Sylvie Willis
The Willys L134, also known as the Go Devil, is a flathead automobile engine that was famously used in the Willys MB and Ford GPW Jeep during World War II. Over time, the Go Devil engine has undergone various improvements, and enthusiasts continue to modify and enhance their Go Devil engines for better performance. One common issue that Go Devil owners face is water contamination in their fuel tanks, which can be addressed by installing a fuel/water separator. When it comes to fuel lines, owners often discuss the best practices for connecting to external gas tanks, troubleshooting fuel pump issues, and replacing dry-rotted hoses to ensure optimal engine performance.
Characteristics and Values of the Go-Devil Fuel Line
| Characteristics | Values |
|---|---|
| Engine Type | Straight-4 flathead automobile engine |
| Engine Power | 55 hp (41 kW; 56 PS) |
| Fuel Type | Mid-grade or premium |
| Fuel Grade | 87 octane |
| Fuel Pump | 12-volt low-pressure fuel pump |
| Fuel Line Material | Hose |
| Fuel Line Length | 14' or longer |
| Fuel Filter | In-line fuel filter |
| Fuel Connector | Quick-connect fittings or barbed fittings |
| Fuel Tank | Evinrude tank |
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What You'll Learn
Fuel/water separator
GO-DEVIL engines are air-cooled, 4-cycle, industrial engines that are no louder than a typical riding lawnmower. They are also designed to withstand various environments. However, GO-DEVIL engines are not immune to fuel-related issues. One such issue is water in the fuel, which can be mitigated by installing a fuel/water separator.
A fuel/water separator is a device that helps to remove water from the fuel before it reaches the engine. This is important because water in the fuel can cause several problems, including reduced engine performance and fuel pump issues. In the case of GO-DEVIL engines, some users have reported that their engines experienced problems due to water in the fuel tank.
One user reported that their friend's GO-DEVIL engine had issues due to water in the gas can. They inquired about installing a fuel/water separator, but their friend expressed concern that it might not work well with mud motors and could affect fuel pressure. However, another user shared their positive experience with a fuel/water separator on their boat, which helped improve the performance of their engine when using gas containing alcohol.
Another user with a GO-DEVIL engine encountered a similar problem and asked about the effectiveness of fuel/water separators. They received a response confirming the usefulness of can-type fuel/water separators, especially for GO-DEVIL-powered boats with forward fuel tanks. GO-Devil also sells these separators, and they can be purchased directly from the manufacturer or potentially found at lower prices from other vendors.
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Hose cracks
Fuel hose cracks are a common issue, and there are several reasons why this might be happening. Firstly, over time, fuel hoses can become dried out and brittle, which makes them more susceptible to cracking and leaking. This is a natural process that occurs as a result of the hose material breaking down. In addition, the type of fuel used can also contribute to hose cracking. For example, ethanol in higher concentrations can erode the aluminium hose ends and fittings, making them more prone to cracking. Similarly, biodiesel blends can extract the plasticizer from the walls of the rubber compound, causing it to harden and become more brittle.
Another factor to consider is the quality of the hose. Cheaper hoses are more likely to crack and fail prematurely due to the use of lower-quality materials. It is worth investing in good-quality fuel hoses to avoid this issue. Additionally, it is important to ensure that the hose is the correct type for your vehicle and fuel type. Using the wrong type of hose can lead to incompatibility issues and a higher risk of failure. For example, a hose that meets the SAE J30R9 standard is suitable for gasoline, ethanol-extended gasoline, diesel fuel, and biodiesel, while a hose that meets the SAE J30R7 standard is not compatible with biodiesel fuels and has a much higher permeation level.
Improper installation can also lead to hose cracks. If the couplings are fixed on too tightly, it can cause stress on the rubber, leading to cracks. Similarly, if the ID of the hose is very slightly smaller, it can cause the rubber beyond the metalwork to increase in volume, resulting in cracking. It is important to ensure that the hose is installed correctly and that the fittings are compatible with the hose to avoid this issue. Additionally, it is worth noting that fuel hoses typically last several years, but this can vary depending on the usage and conditions of the vehicle.
To prevent hose cracks and failures, it is recommended to inspect the hoses regularly and replace them if they show any signs of cracking or leaking. This is important not only for maintaining the performance of the vehicle but also for safety, as fuel leaks can quickly become a fire hazard. If you are unsure about the condition of your hoses or how to replace them, it is always best to consult a professional technician. They will be able to inspect the hoses, diagnose any issues, and provide a suitable solution to ensure the safe and efficient operation of your vehicle.
