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Author Topic:   70hp. Johnson Fuel/Air Bleeding

BugsyG posted 08-28-2003 06:33 PM ET (US)
Hi Everyone!
What a season it has been with me and my boat JAZZ. However I have replaced the spark plugs and the fuel filter. I am getting air somewhere in my fuel line.
This is the method to my madness:
To start it, I pump the ball and uncover the cowel of the engine and hit this manuel start (red) switch which releases some kind of air pressure and lets fuel to the engine and boom, it fires and keeps running. Which results in air somewhere.
Has anyone had this problem? If so, what do I do?
My gut feeling is this: I do believe that the fuel line is dry-rotted. Resulting in small cracks in the hose. May that be the problem, I will have it figured out. Please help. Thank you!
JAZZ
Jamie 20 outrage posted 08-28-2003 11:10 PM ET (US)
One way to quickly and positively do this is to add a clear piece of hose [like a foot or so] right before the fuel filter. I also add a T that goes to a fuel vacuum/pressure gauge. Then I bleed the air out, start it and just watch. The guage should never excede 4 inches of vacuum, and you should only have just a minimum amount of bubbles. If you have high vacuum, clean the antisyphon valve on top of the fuel tank, and/or clean or remove the tank pick-up screen [if you have one]. if you have low vacuum, but bubbles, start replacing stuff. Also if you have an aftermarket fuel primer bulb, replace it with a bombadier bulb. With alittle determination, this is pretty easy.
JohnJ80 posted 08-28-2003 11:40 PM ET (US)
Hose is cheap, so is a good primer bulb. If you are worried about it, why don't you just pull a new one thru anyhow? that would probably take as long as some of the other troubleshooting, it may fix your problem straight away. If you have dry rotted hose - or even think you do, you should replace it anyhow. Put in new tank and engine fittings (very easy to do) on the ends of the new fuel line.
A common place to suck air is at the o-rings in the fittings to the tank or the engine.
j
yankee posted 08-29-2003 09:11 AM ET (US)
Someone at Cedar Point must have a 6gal tank with an OMC hose you can use for an hour to determine if your leak is before the engine connection or after.

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Author	Topic: 70hp. Johnson Fuel/Air Bleeding
BugsyG	posted 08-28-2003 06:33 PM ET (US) Hi Everyone! What a season it has been with me and my boat JAZZ. However I have replaced the spark plugs and the fuel filter. I am getting air somewhere in my fuel line. This is the method to my madness: To start it, I pump the ball and uncover the cowel of the engine and hit this manuel start (red) switch which releases some kind of air pressure and lets fuel to the engine and boom, it fires and keeps running. Which results in air somewhere. Has anyone had this problem? If so, what do I do? My gut feeling is this: I do believe that the fuel line is dry-rotted. Resulting in small cracks in the hose. May that be the problem, I will have it figured out. Please help. Thank you! JAZZ
Jamie 20 outrage	posted 08-28-2003 11:10 PM ET (US) One way to quickly and positively do this is to add a clear piece of hose [like a foot or so] right before the fuel filter. I also add a T that goes to a fuel vacuum/pressure gauge. Then I bleed the air out, start it and just watch. The guage should never excede 4 inches of vacuum, and you should only have just a minimum amount of bubbles. If you have high vacuum, clean the antisyphon valve on top of the fuel tank, and/or clean or remove the tank pick-up screen [if you have one]. if you have low vacuum, but bubbles, start replacing stuff. Also if you have an aftermarket fuel primer bulb, replace it with a bombadier bulb. With alittle determination, this is pretty easy.
JohnJ80	posted 08-28-2003 11:40 PM ET (US) Hose is cheap, so is a good primer bulb. If you are worried about it, why don't you just pull a new one thru anyhow? that would probably take as long as some of the other troubleshooting, it may fix your problem straight away. If you have dry rotted hose - or even think you do, you should replace it anyhow. Put in new tank and engine fittings (very easy to do) on the ends of the new fuel line. A common place to suck air is at the o-rings in the fittings to the tank or the engine. j
yankee	posted 08-29-2003 09:11 AM ET (US) Someone at Cedar Point must have a 6gal tank with an OMC hose you can use for an hour to determine if your leak is before the engine connection or after.