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Old 11-03-2003, 04:47 AM
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Default Outboard primer bulb intermittently gets filled with air bubble.

My primer bulb intermittently gets air in it. This causes the outboard to stutter and die. If I stand back there and squeeze it like crazy to get all the air out then the motor runs like a top. This problem is MUCH worse when it's hot out. Anything above 80 degrees and this is a real problem. What gives? Things I've tried. 1. Replacing the bulb. 2. Replacing the fuel line from the gas tank to the bulb. 3. Putting new fuel water sep on. 4. Tightening all the hose clamps in the entire system. It still does it. Any feedback would be helpful. Very frustrated. Paul aboard Amanda Too
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Old 11-03-2003, 04:54 AM
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Default Outboard primer bulb intermittently gets filled with air bubble.

have youy tried keeping the ball horizontal? Might mean adding some length to the outboard line. Some act up if they are hung vertically from the engine. I might also try another brand ball. (they are cheap).

good luck.

Chris
1800 Parker (I think)
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Old 11-03-2003, 05:10 AM
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Default Outboard primer bulb intermittently gets filled with air bubble.

If you getting air in it; you have to have a leak. Have you checked the fitting on the tank? How about the pick-up in the tank; broken or cracked? How do you know your getting air; bulb not gettin hard? Very frustrating problem!

Boston Whaler, "MUMBLER", 24' Outrage, twin 175 HP Evinrude Ocean Pros. Snowball, the cat...
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Old 11-03-2003, 05:28 AM
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Default Outboard primer bulb intermittently gets filled with air bubble.

Sounds like the pickup in the tank is cracked or looseat the head where it attches to the thru tank connector. Try running on a protable and see if it clears up.



Hawkeye
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Old 11-03-2003, 10:07 AM
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Default Outboard primer bulb intermittently gets filled with air bubble.

quote:have youy tried keeping the ball horizontal? Might mean adding some length to the outboard line. Some act up if they are hung vertically from the engine. I might also try another brand ball. (they are cheap).

I have read the opposite. The primer bulb is meant to be mounted in a vertical mode as recommended by the manufactuer due to the check valve in the ball.

Your problem sounds like it may be difficult to locate.
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Old 11-03-2003, 10:26 AM
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Default Outboard primer bulb intermittently gets filled with air bubble.

Be sure the fuel/water separator is screwed on tight. Listen to it while you squeeze the ball. I had this problem on my Pursuit a few years back and it drove me crazy. It seemed tight, but it did take a litle more tightening and problem solved. It did not leak fuel, but it did let air in.
Be sure the tank is vented right. If it's not, it can air lock. Not getting enough air and cuts off the fuel flow. Loosen the gas cap and see if it still happens. If it doesn't stall, check the tank vent. Sometimes critters build nests in the tank vent on the side of the hull and clog it up, especially on trailered/yard kept boats. Usually, easy to tell when you squeeze the ball, it won't respond or re-shape quickly. If it takes lots of squeezes to prime it, definitely an air leak.
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Old 11-03-2003, 10:26 AM
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Default Outboard primer bulb intermittently gets filled with air bubble.

round2it ... it shouldn't make a difference which way the bulb is mounted. It's a one way valve. When you squeeze it, one ball opens the other closes, etc.

Boston Whaler, "MUMBLER", 24' Outrage, twin 175 HP Evinrude Ocean Pros. Snowball, the cat...
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Old 11-03-2003, 11:04 AM
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Default Outboard primer bulb intermittently gets filled with air bubble.

i had this problem on my 1994 scout.
the primer ball would not hold the fuel and when
running the boat would just shut down and stop.
very upsetting when crossing in front of other boats and you just stop.
heres what i can remember:
1. changed the bulb,make sure its connected to the proper side of the bulb,incoming/outgoing fuel.

2.on some tanks there is an anti siphon valve at the tank,it stops the fuel from going back into the tank after you have drawn it out.
see if you have one.

3.if your tank is not venting correctly be sure it is,or go to larger inside dia fuel line.

4.and this is what my trouble was,THE FUEL PUMP. mine was not drawing correctly,when i changed the pump problem solved.

i hope this helps you out,i was there too so i know what your going through.
if i can help further just ask and ill try to remember more.
ttcups,scout 175 dorado
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Old 11-03-2003, 01:39 PM
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Default Outboard primer bulb intermittently gets filled with air bubble.

Mumberlone, here's some good info for you and might help out in this situation.Primer Ball 101 if you will. I know I learn lots by reading various forums. This was a post written by Dunk, a pretty good mechanic it seems.



"There seems to be way to much confusion on here about these simple things, in this case fuel primer balls.

The all have arrows on them indicating the direction the fuel should flow through them.. The have two one way valves in them. When mounted right with the arrow pointed toward the engine the valve on the tank side closes when you squeeze it, this forces the fuel in the ball towards the engine. When you release it the valve on the engine side of the ball closes and the tank side valve opens and fuel is pulled out of the tank by the ball pulling itself back in to shape. The reason why they work better with the arrow pointed up is because the check ball in the lower valve rolls forward and doesn't seal the opening when you squeeze the ball. This lets fuel flow in both directions when you first squeeze the ball, so you loose part of the squeeze till the ball is pushed into place. With the ball pointed slightly up this keeps the check ball in the upper valve against the seat and keeps fuel from running back out of the engine. This is why when I rig a boat I put the ball right in front of the engine where it can hang down slighly in the right direction.

If the ball goes flat while you are running the engine then you have fuel restriction between the the ball and the tank. Most likely dirt at the fuel pick up pipe opening in the tank or the anti siphon valve on the tank. Anti siphon valves are used to stop fuel from siphoning from the tank if the fuel line ruptures and the rupture is below the fuel level in the tank.

When you prime the engine with the ball you are filling the carbs with fuel. The carbs have floats that control a needle valve. When the carbs are full and the floats are up the seal off the fuel flow and the ball get's hard. At this point the carbs are overfull, but it makes it easy for choke or primer to feed fuel to a cold engine like this. At normal running level the carbs will not stay this full. This is why the ball doesn't feel hard when the engine is running. At this point to will be able to get another squeeze or two in before they are completely full again. Same thing after you shut the engine off.

If you can squeeze the ball more than twice after the engine has been shut down,,, then you may have fuel pump problems or the floats in the carbs are stuck. If this happens all carbs have vents in the top of them and priming farther with the ball will push fuel out of the vents.

Now as far as EFI and DFI engines they all have some kind of resevior(sp) that the high pressure pump feeds off of to feed the injectors. This works the same as the carb bowls and has some kind of float that works a valve that shuts off fuel flow when it's up to it's proper level.

Really the easiest way to understand these things is to take the valves out of primer ball and just look at them. OMC and Merc always sold just the valves alone and could be replaced, but what's the point it's just easier to buy a new primer ball. Becarefull when you buy new primer balls because they come in 3 different sizes for different size hoses, 1/4", 5/16" and 3/8's...
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Old 11-03-2003, 07:25 PM
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Default Outboard primer bulb intermittently gets filled with air bubble.

round2it... thanks, very interesting. I've had them apart, not much to 'em.

Boston Whaler, "MUMBLER", 24' Outrage, twin 175 HP Evinrude Ocean Pros. Snowball, the cat...
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Old 11-04-2003, 12:09 PM
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Default Outboard primer bulb intermittently gets filled with air bubble.

Seaswirl, if you are using Tempo primer bulbs change them for an OEM bulb. A bad bulb creates problems that can lead you in many directions as you try to solve the problem.
Good luck!
PJB
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