Water Pressure Problems, 2002 Mercury EFI 200

I have a 02 Basscat Pantera Classic with a 2002- 200 hp Mercury Efi on the back. I have been having problems with my water pressure . When I go up on plane for a few minutes with some speed my water pressure is low and the alarm goes off, and I have to stop . I changed the water pump and impeller today, and took her out for a test run. For the first few minutes everything was great, pressure was where it was supposed to be and moving on the water. After a few minutes pressure dropped and alarms go off again and boat seems to overheat. Please please, any thoughts or ideas to correct this problem. Please do not tell me a cracked head or something like that... HELP....

DR.,

Check the poppet valve..Sounds like its dumpingfresh cool water when it should be sealing..
..

Jay

thanks Jay will do..

replaced the poppet valve and pressure is great. no alarms BUT, when I hit 67-68 mph on the gps alarm goes again. stop the boat for 20 seconds and continue on my way again.now what is the problem. is it the thermostats from getting to hot. HELP...

How high is your inlet water pick ups on the gear case from the pad ???

Jay

thanks for the reply Jay. I will measure, and at the same time I will drop the jack plate about half a inch to see if this makes a difference

What did you find as I have the same problem. 2001 200efi at WOT for about 3 minutes or more I get the overheating alarm. I am 3 1/2" below pad

I put scoops on mine. Went from 14lbs to 26.

Where would one find thesed scoops?

Don Weed, European Marine down in the 3.0L Mercury Forums.

When trouble shooting only change one item at a time, helps to figure out what was happening and not add another item to the problem.

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by arjone01 &raquo;</td></tr><tr><td class="quote">I put scoops on mine. Went from 14lbs to 26. </td></tr></table>

This was the cure for my problems as well.

Scott at 3 1/2" below pad on your Ranger you should be carrying 17 - 20 psi. When did you change your pump?

<table width="90%" cellspacing=0 cellpadding=0 align=center><tr><td>Quote, originally posted by Tom Rollins &raquo;</td></tr><tr><td class="quote">Scott at 3 1/2" below pad on your Ranger you should be carrying 17 - 20 psi. When did you change your pump?</td></tr></table>

Not sure what I have yet as I only have run it once and it was up there for sure. I had almost 8 to 10lbs at idle