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Fuel pump
The fuel pump is a crucial component of any engine, responsible for delivering fuel from the tank to the engine. When considering the fuel pump in the context of Go-Devil engines, it's important to understand the specific requirements and potential challenges.
Go-Devil engines are commonly used in boats, and maintaining proper fuel delivery is essential for their reliable performance. One of the key considerations is the fuel line size, which directly impacts the pump's ability to deliver fuel efficiently. While the exact fuel line size for Go-Devil engines may vary depending on specific models and applications, ensuring adequate fuel flow and pressure is critical.
In general, the fuel line size for Go-Devil engines tends to be on the smaller side. This is due to the unique characteristics of these engines, which often have shorter hoses compared to other outboard motors. Go-Devil engines are also known for their strong diaphragm internal fuel pumps, which can influence the required fuel line size.
When selecting the appropriate fuel line size, it's important to consider factors such as engine size, fuel consumption, and desired horsepower. For example, a 3/8" ID fuel line is commonly used in high-horsepower applications and can easily support 600 HP with sufficient "pump head". Increasing the pump head can be achieved by using a bigger pump, higher pump voltage, or opting for a larger line size. However, it's worth noting that simply increasing the line size may not always be necessary, as a properly sized fuel line with adequate pumping power can handle significant horsepower.
To ensure optimal performance, it is recommended to install an electronic fuel pressure gauge. This allows for real-time monitoring of fuel pressure, and any drops in pressure as engine RPMs increase may indicate the need for adjustments, such as increasing pump head or addressing a dirty fuel filter. Additionally, the use of a fuel/water separator is worth considering, especially in regions where fuel quality may be an issue. These separators help prevent water contamination in the fuel, which can cause performance issues and damage to the engine.
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Fuel type
The Willys L134, also known as the "Go-Devil" engine, was used in Willys MB and Ford GPW Jeeps during World War II. It was also later used in civilian Jeep vehicles. The Go-Devil engine is an air-cooled, 4-cycle, industrial engine. It is recommended to use mid-grade or premium fuel with a viscosity of 10w 30 in these engines. In colder temperatures, lighter oils are suggested.
Go-Devil engines can experience fuel-related issues. Some users have reported problems with water in their gas tanks, which can be mitigated by installing a fuel/water separator. However, there are concerns that these separators may not work well with mud motors due to potential fuel pressure issues. It is also recommended to check the fuel line for any cracks or dry rot, as this can cause the motor to lose its prime and stutter.
One user reported that their Go-Devil engine was not performing well at higher elevations, and they were considering converting it to fuel injection to improve performance. Another user suggested that a fuel pump might be necessary if the tank is located far from the engine, as is common in Harbor freight, Hondas, and other similar boats.
To ensure optimal performance and avoid fuel-related issues, it is important to maintain and regularly check the fuel system in Go-Devil engines. This includes inspecting the fuel lines, fuel pump, and, if necessary, installing a fuel/water separator.
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Fuel tank
Go-Devil is a manufacturer and retailer of a wide variety of options and accessories for your Go-Devil products. They stock everything from fuel tanks to camo seats and engine covers. With over 40 years of experience, Go-Devil's products are designed and tested in the harshest shallow water environments.
Go-Devil boats are available in two predominant hull types: the rounded chine “Duck Hunting Boats” and the tapered chine “Surface Drive Boats”. The Go-Devil Surface Drive Engine is engineered to provide maximum performance and durability through the thickest muck and nastiest environments.
The fuel tank is an essential component of the Go-Devil engine. It is important to ensure that the fuel tank is properly vented and that there is no water in the gas tank, as this can cause problems with the engine. One way to address this issue is to install a fuel/water separator, although some people have expressed concerns about fuel/water separators messing up the fuel pressure.
When it comes to the fuel lines, it is important to ensure that they are the correct length and that they are installed properly. In some cases, an extra-long fuel line may require the addition of a low-pressure 12-volt fuel pump. It is also recommended to have a can-type separator, especially for forward fuel tanks.
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Frequently asked questions
The fuel line size depends on the model of the Go-Devil engine. For a 16hp long shaft Go Devil engine, a 5' hose is sufficient. For a 31HP Go Devil, a longer gas line is required to position the tank in the middle of the boat.
It is recommended to use mid-grade or premium fuel with a 10w 30 viscosity. In very cold temperatures, lighter oil is recommended.
The oil should be changed after the first 10 hours of use, and then every 50 hours or once a year.
Any waterproof, high-temperature grease is suitable for Go-Devil engines.
