foxstrike
08.06.2021 2:17:43
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See full version: Fuel Lines; Fittings
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Addressing your problem, from the sound of your description, one or both of the check valves have gone south in your primer bulb. These check valves allow fuel movement through the primer bulb in only one direction. toward the motor. That's what the arrow on the bulb indicates..fuel flow direction. Here's what ya' can do. take the fuel hose off and drain it of fuel. Now shake the bulb and see if you can hear something rattling around in it. If you do, one of the checks have fallen apart. You can squeeze the bulb flat and feel the check inside. Replace the primer bulb and you should be ready to go.
Re: outboard motor fuel line theory
On your motor, the fuel pump mounted on the engine pulls the fuel from the fuel tank. The fuel tank must be vented so that a vacuum is not created in the tank. The primer bulb is used to fill up the carburetor(s) prior to starting.
All the prmier bulb does is get fuel to the carb to start it. Once running the fuel pump takes over and draws fuel into the carbs. Primer bulbs will go soft when the engine is running. The reason is when you pump the bulb you are pushing fuel and creating pressure. When the fuel pump takes over you are drawing fuel ( in essense deflating the bulb). SOunds like you have a bad fuel pump.
Re: outboard motor fuel line theory
The system is simple. Before starting the engine, priming the fuel system via the primer bulb fills the system with fuel and expells air through the carb vent. Once the engine is started and the fuell pump uses fuel supplied through the fuel hose, a very slight vacuum is formed in the hose and is replaced with fuel from the gas can. If all connections are tight AND the primer bulb check valves are working, this is a very efficent system. more
I honestly thought this would be a 15-minute job, but it turned out the project took two weekends and pushed my frustration meter to yellow. But we probably learned more with this tricky installation than we would have from a easy job. Our subject boat is a 2001 Crestliner 1700 Super Hawk, powered by a 2001 Evinrude 70 four-stroke, which is really a Suzuki DF70 with blue paint and Evinrude decals. Suzuki (www.suzukimarine.com) supported this project by donating a filter kit. Suzuki offers two filters kits, the standard size (P/N 99105-20005-ASY, $71.95, $23.95 for a replacement element) and the compact size (P/N 99105-20006-ASY $60.00, 19.95 for a replacement element).
Installing a 10-micron water separator/fuel filter is worth the effort.
I think a lot of offshore fishing boats are coming equipped with factory-installed fuel filters, but I'm not seeing them on many inland fishing boats. I was just looking at a new Lund last weekend, for example, that did not have a filter. And of course, there's a huge fleet of older boats out there with no filter other than the small screen on the motor, including the Crestliner belonging to my buddy Arlyn. And because I might go fishing with Arlyn, I don't want his motor to conk out from a fuel problem. So I proposed that we use his boat to demonstrate how easy it is to install a good fuel filter.
The Suzuki compact filter is about half the size of the standard filter, and still rated for up to 140 hp (but not for V6 motors). This filter would fit below decks in the Crestliner. We were careful to make sure that we'd have enough room below the filter to drain the separator to check for water, and to change the filter. An electric screwdriver helped speed up the task of removing about 20 screws to loosen the side panel and about three-quarters of the deck. We found we could lift the deck up enough to reach the tank fittings without removing it completely. more
I brought this connector but it doesnt fit in the hole its to big.
Re: Mercury 9.8hp fuel line connector more
Hi there, I had exactly the same problem with a 6hp Merc60 (1968 model). WHen you take a quick look at the fuel connector it is easy to miss the fact that there are 2 sizes of this style of mercury fuel fitting, and they are almost identical but NOT interchangeable. [links]
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