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Author Topic:   Engine leaking gas
prxmid posted 08-02-2003 11:53 PM ET (US)   Profile for prxmid   Send Email to prxmid  
I have a 15 Whaler 1987 with an 89 Evinrude 70, just had it serviced, new water pump, impeller, etc.

We put in in the water today and am keeping it in the water for three weeks.

Used it twice today and both times when the engine was raised after use, there was a large gas slick around the boat. Couldn't see an obvious leak, It may have been leaking into the bilge area and then released. The second time as soon as we stopped I disconnected the gas line from the engine, same thing happened. It eventually stops. Anyone have any idea where it could be coming from?

Steve Leone posted 08-03-2003 01:40 AM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
Sounds like your carb bowls are draining out when you tilt up. This is normal. If you do not have VRO (oil injection) or if you have disconnected it you can run the gas out of the carbs. You will need to unhook the fuel fitting at the motor and run it out of gas at high idle (1500 rpms). You need to check if you have gas in your bilge. One cup of gas ariated is equal to 6 sticks of dynomite. Steve
prxmid posted 08-03-2003 09:40 AM ET (US)     Profile for prxmid  Send Email to prxmid     
Thanks Steve, sound like it is the carb bowls. By "normal' do you mean most carbed motors will have this occur when they raise their engine? Seems like every marina would be closed due to EPA violations.
jimh posted 08-03-2003 12:05 PM ET (US)     Profile for jimh  Send Email to jimh     
One solution is to not raise the engine. I generally leave the engine down if I an staying overnight at a dock. I don't see any sheen on the water. This is in cold fresh water, perhaps not as much of a source of corrosion as tropical salt water.

When I pull the boat and trailer it, I may raise the engines. I guess that gasoline spills on the highway.

Jamie 20 outrage posted 08-03-2003 12:31 PM ET (US)     Profile for Jamie 20 outrage  Send Email to Jamie 20 outrage     
In case you are mistaken and it isnt gas, take a look for a leak from your trim/tilt system.
prxmid posted 08-03-2003 12:51 PM ET (US)     Profile for prxmid  Send Email to prxmid     
I'll check tilt/trim, but it smells like gas. I guess I could leave it down but I'm afraid of growth. It will be in three weeks straight until I have a lift installed. I was just commenting on Steve Leone's use of normal. My other boat has the 'dreaded'Optimax. No gas leak.

If this is normal, no wonder the push from the gov't to four strokes.

andygere posted 08-03-2003 04:30 PM ET (US)     Profile for andygere  Send Email to andygere     
Tilt your motor, but get some fuel absorbant pads to soak up the mess.
Jamie 20 outrage posted 08-03-2003 05:16 PM ET (US)     Profile for Jamie 20 outrage  Send Email to Jamie 20 outrage     
Why not pull the cover, clean up what you can with paper towels around the pans, then tilt it up and watch. It may be really obvious. Also after cleaning up, pump the bulb and again watch as you keep pressure on the bulb and see if fuel is squirting out. This should not be too hard to figure out....I hope.
prxmid posted 08-03-2003 06:59 PM ET (US)     Profile for prxmid  Send Email to prxmid     
Good idea, I should have thought of that.
jimh posted 08-03-2003 08:40 PM ET (US)     Profile for jimh  Send Email to jimh     
The tendency of a carburetor bowl to spill gas when tipped is more a function of the law of gravity than of the engine power cycle (2-stroke versus 4-stroke). A 4-stroke engine with a carburetor may be subject to leaking gasoline from its bowls, too. It depends on how far the engine is tilted and exactly how the carburetor is designed.
Steve Leone posted 08-03-2003 09:16 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
It is normal but may need attention. The 1987 70hp O.M.C`s are equiped with a "spill" line from the bottom rear of the front cover. There is suposesd to be a hose that is connected to a bleed nipple on the crankcase half to "recirculate" the spilt oil/fuel mix. Yours has probably split or fallen off or both. They used a poor grade hose for this application. If you replace the hose tie strap it on either end. his should remedy your problem and ease your concious. Allthough there are more light oils and petroleum distalates getting into the waterways via rained on streets and pavement. Plant a big tree in the middle of the road if you really want to change things.... Steve
Steve Leone posted 08-03-2003 09:18 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
ps Or the cover gasket has been compromised. Steve

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