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1996 Mariner 175 hp

8/13/14 @ 4:14 PM
ORIGNAL POST
Musky99
User since 8/8/11
I cannot figure this motor out. Most of the time it runs fine, but other time it runs really rough. Main problems in the mornings. Starts up idles fine, runs slow fine. Then when you give it the gas it dies. Starts right back up, gas it and it dies. you could drive slow and will run no problems.

Once it gets going it will run fine and never miss.

Had it in twice over the last couple of years and no one finds anything.

any ideas?

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FILTER OPTIONS
8/13/14 @ 6:07 PM
Plmlk
Brent Hess
MEMBER since 12/18/07
From what you posted, sounds like a fuel delivery problem. Does not sound like spark, as you indicated that it will run at low rpm perfectly all day long...

Best guess based on the info. that you posted is first change the fuel filter, next guess is that the fuel pump diaphram is shot. After you change the fuel filter take your motor out and get on it, if it starts to quick gently pump the bulb on your fuel tank hose. If that makes it run better, rebuild your fuel pump...

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