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Author Topic:   1993 Rage
sailnphotog posted 03-10-2004 08:57 PM ET (US)   Profile for sailnphotog   Send Email to sailnphotog  
My Rage is powered by the Yamaha 650. My question is related to the fuel system losing "prime" after the engine has been off more than 5-10 minutes. It will start, run for about 15 seconds then cut off. I then have to squeeze the primer bulb several times and then it will start and I can get underway. However, If I close the tank vent after I shut the engine off, I don't have a problem if I start up later unless I have been sitting for quite a long time. I have replaced the fuel tanks which helped (One of the original tanks would not hold a prime no matter if I closed the vent or not)

Could this be a carb problem? By the way, I replaced the primer bulb also. It is supposed to have a check valve on both ends.

Thanks for any help!

RJM posted 03-10-2004 09:52 PM ET (US)     Profile for RJM  Send Email to RJM     
Welcome aboard! Very good question. My 150 Mercury (sometimes)does the same thing. Hope some of the experts on this board can help us out.
sailnphotog posted 03-11-2004 11:20 AM ET (US)     Profile for sailnphotog  Send Email to sailnphotog     
RJM
After I posted my problem, I read the "primer on primers" listed on the home page of this site and that may be helpful to me, won't be able to try it out right away...i.e., keeping the primer bulb vertical to let gravity help out the little check valve flapper to prevent fuel draining back...I'm just not sure that is the problem, need some expert opinions.
RJM posted 03-11-2004 12:29 PM ET (US)     Profile for RJM  Send Email to RJM     
sailnphotog,
I reread that section and think I will purchase a new Mercury factory bulb and see if it makes a difference. Thanks
WHALER27CC posted 03-14-2004 12:32 PM ET (US)     Profile for WHALER27CC  Send Email to WHALER27CC     
Sailnphotog-
A couple of things you may want to look at. Check the fuel lines to make sure you are not losing any pressure from any of them, it wont take much of a split to cause a problem. Has the fuel filter been replaced lately? It almost sounds like the fuel will pass through only when its being forced through, whether it be by built up pressure from the vents being closed or by the bulb being squeezed.Lastly spray carb cleaner into the carbs, it just may be that they are sticking. If none of that works , it probably is time to get the carbs rebuilt, especially if you have been having alot of fuel probs in the past, they may be too gummed up at this point. Good luck .
Peter
sailnphotog posted 03-15-2004 02:46 PM ET (US)     Profile for sailnphotog  Send Email to sailnphotog     
Thanks for the ideas! Any and all are welcome! I am wondering about the fuel lines...I am going to inspect closely with a good light...the filter is almost new. The carb is really my suspicion...there is some pitting in the throat and I have found an almost new carb at the local yamaha dealer. I will advise on how it all comes out in a couple weeks after I get it installed, inspect all lines closely and have time to test on the water!

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