There must be an an answer to the problem of LOW water with multiple stage pumps while trying to run engines on trailer for tuning or flush out. My situation is with a two stage pump. My set up uses one stage for the engine and exhaust. The other stage for the intercooler. What happens is the intercooler gets 90% of the available water leaving the engines and exhaust just barely getting anything at all. My feeling is that no matter how much water I can get in there without the pressure the boat forces on the system the water is just going to the easiest shortest route, which is of course the intercooler. Any solution?

I'm a bit surprised. Lot's of views, but not one suggestion. There has to be a bunch of high horsepower boat owners on here with multi stage pumps that run in salt water and need to flush their engines after each use. what are you guys doing?

How about a ball-valve on the line to the intercooler? Or can you use hose pinch pliers to pinch it off? Or maybe even more rudimentary... if your thru-hull exit for the intercooler is brass or stainless; can you just pound a rubber cork into it when needed?

Pinch plyers was my first thought.

That's not a bad thought. I would have to think about that a little. I have a braided line to the cooler, so it would have to be something more permanent like an in line ball valve. Thanks........any more ideas? I have to think I'm not alone with this situation. Thanks again.

After thinking a bit I don't think that can work. You have the impeller turning in that chamber pushing water out. I don't think it would be a good idea to force the water back.

I`m surprised you`re running water thru the intercooler at idle, I`d run a adjustable relief valve and only run water thru the intercooler above say 7 psi.

http://www.cpperformance.com/p-976-w...ve-12-npt.aspx

I believe (if I am wrong please tell me!) that adjustable relief valve is used when you have a separate pick up for the intercooler. I chose not to do that and have just a single pickup.

Are you experiencing high engine temps on the hose or just worrying?

The engine does not usually need full flow to flush.

To be honest I have not got to the point of high engine temperatures as the headers get hot way before that is going to happen. There is probably a way to feed the engine while having the pump dis connected (belt off). I just haven't come up with it yet.