but the quality of the diaphragm material is key to its long-term durability. Proper fitment ensures easy installation and prevents leaks.
Performance & Functionality
The Sierra International 187350 Fuel Pump performs its job admirably. It delivers a consistent and adequate fuel supply to the carburetor. This is essential for smooth engine operation across the entire RPM range.
Its strengths lie in its ease of installation, reliable performance, and reasonable price. A potential weakness could be the long-term durability of the diaphragm, but so far, it has held up well. It definitely meets my expectations, providing a cost-effective solution to my fuel starvation problem.
Design & Ergonomics
The design is straightforward and functional, mirroring the OEM pump. The build quality appears solid. The materials feel durable enough for the marine environment.
The pump is not something you hold in your hand frequently, so ergonomics aren’t a major concern. However, its compact size and easy access for installation are definite pluses. There is no real learning curve, as installation is similar to the OEM pump.
Durability & Maintenance
Based on my experience so far, I expect the Sierra International 187350 Fuel Pump to last for several seasons with proper care. Regular fuel filter changes and the use of fuel stabilizer are essential to prevent fuel system problems. Maintenance is limited to visual inspections for leaks and ensuring clean fuel.
Accessories and Customization Options
The Sierra International 187350 Fuel Pump is a self-contained unit, so there are no direct accessories or customization options. However, it’s compatible with standard fuel lines and fittings. Some owners might choose to add an inline fuel filter for extra protection.
Pros and Cons of Sierra International 187350 Fuel Pump
Pros
- Affordable alternative to OEM fuel pumps. It offers significant cost savings.
- Easy installation. It is a direct replacement for specified Johnson/Evinrude engines.
- Improved engine performance. It eliminates fuel starvation issues and restores smooth operation.
- Good build quality. It inspires confidence in its long-term reliability.
- Direct Fit. Matches OEM specifications perfectly
Cons
- Long-term durability is yet to be fully determined. The diaphragm’s lifespan is crucial and needs more time to assess.
- Not a performance upgrade. It simply restores the engine to its original operating condition, rather than boosting performance.
Who Should Buy Sierra International 187350 Fuel Pump?
The Sierra International 187350 Fuel Pump is perfect for boat owners who have Johnson/Evinrude 6, 8, 9.9, or 15 HP engines from 1981 to 1998 experiencing fuel delivery problems. It’s a great choice for those looking for a reliable and affordable replacement part. DIY mechanics who are comfortable working on small engines will find this pump easy to install.
This product should be avoided by owners of engines outside the specified HP and year range. Also, if you’re looking for a performance upgrade or a heavy-duty fuel pump for modified engines, this isn’t the right choice.
A must-have accessory would be a high-quality inline fuel filter to protect the pump from debris and prolong its lifespan.
Conclusion on Sierra International 187350 Fuel Pump
The Sierra International 187350 Fuel Pump has proven to be a reliable and cost-effective solution for my outboard engine’s fuel starvation problem. It’s easy to install, performs flawlessly, and appears to be well-built.
The price is definitely justified. It’s significantly cheaper than an OEM pump without sacrificing performance or quality. I would absolutely recommend the Sierra International 187350 Fuel Pump to anyone needing a replacement fuel pump for their Johnson/Evinrude engine.
Don’t let a faulty fuel pump ruin your time on the water. Get the Sierra International 187350 Fuel Pump and get back to enjoying smooth and reliable engine performance!