Never heard of a primer bulb on this engine either. As to 3000 rpm, this
engines top end is 3800 if I remember correctly.
Gordon
"trainfan1" wrote in message
...
Butch Davis wrote:
This is an outboard, right?

A 250 Cubic Inch 165 hp outboard by Mercruiser? No... this is an I/O
with a Chevrolet-based I-6 engine... which is why I question the
"pumping the fuel bulb" part of the problem...


Have you serviced your fuel filter lately? Has
any fuel system work been done recently? Is your fuel tank built in?
If
so, perhaps some condensate has accumulated in the bottom and needs
removal.
If a portable tank have you tried completely emptying the tank to ensure
no
water is present? When did you last replace the primer bulb and or
rubber
fuel hoses? Over time these parts can become pretty soft and will suck
air.
Sounds to me as though you are getting a dose of water in your carb(s)
at a
particular trim angle when barely on plane, ie. a steep trim angle.


2500-3000 rpm is moving at a pretty good clip with this engine, full-on
plane.

Rob




the mention of fuel in the tank.

Good luck with the problem.

Butch
"trainfan1" wrote in message
...

alfred pettersen wrote:

I am having an intermitent problem with this engine in my boat.

When I run at around 2500-3000 rpm and do some modest "wave hopping" in
Southern Georgian Bay, occassionally my engine just "dies" (stalls).

When I restart it and give it some throttle, it behaves like it is
either
"fuel starved" or being "flooded".

Gotta figure out which one. It sounds like a fuel bowl level/float
valve
problem, maybe in combination with a weak fuel pump and/or vapor lock.
Are you running your bilge blower?

Usually, the "fix" involves stopping the engine, opening the engine
cover
and pumping the fuel bulb until line pressure is restored,

I have never seen a primer bulb on a Mercruiser - how did that get
there?
This may be part of the problem... you may be sucking air into the fuel
sytem at the clamps, or the check valves are sticking or broken... the
bulb being there at all may be a sign of a previous problem...

Rob

Sorry, missed the part about the CID. The bulb took over my brain. At any
rate, I continue to think of water in the tank as a strong possibility but
other things could also be causing the problem.

If the engine fuel pump is functioning properly I'd lose the bulb. BUT, if
there is water in the tank the bulb could be a way to pump it out.

Did you say the fuel filter/water separator can has been checked for water
and there was none?

Strange problem. Everything I think of is shot down by the narrow RPM range
at which the problem manifests. If you are wave hopping any sediment in the
tank bottom would be stirred up and enter the fuel suction but the filter
should catch it.???

You might want to check the carb and intake mounting and gaskets and
retorque the nuts and screws. It might also help to run a couple of cans of
carb cleaner through the system.

Wish I had more to offer.

Butch
"Gordon" wrote in message
...
Never heard of a primer bulb on this engine either. As to 3000 rpm, this
engines top end is 3800 if I remember correctly.
Gordon
"trainfan1" wrote in message
...
Butch Davis wrote:
This is an outboard, right?

A 250 Cubic Inch 165 hp outboard by Mercruiser? No... this is an I/O
with a Chevrolet-based I-6 engine... which is why I question the
"pumping the fuel bulb" part of the problem...


Have you serviced your fuel filter lately? Has
any fuel system work been done recently? Is your fuel tank built in?
If
so, perhaps some condensate has accumulated in the bottom and needs
removal.
If a portable tank have you tried completely emptying the tank to
ensure
no
water is present? When did you last replace the primer bulb and or
rubber
fuel hoses? Over time these parts can become pretty soft and will suck
air.
Sounds to me as though you are getting a dose of water in your carb(s)
at a
particular trim angle when barely on plane, ie. a steep trim angle.


2500-3000 rpm is moving at a pretty good clip with this engine, full-on
plane.

Rob




the mention of fuel in the tank.

Good luck with the problem.

Butch
"trainfan1" wrote in message
...

alfred pettersen wrote:

I am having an intermitent problem with this engine in my boat.

When I run at around 2500-3000 rpm and do some modest "wave hopping"
in
Southern Georgian Bay, occassionally my engine just "dies" (stalls).

When I restart it and give it some throttle, it behaves like it is
either
"fuel starved" or being "flooded".

Gotta figure out which one. It sounds like a fuel bowl level/float
valve
problem, maybe in combination with a weak fuel pump and/or vapor lock.
Are you running your bilge blower?

Usually, the "fix" involves stopping the engine, opening the engine
cover
and pumping the fuel bulb until line pressure is restored,

I have never seen a primer bulb on a Mercruiser - how did that get
there?
This may be part of the problem... you may be sucking air into the fuel
sytem at the clamps, or the check valves are sticking or broken... the
bulb being there at all may be a sign of a previous problem...

Rob