Check Valve?

[Bruster]

On my Mastercraft the raw water pump impeller is above the water level. Is there supposed to be a check valve that keeps the pump full of water when the motor is shut off? Seems like that always starting the motor with the pump dry can't be good.

[T-REX]

My Lyman Had a Jabsco pump higher than tha water level, and it had a check valve in line between tha pickup and tha pump!!

[flabum1017]

If the intake hose rises above the pump at any point (such as feeding a cooler), water will stay in the pump enough for startup.

[Bruster]

Everything is below the pump and the pump is mounted so the inlet on the bottom. When it goes on the lift, most all the water drains out. I have a 1-1/2" brass spring check valve I'm thinking of putting downstream. I don't think it'll hurt.


If the intake hose rises above the pump at any point (such as feeding a cooler), water will stay in the pump enough for startup.

[velox]

Sometimes , to pervent a problem we create another un-foreseen problem.
I can see the check valve getting clogged and or stuck at some time in the future.
I would rather see you put a loop in the intake pipe of about 6 inches to hold water in the pump for starting.
My own 454 Chevy has a drop in the intake piping from the intake strainer to the pump and rises to the oil cooler on the discharge.
I have forgotten to turn on cooling water several times and run the engine for a fairly long time with no water . I was sure I has F ed up and pulled the pump apart to find the impeller perfect. the water in the loop has stayed enough t lublicate the impeller. I would not suggest anyone try this at home, but I dodged a bullet!

[Bruster]

I like that idea.

Thank You :cheers:


QUOTE=velox;1713104]Sometimes , to pervent a problem we create another un-foreseen problem.
I can see the check valve getting clogged and or stuck at some time in the future.
I would rather see you put a loop in the intake pipe of about 6 inches to hold water in the pump for starting.
My own 454 Chevy has a drop in the intake piping from the intake strainer to the pump and rises to the oil cooler on the discharge.
I have forgotten to turn on cooling water several times and run the engine for a fairly long time with no water . I was sure I has F ed up and pulled the pump apart to find the impeller perfect. the water in the loop has stayed enough t lublicate the impeller. I would not suggest anyone try this at home, but I dodged a bullet![/QUOTE]

[Charger200]

i agree a trap would be your best bet. a check valve will become plugged and inoperable verry quickly without the use of a strainer.

[Bruster]

I went to the hose supply and picked up a 3' piece of Parker suction hose. The hose is something new from Parker and it bends a pretty tight radius without much effort. I installed the hose with a loop to trap the water in the pump housing, installed a new impeller and discovered the muffler leaks. To much heat with this the impeller going bad burned out one of the inlets. Took the muffler off and repaired the damage. No leaks, motor stays cool, and impeller is always wet. Kids should be happy again.:thumbsup:

[velox]

It's almost always best to pick a passive solution rather than an active component to fix a problem.
Glad it worked for you.