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RICHARD BRAUNS
New member
Username: old_farang
Post Number: 1
Registered: 07-2009
| | Posted on Saturday, July 11, 2009 - 09:51 pm: | 
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NEED SOME ADVICE AND HELP!
I'M A FIRST TIME POSTER SO THIS MAY BE LISTED TWICE. THIS ENGINE HAD BEEN RUNNING FINE WHEN PUT IN STORAGE. IT HAS NOT BEEN RUN FOR SEVERAL MONTHS AND NOW IT APPEARS TO BE STARVING FOR FUEL. WHEN YOU OPEN THROTTLE, PRIMER BULB IN FUEL LINE IS SUCKED FLAT!! I HAVE REPLACED PRIMER BULB,FUEL LINES AND CLAMPS. I HAVE CHECKED GAS PICKUP LINE IN FUEL TANK. LINE AND SCREEN ARE CLEAN.
ENGINE WILL RUN AT IDLE FOR AN HOUR BUT NOT MORE THAN FIVE MINUTES UNDER NORMAL OPERATING(LOAD) CONDITIONS. IF I RELEASE VACUUM ON PRIMER BULB AND PUMP BULB A FEW TIMES ENGINE WILL START IMMEDIATELY BUT WILL NOT RUN AT MORE THAN AN IDLE WITHOUT FLATTENING PRIMER BULB.
1 ALSO HAVE A FUEL/WATER FILTER IN THE FUEL LINE THAT IS REPLACED EACH SEASON OR SOONER IF NECESSARY. VRO HAS BEEN REMOVED AND ENGINE RUNS ON STANDARD FUEL/ OIL MIXTURE.
ANY SUGGESTIONS, ADVICE OR POSSIBLE SOLUTIONS FOR THIS PROBLEM IS APPRECIATED.
THANK YOU. |
Joe Reeves
Senior Member
Username: joereeves
Post Number: 7653
Registered: 02-2001
| | Posted on Saturday, July 11, 2009 - 10:05 pm: |
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The fuel primer bulb being drawn flat proves that the fuel pump is operating fine and has plenty of suction.
The problem is that there is a fuel restriction between the fuel primer bulb and the ffuel supply, usually the anti siphon valve as explained below.
(Fuel Anti Siphon Valve)
(J. Reeves)
Many of the later OMC V/6 engines incorporate a fuel restriction warning via a vacuum device attached to the powerhead. If the engine overheats, or if you have a fuel restriction, the warning is the same.... a steady constant beep.
NOTE... Only the V/6 & V/8 engines have the above "Fuel Restriction Warning". The warning horn will not sound on the other models.
The fact that a engine is not overheating, but the warning horn sounds off with a constant steady beep, and that the rpms drop drastically would indicate that the engine is starving for fuel due to a fuel restriction. Check the built in fuel tank where the rubber fuel line attaches to the tank fitting. That fitting is in all probability a "Anti Siphon" valve which is notorious for sticking in a semi closed position. It will be aluminum, about 2" long, and the insides of it will consist of a spring, a ball, and a ball seat. If this valve exists, remove it, knock out those inner components which will convert it to a straight through fitting, then re-install it. Hopefully that cures the problem.
The above procedure will cure a restriction problem with the anti siphon valve as stated. BUT, it may also allow fuel to drain backwards to the fuel tank when the engine is not running (siphoning backwards) due to the fact that the carburetors/fuel pump etc are higher than the fuel tank. This condition is not an absolute as the valves in the fuel primer bulb usually prevent this backwards siphoning problem. However.... if this does take place, the cure would be to install a new anti siphon valve.
Thousands of parts in my remaining stock. Not able to list them all. Let me know what you need and I'll look it up for you. Visit my eBay store at:
http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store
Bets not to type in all CAPS. It is considered SHOUTING and is difficult for some members to read. |
RICHARD BRAUNS
New member
Username: old_farang
Post Number: 2
Registered: 07-2009
| | Posted on Sunday, July 12, 2009 - 11:08 am: |
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To: Joe Reeves
Joe,
Thank you very much for the information on the fuel starvation problem on my 1995 70 hp Johnson.
I will check the parts tomorrow and then check your site.
In addition, thank you for the heads up on CAPS.
Thanks again |
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