Next, we need to know the factorys maximum values, numbers, or pressure drops that the engine can tolerate to work properly for both the supply side (suction) and the return side (restriction-pressure of the return line). Posted 1278713120. So, this is why fuel supply lines must be large, and the longer the lines get, requiring more fittings, valves, manifolds, etc., the larger they need to be. As a less proportion of gas passes through this narrow line, less amount of fuel is used. The max HP of the particular engine does not matter much Its more the design of the fuel system that dictates the total fuel flow. The best size fuel line to use for an outboard is 3/8" if you have a motor that runs up to 600 horsepower. ), 16 Best Boats Under $100K (Each With Prices, Specifications & Photos! Do you know what will happen if you use a fuel line size of 5/16 diameter in a greater horsepower engine? The existing line is about 10' long and is 1/4". They have dual overhead cam (DOHC) powerheads with four valves per cylinder and multi-point sequential electronic fuel injection. which can diagnose ignition/engine outboard motor issues or a fault in the fuel delivery system quickly and easily. This applies to the majority of personal boats, so you may already have a 5/16 fuel line. Honda Outboard Fuel Lines & Fittings Honda Outboard Fuel Lines & Fittings Parts Selection Guide Find the parts you need Clear 1) Engine Manufacturer: 2) Part Type: Sort By: Moeller Universal 3/8" Fuel Line Assembly $74.99 $51.49 Add to Cart Moeller Universal 5/16" Fuel Line Assembly $76.49 $52.99 Add to Cart Moeller Tank Fitting for Honda Engines This doesnt mean that you will need to replace them right away, but its worth inspecting to make sure that there is no serious damage. But most smaller outboards have fittings or quick connects on them that are set for a 5/16 hose. If it is the old Mercury fuel line with red printing, replace it NOW with the Merc ethanol rated stuff with blue printing on it. $98.83. This difference in size creates a difference in their usage as well. ), Do You Need Boat Insurance When Renting a Boat? As soon as . Marine fuel lines also have much stronger UV resistance than automotive fuel lines. Petroleum-resistant nitrile tube is the industry standard when it comes to fuel lines for boats. $97.37. Taking frequent visits to art galleries and museums is his thing! Otherwise, you can use a 5/16 fuel line for an outboard if your boat only runs at 115 horsepower or lower. Can anybody tell me what fuel line size I need to get for a Tohatsu M40c? Then you have to prime up the system again before running!if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'bornagainboating_com-banner-1','ezslot_14',109,'0','0'])};__ez_fad_position('div-gpt-ad-bornagainboating_com-banner-1-0'); Here is an article that we wrote on Why An Outboard Engine Loses Prime & How You Can Fix it! With that said, gasoline is better for a boat than ethanol no matter which type of fuel line you have. Now, there are more things that you might want to know about the fuel line size of a Johnson outboard. Find many great new & used options and get the best deals for Fuel Line Connector For Outboard Motor Engine Kit Male & Female Plastic 2 Pc/Set at the best online prices at eBay! p. text-align: left, font-size: 18px, font-family: Times New Roman, line-height: 1.2, div. Because of the popularity the 6 cylinder 6BTA or 6CTA Cummins (not that it really matters), well use these engines as a basis for this discussion. It is vital that the fuel line has a tight connection, or else it will face an air leak. The compression ratio is 7. . Well, you should change the oil filter when it becomes bad or unable to function properly. Add to Wishlist. Free shipping. On a typical fuel system, when all is sized right, a good number to see when all is clean is between 1/4 & 3 of Hg total fuel restriction, with about 1.0 to 2 Hg most common in a well designed fuel system. Packing size: 19*10.5*. In other words, it indicates the fuel lines width. Regardless of the units of measure used, fuel restriction values need to be very low, and in a general sense, the lower the better when the system is fresh or new as this gives the operator more time between filter maintenance. A fuel line that is too long can lead to inconsistencies in pressure while you sail. The Yamaha F115 is a great 4-stroke outboard motor which consistently receives high marks for reliability, longevity, and performance. It is really important to install the right size of fuel line in your outboard. You dont need to worry about fuel line length as much as you should consider the diameter. There is no maximum fuel line length, but you should ideally stick