Fuel Flow Question ????

J

jmarshall8

Cadet
Joined
Sep 27, 2008
Messages
9
My 90 Hp 4 Stroke Mercury (2000) runs great at slow RPMs. When I accelerate to wide open throttle it runs great for about 30-45 seconds then begins to cut out. When I pump the bulb the motor catches up and runs great for another 30 -35 seconds. Then the same thing. At lower RPMs (3500) everything is good. I have looked over all the fuel line connections and changed the inline filter. Sounds to me like I may have a pressure leak somewhere. Where should I go from here?

Thanks....
 
H

hamit59

Petty Officer 2nd Class
Joined
Jul 25, 2008
Messages
149
Re: Fuel Flow Question ????

Might want to look at your fuel pump or for air leaks either would cause the same problem. You did not say if it was a carbed motor or efi if it is an efi. I would look at the low pressure pump first.
 
mthieme

mthieme

Captain
Joined
Oct 6, 2007
Messages
3,270
Re: Fuel Flow Question ????

...should be carbureted.
I concur...classic fuel pump symptoms.
Check your primer bulb too - is it old? any cracks in it?
 
G

gss036

Commander
Joined
Jan 18, 2003
Messages
2,914
Re: Fuel Flow Question ????

When was the last time you checked/changed you fuel/water seperation filter? If they are really dirty or almost full of water, you will also get those symptons.
 
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