Could also be water in the fuel.
Check the sump portion of the fuel filters for evidence of free water
..... then be sure to wet the filter cartridge O-rings/seals with fuel
when you reseal them - a possible source of bubbles in Larry's posting.

Flat seals on filter cartridge housings are notorious 'leakers' and
must be installed 'wetted' with fuel oil so that you insure that they
seal.


In article .com,
" wrote:

Thanks Larry. I've looked really hard for air leaks and fuel leaks...
The fuel tank is higher than the engine and I have bled the thing very
well. I'll look some more, but don't understand why it would get
better when it gets warm... Also, if the engine has been wamed up
sometimes it doesn't have the problem the next day... If it was the
injection pump would it ever run well?

-- Tom.

Rich Hampel wrote in news:290320062253232580%RhmpL33
@nospam.net:

Flat seals on filter cartridge housings are notorious 'leakers' and
must be installed 'wetted' with fuel oil so that you insure that they
seal.


I'd have been with this all the way, but he's not pulling a vacuum on the
tank as the tank is higher than the engine. If the gasket were leaking,
his bilge would have fuel in it.

I'd like to see that water test, too. Way too many boaters are too eager
to get back to the dock with guests and leave the poor thing sitting there
with half-empty tanks to breathe the water in every night. They don't want
to be bothered buying 8 gallons of fuel, so the tanks get to breathe and
the problem starts. It's so easy to prevent water in the tanks. It's not
in the fuel you buy at all.