with the stock fuel line that your boat came with. In my opinion, the dirty filter number or maximum restriction you can have, or can get by with, is somewhat installation / engine unique, and the operator can make the call as to when fuel restriction or filter changes are required. It can drink the fuel through the 5/16 line, but for how long is the real question! The fuel is unleaded gasoline, which is used in the USA. You should never use a rubber hose for a boats fuel line. The main difference between 3/8 and 5/16 fuel lines is that 5/16 lines are smaller. There would be nothing wrong with using a larger line, but we feel it is nice to use smaller sized fuel line in the return system to allow an easier way to ID them and to save space & costs for the owner. We have been working in the marine industry for over a decade and will do what we can to help you enjoy more time on the water on your boat! This manifold feeds 2 x QSM 630s and 2 x 20Kw gensets with #10 hose for the main and #8 hose for the generators ), Are Sea Rays Good Boats? How do you get to know that? When using E85, alcohol, methanol, etc. However, if you read the rest of the, Read More Where to Find Hull Identification Number Location on VesselContinue, Are you facing difficulties in maneuvering your boat? They are easy to connect and rig which makes them ideal if you have limited boating experience. Menu. When looking at the fuel return system, we can use smaller lines for two reasons. 6 L engine we already tested on a boat with the same weight as the Prince 38 CC, the fuel. 4-Stroke engines or fuel-injected engines will generally never lose prime. 5 HP Outboards . Add To Cart. Custom Last-Chance final high performance filter set-up for Yanmar 6LYA with larger than factory fittings and hoses If they are larger, the engine will not flood. (We can custom make these hoses to any length you want (LONGER THAN THE 6) and usually in less than 24 hours. Remember, the larger fuel line diameter means a higher fuel flow, and an engine with high horsepower requires more fuel flow. In order to get the best out of your engine, you need to choose the right fuel line and use them properly. It generally starts with a partial blockage, where playing around with the fuel hose and pumping the primer bulb will get the motor to start or keep it running. Nicole Abbott, Choosing the right motor for a pontoon boat is stressful, By Being loose will give an air leak which is a place to cause problems. Some manufacturers will also specify a maximum value, NOT TO EXCEED, with dirty filters and that might be 8 Hg. Taking frequent visits to art galleries and museums is his thing! Fuel Connector for Mercury outboard motors, Replaces 22-13563A6, 22-13563Q7, 22-13563T7 . Kaylee Giacomini, Owning a boat can add lots of opportunities for adventure,, By (Orders of $130 and above. Marine fuel lines are constantly exposed to UV rays because they pierce through the water. Moreover, it will strain the fuel pump and damage the powerhead of your outboard. Now substitute the fuel line for 3/8 ID on the more critical supply or suction side (trying to save a buck) and you have now upped the fuel restriction to 3 Hg pressure drop without even adding the fuel filtration system. This is why 3/8 is perfect for bigger, stronger engines. He is a friendly young guy who loves to hang out and go on trips. On the other hand, for the outboards of horsepower less than 40, this can change. And different specifications for different applications put in place for safety purposes. Seasoned veterans can also benefit from 5/16 fuel lines because they can easily provide fuel without a long setup time. :thumbsup: On the suction side, you don't need to go nuts but you should buy Coast Guard approved (thicker walls) hose. Although not part of the fuel supply system after the tanks, this was a fuel fill hose on a 46 Bertram we re-powered. Yamaha Outboard Gauge Wiring Diagram: Everything You Need To Know, Mercury Lower Unit Drain Plug Size & All The Details, Mercury Outboard Lower Unit Oil Capacity: Here Are The Right Capacities, Mercury Outboard Fuel Pump Problems: Top 6 Problems With Explanation, Where to Find Hull Identification Number Location on Vessel, Johnson Outboard Swivel Bracket Removal: Know the Exact Series of Steps. Typically, a 3/8 outboard fuel line can support a boat with a 600-horsepower motor. Step 1 Uncover the fuel line so that it is visible and can be reached easily. However, you have to use a 3/8 fuel line once you exceed 115 horsepower. But. A marine fuel line is totally different from an auto fuel line. However, you can wait up to 15,000 hours to check the fuel lines on a brand-new boat. DIY fuel line replacement is inadvisable