Air Leak?

[rkersh409]

I think I have an air leak some where in my fuel system on my 1995 Evinrude 175hp motor. Every time I stop for more then 5 minutes I have to pump up the bulb. If not the motor will crank fine but when I go to take off it stalls out.

Last night I notice that when I am pumping up the ball fuel was dripping from the carb area on the starboard side of the motor. Should gas be spilling out when pumping up the bulb? Also where could the gas be spilling out of?

Thanks,
Robert

 

[rickdb1boat]

Re: Air Leak?

Fuel should not be dripping when you pump the bulb and the bulb should stay somewhat firm anyway. Have a helper pump the bulb while you look closely for the leak...

 

[Silvertip]

Re: Air Leak?

Fuel leaking from a carb indicates the inlet needle and seat are not shutting off the flow of fuel and its simply overflowing. Could also be a float that has become saturated with fuel and is not shutting off soon enough. If the engine is tilted too high when priming, you may also lose fuel. Sort of like a full cup of water running over when you tilt it. Stalling generally points to carb issues so if they have never been rebuilt, its probably time. Obviously though, do the simple and inexpensive checks first.

 

[clint]

Air Leak?

The Rear Admiral is right, check for all the simple repairable issues, clamps, hoses, maybe? Also fuel pump gasket? When was the last time you rebuilt your carbs? Float possibly could be stuck open and fuel flowing out? My 140 evinrude was doing same thing till I found bottom carb drain screw was loose from vibration? Your fuel bulb seems to be putting gas to carbs but with air seeping in from somewhere it will lose prime almost automatically. Fuel lines break down also over time. Let us know how you make out with checks?
Clint 8)

 

[rickdb1boat]

Re: Air Leak?

Last night I notice that when I am pumping up the ball fuel was dripping from the carb area on the starboard side of the motor.

Look at the primer solenoid real close. They tend to leak at the cap or small hoses in back of it...

 

[rkersh409]

Re: Air Leak?

Could this be two separate issues? Or could it be the leak causing the air leak?

I don't know if the carbs have ever been cleaned. I just bought the boat a few weeks ago. Its nothing major right now, because the motor runs good. Its just a pain to have to get back there and pump it a few times every time you take off. I have even tried to push in on the choke to see if that would work, no luck.

Thanks for all the good info!

 

[clint]

Air Leak?

Just be sooo careful because of the leakage. Not only the smell of gasoline but if it leaking is in the interior, it could accumulate and be dangerous with out you knowing. Even at the motor with all that heat and with the cowel cover on, your fishing trip could be your last! Make it a priority to have a friend over to let him prime it up tight and use a strong flashlight and try to find it as soon as possible. Just a friendly safe suggestion! Good Luck!
Clint :^

 

[rkersh409]

Re: Air Leak?

Well it looks like it might be a float problem in one or two carbs. I can sit and pump the bulb all day long with out it getting firm. I can hear gas being shot into a carb. Except it never leaked out till I trimmed the motor up just a bit. Looks like a carb rebuild in the future.

 

[Silvertip]

Re: Air Leak?

The reason fuel didn't run out until you tilted the motor is because it was running into the motor. Fix it now or pay dearly later.

 

[rkersh409]

Re: Air Leak?

Is there a float and needle in the vapor separator? If so shouldn't that shut off the flow of gas to the carbs? Because it sounds like that is where the squirting sounds are coming from. But then again the carb should stop it to. Do I have my theory correct?

 

[rkersh409]

Re: Air Leak?

Okay I am totally lost now. Tonight I took the gas lines off of the fuel rails and plugged them off. And I was still able to pump the bulb with out it ever getting firm. Where could it be leaking fuel at. I looked in my manual and the evaporator separator has a float and needle. Could that be where its spilling fuel and leaking air? Any help would be greatly appreciated!

Thanks,
Robert

 

[rickdb1boat]

Re: Air Leak?

Just for grins, have the arrow on the bulb pointing up toward the sky(Vertical), pump it and see if it firms up....

 

[rkersh409]

Re: Air Leak?

I turned the bulb up with the arrow pointing up in the sky, with same results. I might be explaining it wrong. The bulb gets firm but when I continue to squeeze with continues pressure the bulb it never stops. It will deflate all the way down. And when I stop when its firm it will loose prim after about 5 minutes.

By plugging off the gas lines going to the intake manifold, shouldn't that be taking the carb's out of the equation? Does the gas come from the manifold and go into the carb's bowl?

 

[rkersh409]

Re: Air Leak?

Tonight I took the hose off of the check valve, and pumped up the bulb. A steady stream of gas came out of the VRO 2 pump. I guess the check valve is letting the gas into the crank case. My question is should it be doing that?

 

[rkersh409]

Re: Air Leak?

Where can you find repair kits for the VRO 2 pump?

 

[dingbat]

Re: Air Leak?

Here is the VRO test procedure.
http://www.maxrules.com/graphics/vropics/VROflowchart.JPG

Should you need it a rebuild kit can be ordered from your local dealer. I called around locally today looking for one and end up ordering on line.

 

[rkersh409]

Re: Air Leak?

After weeks of trying to track down the air leak I think I finally fixed it. I took the fuel bracket off and hooked it up to a 6 gallon tank I have to see where it was leaking. When I primed it up I held for a few minutes. Then I seen a mist of gas come out of the vapor pump.

So I replaced the needle and seat in the separator and the vapor pump itself. Along with the primer bulb (from the Evinrude dealer).

Now after sitting overnight its still firm. Now I need to take it out for a water test. Just to make sure its not bogging down by something else. Thanks guys for all the help. It was greatly needed.

Thanks,
Robert