"Calif Bill" wrote in message link.net...
"Mr Ranger" wrote in message
...
Thanks Calhoun, You would think manufactures would make it easier to
pick the proper replacement parts. On the pump there is no identifiable
marks at all. I was able to find the correct pump by comparing pictures
on the net. It is a carter for a 350 Merc. I did notice that different
pumps had the window you speak of, however this one does not. I did not
see any others for my engine that would fit, so I assume I have the right
pump. I plan on changing it tomorrow. Is there any way to look at the
one I take off and tell if it is bad?

Thanks, Mr Ranger



"calhoun" wrote in
:

That's a lot of gas has to be the fuel pump. You would notice bad
engine performance if that much was getting past the rings.
Don't some marine fuel pumps come with 2 diaphragms with a sight glass
between the two so you can see if there is a leak. Are you sure you
are using a marine pump?



When you take it off, leave the fuel lines hooked up and work the actuator
arm. See of fuel is squirted from the mounting area cavity. Marine pumps
have line from the vent hole on top of the pump to the carb / spark
arrestor. That way, if the diaphragm ruptures on the top, instead of the
gas flowing out to the bilge, it goes to the carb.

Since the writer stated that he took 5 trips of twelve miles, and the
oil level went up one quart, you'd never be able to see gas "squirt"
from the cavity by working the lever manually. If he averaged 30 miles
per hour, that would be two hours of running, at let's say 3500 R.P.M.
Since the fuel pump must pump at least once each revolution, that
means the lever is actuated some 420,000 times. That would result in
..00000238 quarts per action, or .00007619 ounces per each stroke. That
would most likely be imperceptive using your method.