why?

[Papa John]

is the chemical jug suction hose pumping out water instead of drawing it up? The chemical injection hoses are pulsating.

 

[Jim Pemberton]

is the chemical jug suction hose pumping out water instead of drawing it up? The chemical injection hoses are pulsating.

What is the brand/model machine you're using?

 

[Josh Wood]

It sounds like you need a new diaphragm.

But what do I know?

 

[SamIam]

is the chemical jug suction hose pumping out water instead of drawing it up? The chemical injection hoses are pulsating.

Hole in diaphragm or bad check valves

 

[Mikey P]

is the chemical jug suction hose pumping out water instead of drawing it up? The chemical injection hoses are pulsating.

On a 370 or your Gavinmount?

 

[Papa John]

370.
there was a leak in the top port of the flow meter-- so Maybe that was the issue. I'll find out today.

 

[Papa John]

Hole in diaphragm or bad check valves

I'll check if The flow meter isn't the issue.
The water pump has 3300 hrs and I've only done oil changes. maybe a rebuild is in order?

 

[Papa John]

What is the brand/model machine you're using?

370

 

[Papa John]

It sounds like you need a new diaphragm.

But what do I know?

I don't run chems through my chem meter/machine. So I would think the diaphragm would last longer.

 

[Jim Pemberton]

I don't run chems through my chem meter/machine. So I would think the diaphragm would last longer.

The opposite:

The diaphragm is getting hit with pressure from the water pump to move the chemical through. When the other side is "dry", it is forced to flex further and is more rapidly damaged. Prime in straight water to put water onto the opposite side of the diaphragm, but keep the meter off.

Or remove the entire chemical pump and you won't have to deal with the issue at all.

You probably also have a bad chemical check valve, which would be why your having water come out the hose.