How To Fix Air In Fuel Lines On Your Outboard Motor

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Here’s some different methods of finding the cause of air in your fuel lines on your outboard motor!
Plumb in a clear piece of hose into the fuel system, as close as you can to the VST tank. Somewhere after the primary fuel filter. Monitor the hose for the presence of bubbles while the motor is being run at high power. Or, have someone pump the primer ball continuously while the motor is being run at high power.
Air bubbles are caused by any air leak on the vacuum (suc‑ tion) side of the fuel system from the fuel tank pick‑up to, and including the lift pump. If there is an air leak in the fuel system, air bubbles will be present in the clear cover of the Fuel Pro.
Insert the clear hose into the fuel line, prime up the engine, and start it up! Let it run for a little while and carefully watch the fuel passing through the clear hose. If you see a ton of air bubbles coming from the boat fuel tank side of the hose, then we are hot on the trail to solving this issue!
I hope this helps you
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Опубликовано:

19 июн 2022

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Комментарии : 33

@SkilltradeMarketing 27 дней назад

When you press wound the air pressure your creating vent out the vent? It's not a closed system because it's vented

@jaredrhodes7288 11 месяцев назад

Very practical and helpful video. Thank you

@jayvette75 Год назад

3 MONTHS I have been causing this PROBLEM THANK YOU !!!!! I replace 2 carbs and had the same problem and now I know why . I changed the fuel sending unit and ever since I have had problems.. %$%@&%^@)(I))!%^$^@^% AIR IN THE LINES !!!!! I am so happy I saw this. I made 20 post on a boat forums NO ONE EVER came up with this WTF !!!!! ' THANK YOU AUSTIN!!!!!!!!

@fishingwithaustin8258 Год назад

Always start with your fuel system, work one end, to the rear, then use a separate fuel tank , always start cheapest. TROUBLESHOOT TROUBLESHOOT TROUBLESHOOT before buying new parts, I’m so happy and thankful you fixed your problem, thank you for watching

@drewramsey7255 2 года назад

Thanks, great video!

@fishingwithaustin8258 2 года назад

I hope this helped you!

@JoseLara-bv2oj 10 месяцев назад

Great video brother

@fishingwithaustin8258 10 месяцев назад

Thank you so much for watching

@bouldernelsonbigfoot 11 месяцев назад

Great Vid. i have same issue .Used permatex fuel resistant tread sealer ,bad idea. Sealer ended up in Water Serparator.

@fishingwithaustin8258 11 месяцев назад

Oh Jesus that’s tough atleast the separator caught it before it went into the motor

@ericjockers3045 Год назад

Hey man, when your engine bogged down did you prime the bulb and it did the engine maintain rpm/speed? I have a similar issue and have down everything but fueling lines.

@fishingwithaustin8258 Год назад

Your engine can maintain a certain speed or rpm when there’s air in the fuel lines because it can supply fuel up until a certain limit where fuel air ratio tops out before imbalance from too much air. If it’s a four stroke, have you tried the fuel injectors? Just replaced mine and a quick way to diagnose them is a short I uploaded on my channel

@ericjockers3045 Год назад

Hey Austin. I found you on IG and sent you a video of the symptoms. But I think I fixed it today following this video. I replaced the lines from Tank to F/W separator (also took out the fittings cleaned them, applied better tape around threads and tightened them down good), replaced the line from F/W separator to priming bulb and from priming bulb to inline fuel filter; bypassed this line out of the rigging tube because I keep boat on water. Ran like a champ. Fingers crossed that’s all it is. Pulling the boat out tomorrow to properly replace the line. Hit me up on IG and appreciate your service!

@morroccomtayamo6530 Год назад

Am having trouble with air bubbles in my Diesel filters - pliz help

@fishingwithaustin8258 Год назад

Can you explain the problem

@DatSavannahLife Месяц назад

How can you blow bubbles if you have the tank vented? 🤷🏻

@fishingwithaustin8258 Месяц назад

Say what

@karlkoops2142 Месяц назад

So if you see air in the clear filter bowl in the engine area that’s a problem?