if you are inexperienced because it is difficult. Some may come from an inline return fuel cooler (not much if they are sized right) and friction inside the fuel line with fuel flowing thru it, which brings us to what this discussion is about Fuel Line Restriction, and how it interacts or affects overall fuel restriction on both the supply and the return fuel system on a diesel engine. What Is the SBC Header Bolt Torque? Sorry, you're using a web browser that is no longer supported. Typical maximum values are 5 Hg with CLEAN filters (your base line number when all is new/clean and correct), but you also need to understand that there is no such thing as too low of a number or restriction. He is a friendly young guy who loves to hang out and go on trips. Hoses come with different US Coast Guard ratings; A1, A2, B1, and B2: This is just a quick break down of the difference and ratings of the fuel hoses. Instead, you should use the stock fuel line that your boat came with. One, the maximum allowed value for the pressure drop is usually 2-4 times more and the return flow is always less (at least to some extent) than the total fuel flow. Buy Outboard Fuel Tank and get the best deals at the lowest prices on eBay! Brass Tail For Sierra 21 Micron Fuel Filters, 3/8" NPT, 10mm Hose $10.90 $10.35. But, here is what all seem to not realize. Larger outboards, 150 and above, require more fuel to run at higher RPM's. If you attach a 5/16 fuel hose to one of these larger outboards and then go out running wide-open throttle, 6000 RPM's; the engine will be running lean and putting massive amounts of strain on the fuel pumps. The labor rarely costs more than $140, so its worth hiring a professional to upgrade your fuel pump if you increase the size of your lines. . Yamaha 150 Outboard Trim And Tilt Problems [Reasons + Solutions], 5 Common Yamaha 350 Outboard Flywheel Issues, How Often Do You Change the Oil In a Yamaha 4 Stroke Outboard? Go (800) 209-9624 M-F 9-5 ET (800) 209-9624 M-F 9-5 ET. Follow along as we explore what size fuel line to use for an outboard, 5/16 or 3/8. 8M6010292 Fuel Pump Kit - Yamaha - 75-115HP. It costs up to $500 or more to replace or upgrade your outboard fuel lines. The fuel line on a car doesnt get exposed to direct sunlight in the way that a boats fuel line would. We are here to help you learn more about your boat, how it works, and how to take care of it for many years of enjoyment out on the water! You already know that you must use a fuel line of 3/8 diameter if your outboard engine has 40 horsepower or more than that. $19.99. Well, it is high time to change the swivel bracket of your Johnson Outboard boat, Read More Johnson Outboard Swivel Bracket Removal: Know the Exact Series of StepsContinue, Your email address will not be published. Is your boat engine not rotating properly? Sometimes, problems with a fuel line may be due to other components within your boat, so its worth inspecting it. So, where could the restriction come from, you ask? The length of a fuel line matters because it affects the pressure. Great Savings & Free Delivery / Collection on many items. Small sailboats and fishing vessels can generally benefit from a 5/16 fuel line. Unfortunately, you may have to troubleshoot when you increase the size of your lines to see if your existing pump can keep up with them. If so, it must be a matter of great concern for you. This can result in operational errors and even motor damage in serious cases. PRIMER BULB 5/16" Hose Barbs Scepter EPA Approved #10542 Boat/Marine -Free Ship! Next, the fuel line of marine grade has a higher fire testing rate. 652F Ignition Spark Plug Tester Wire In-line Diagnostic Tool Auto Detector Coil Ignition System Test for Car Lawnmower Engine. The fuel line is either 5/16 inches or 3/8 inches. The 55 V-block design and offset driveshafts contribute to making them remarkably compact. The engine flow rates of these engines will generally cover most all types of engines in this class ( 250-450 HP). The line will be about 8' long. Outboard fuel line length is less important than the diameter. In addition, there is a specific time, Read More Mercury Outboard Oil Filter Chart for All Models ExplainedContinue, Is your mercury outboard burning fuel more than usual and stopping in the middle of the lake? Whats the Yamaha outboard fuel line size? Its undeniably a vague location to start with. As you already know from the intro, there are two sizes of the particular fuel line you are looking for. However, knowing these numbers isn't enough. This site is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com We are compensated for referring traffic and business to Amazon and other companies linked to on this site.