If the float(s) are set too low in the carburator it could cause this
sort of symptom when the boat is pitching for and aft. Normally the
fuel level in the carb float bowl should be high enough for the jets
and passages to stay submerged in fuel at any boat position. But if
the pitching is violent enough or the float level is low that could
cause the jets to momentarily be out of the fuel.

The reason I dismissed the tank pick up is that in a normally
carburated engine the float in the carb decides when to let gas in. A
mechanical fuel pump is always pumping and even it is momentarily
unable to get pick up gas from the tank that would not be noticed at
the carburator unless you were close to full throttle and using a lot
of gas.

You never did tell us if it was carburated or fuel injected. I assumed
carburated but that would make a difference in diagnoses.

frank1492 wrote:
Thanks to you all for your ideas. At the present time. I tend to favor
the fuel solution. If it was electrical it would not be in exact "lock
step" with the hull's attitude. As to the question of whether it
occurs in the "stern up, hull down" part of the cycle or vice versa
I will have to check for certain, but I would guess that was the case.
As to the low fuel solution, the first thing I will do is check
to see if the guage is reading correctly. It currently reads 1/4 of a
tank but I have had trouble with the sensor before. It is entirely
possible that it's much lower.
Once in the past I had an issue where a piece of cellophane
was bouncing against the fuel intake in certain attitudes and speeds.
So I will look there next.
If it were something in the carburetor, what would it be?
And finally, the fuel pump was mentioned but I didn't quite
understand the implication.
Got a good calm morning here so will go out soon and get
started. Will keep you all posted!
Frank







On Sun, 30 Jul 2006 04:56:20 GMT, frank1492
wrote:

With each "push" of a choppy following sea, the Chevy V6 in my 22'
Grady White I/O seems to want to die. This also happens when the
boat gets into any kind of a repetitive wave pattern. It is as if
something cuts off the fuel supply as the boat surges forward, and
restores it as it goes up the crest of the next wave. (Something in
the fuel tank perhaps?)
If it isn't something in the tank, where else would I look? What-
ever, it is definitely a function of up-and-down hull motion.
Your help is much appreciated! Thank you!
Frank