@fishingwithaustin8258 Месяц назад

@@karlkoops2142 if you prime your bulb and have fuel leaking out of it from the fuel pressure yes it’s an issue

@FishinFool70 Год назад

Fuel sender gasket is not going to get air in the fuel line. You more then likely were getting air through that corroded up fuel line fitting on the tank. Should have changed that.

@fishingwithaustin8258 Год назад

The gasket had a lump in it where it was leaking air, I took it off and cleaned all the build up off of it and put it back and it became flush after tightening the fasteners on it, for that situation it was the gasket

@fishingwithaustin8258 Год назад

Also love that username

@samoliveira6598 Год назад

@@fishingwithaustin8258 Hi Austin, I am thinking the same thing as FTW688. The sending unit gasket is above the fuel LEVEL line. The fuel pick up is submerged in the fuel so the air leak would have to be in theory somewhere between the pick up to the motor. There are a lot of sources where air is exposed to the system before it hits the tank, for example the fill cap is not 100% sealed, the vent....well that's self explanatory. As far as I know there is no back flow prevention valves from the vent to the tank. So with those 2 examples I can't see how a small leak in the sending unit gasket would allow air in the fuel lines with the pick up being submerged in the fuel, Are you following me? I am going through the same thing you are right now with my 2011 115 Yamaha, its driving me crazy. I have changed everything and still the same issue. Only thing I have not done is replaced or bypassed the water separator. When I hook up an external take it will reach full RPM and works like a charm. Clearly sucking air from somewhere. BUT WHERE!!!!!

@labernese 10 месяцев назад

Exactly, if the vent is functioning properly you will not create a vacuum in the tank as fuel is consumed. If the vent is blocked and even a small vacuum is formed air will find a way into the suction side of the system downstream of the tank.

@robbyddurham1624 5 месяцев назад

I agree with the other guys about the seal around the sending unit and that it might have been the elbow fitting. I'm having the same problem and I'm pretty sure the problem is in from of the ball pump and might be the same fitting on mine. I don't think the gas caps are sealed or the vent isn't sealed, so the problem has to be in the fuel line somewhere between where the pick up is above the fuel level. Oh, mine eventually seals up and works all day after I keep the fuel pumped up for about 15 minutes while running. I can see the air bubbles moving in the clear tube I added in from of the ball pump.

@bh5094 Месяц назад

How would a leaky fuel sending unit gasket cause the engine to run bad? I mean the tank is vented. Wouldn’t that gasket leaking air just be the same as another tank vent?

@fishingwithaustin8258 Месяц назад

Too much air isn’t good either

@bh5094 Месяц назад

@@fishingwithaustin8258 i just resealed my sending unit the other day. I’ve been having problems with my engine bogging down as well. I will take it out Friday and see if the problem is fixed. I really don’t see how it could be but I hope you are right. Either way thanks for the video. Good info

@fishingwithaustin8258 Месяц назад

@@bh5094 the thing is there’s a pick up tube, no air needs to go through that. Air needs to come into the tank so it doesn’t implode. When the tank empties it needs to fill with air so the tank doesn’t suck itself inwards

@bh5094 Месяц назад

@@fishingwithaustin8258Austin I was very skeptical about the sending unit gasket leaking causing my engine to big down and eventually run like crap. In my thinking the gas tank is vented anyway so how could this sending unit gasket cause this problem. I drained my VST and noticed large bubbles of air in the clear tygon tubing drain line. I pressure tested my tank and found a substantial air leak at the sending unit gasket. I replaced the gasket and was pleasantly surprised. The engine runs perfectly! I don’t understand why or how this caused the problem but it obviously did. I want to thank you for this tip and want to apologize for doubting you. Thank you!

@bh5094 Месяц назад

Did it fix the problem?