Next. Turn off the main electrical cutoff switch. Hi everyone, I posted a thread a while back about power cutting in and out on my '95 Mercury 90hp motor, at the time I thought it was a electric problem, but I have since discovered it is a fuel problem so I wanted to start a new thread to try to isolate the problem. Darrel. 03. However, if you want to get right to the outboard fuel pump, we have the steps you need to know.eval(ez_write_tag([[300,250],'bornagainboating_com-box-4','ezslot_13',108,'0','0'])); Another form of testing to see if there are fuel tank issues is to pressure test your fuel tank to find leaks, which we cover in this article here. play video. (List Price 433.63) 1-32-13907-1 FUEL PUMP ELECTRICAL YAMAHA 50-90 4 STROKE 05-UP MERCURY 75-100 08-UP Cross Ref #: 13907-1, 18-8864, 6C5-13907-00-00, 8M0065218, 866169T01, 880889T02 Mfg Part #: 6C5-13907-00-00 Click to see complimetary Items If you have a fuel flow monitor, you can also measure the mpg to see when it reaches its peak efficiency. You might notice sputtering or misfiring before the engine cuts out completely.eval(ez_write_tag([[728,90],'bornagainboating_com-box-3','ezslot_7',105,'0','0'])); To help you get back on the water, we will talk about how the outboard fuel system works, discuss ways to troubleshoot the issues and give you some expert pointers along the way. fuel connections and hoses for leaks or kinks. 4.6 out of 5. Availability: In stock. Just Click Here! FREE Shipping by Amazon. To understand what you are looking at, you must first know the components of the outboard fuel system. Save my name, email, and website in this browser for the next time I comment. Fuel Pump Diaphram Kit, Mercury - Mercruiser 21-857005A-1 Fuel Pump Kit for Mercury and Mariner Outboards Fits: 30 JET 35 hp (Serial No. Only 15 left in stock - order soon. While a bad outboard fuel pump can be causing the engine to suffer from hard starts, it may not be the only problem you face. Located under the cowl on all Mercury/Mariner V-6 outboard engines, 1996 and newer. Thankfully, outboard fuel pumps don’t fail often. In modern fuel injected vehicles, the fuel pump sits right in the fuel tank and “pushes” the gasoline to the fuel rail (s). To avoid headaches, it’s best to prevent a failure from occurring in the first place. Sierra 18-7350 Fuel Pump Replaces 0397839. If the cylinder has a leak, the pump pulse signal will not be strong enough to send the proper amount of fuel to the cylinder. Additionally, as part of your boat maintenance, you want to replace the fuel filter once a year. Normal fuel pumps will put out between five and seven PSI. It’s vital that you work through a process of elimination when diagnosing your outboard fuel problems. Remove the snaps on the outboard motor upper case and take off the cowl cover. You want to blow through both ends to look for obstructions. By maintaining the fuel system, you can avoid having a bad outboard fuel pump, as well as other concerns. We have the Mercury outboard parts you need and offer free shipping on orders over $99! 20. 1 Year Extended Warranty + … Plus, you want to browse our helpful articles for more information about your boat and the engine. sometimes misfires/backfires when having these other symptoms Your fuel pump is whining well I have found that in the majority of the cases I have seen the actual problem is the very small filter on the fuel intake side of the fuel pump. Since 1968, West Marine has grown to over 250 local stores, with knowledgeable Associates happy to assist. 1 Fuel Filter + $18.99 . This component draws fuel out of the tank and directs it to the engine. idle and low speed appear ok. though it was possibly bad gas as it had fuel in tank from last year still. 99. Here are a few symptoms you might notice when the fuel pump diaphragm fails. Shop for Mercury outboard fuel & oil filters for all make and models via Outboard Spares now. You can either replace the fuel pump or opt for a rebuild kit instead. The OPTIMAX is the most MIS-DIAGNOSED Outboard Engine. However, blockages aren’t going to repair themselves. When the diaphragm wears out or becomes damaged, the mechanical fuel pump might not work at all or cause performance issues. The motor may surge at high speeds or it may cut out or hesitate. Eventually, these will fail completely, causing the engine to stop running.eval(ez_write_tag([[336,280],'bornagainboating_com-banner-1','ezslot_15',109,'0','0'])); As the fuel pump produces less pressure, the engine fails to operate. Squeeze the ball/bulb while trying to run the motor……if the motor starts to run correctly while increasing the fuel pressure by squeezing the bulb, you have blockage somewhere in the fuel line from the bulb to the fuiel filter. Get Your Own Born Again Boating Apparel! Get it as … attwood 93806MUS7 Marine Boat 6-Foot x 3/8-Inch Fuel Line Kit for Mercury Engines with Universal Sprayless Fuel Connector, Gray. Look in your owner’s manual to find the proper PSI for your outboard engine. Occasionally, the motor will quit altogether and will not re-start. However, you can’t judge simply based on this fact, as slow speeds will naturally improve fuel economy, but also cause the motor to run longer, putting more age on the engine. Look before you pump. Thanks! 36 global ratings. )Fuel Pump … var hs = document.createElement('script'); hs.type = 'text/javascript'; hs.async = true; This troubleshooting guide will help you determine why your 9.9HP Mercury boat motor won’t start. This component is needed to protect the motor from contaminants that are in the gasoline. Meanwhile, encouraging you to take care of and enjoy working on your boat! When the outboard fuel pump is bad, it operates similarly to when the boat runs out of fuel. Loosen the fuel filter hose clamps and pull off the filter. 5 star 81% 4 star 7% 3 star 7% 2 star 0% (0%) 0% 1 star 5% How are ratings calculated? If the spark plug is fouled, it can no longer ignite the air/fuel mixture. FREE Shipping by Amazon. Grey coated hoses (those with UV protection) seem to have more complaints than most. If the compression falls under 30 PSI, the fuel pump won’t function correctly because of the low pulse pressure. Today, he spends his time freelance writing and consulting. This means taking your boat and motor to a nearby body of water, tying the boat to the dock, rigging the test equipment to the fuel system and running the boat at idle, half-speed and full-speed. in depth to troubleshooting the fuel delivery system that you find on your boat here! Which is what we have covered for most of this article. What it's doing is it will run fine untill about 3000 rims after that the power starts cutting in and out. What seems like a bad outboard fuel pump can actually be one of many other issues. What is bad gas? You got the boat packed with your gear and your best friends. This cup filter is found on the side of the boat’s motor, sitting between the low-pressure fuel pump and the tank. Water Separating Fuel Filter Kit for V-6 EFI/DFI Outboard, Mercury - Mercruiser 35-18458T-4 Water Separating Fuel Filter with the blue screw-in sensor. When the cylinder leaks, the pump pulse signal isn’t strong enough to get the right amount of fuel to the cylinder. There must be enough fuel in the tank to be picked up. Brian Jones has spent most of his career as an ASE Certified Master Tech. Causes of Filter Problems Could this be the sign of a bad outboard starter, and what should you do now? By stopping flames from contacting other fuel sources, fire is averted. link to Signs of a Bad Outboard Starter & How to Start the Engine, link to Signs of a Bad Outboard Water Pump & Maintenance Tips. One of the first symptoms of a problem with the fuel pump is a loud whining sound. When the diaphragm is completely damaged, it will become unable to pump fuel at all. If your outboard motor has a mechanical fuel pump. 4.2 out of 5 stars 70. 2 Year Extended Warranty + $15.99 . The clamps back up with your gear and your best friends between the fuel., 1996 and newer reaches its peak efficiency start up Marine water pump Kit Mercury. I just wonder if anyone agrees that this is a fuel flow monitor you... 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