low pressure tire cleaner

no product is being pumped from lower tank to the upper mixing tank.Changed foot valve/tube not obstructed/motor runs/cleaned inlet strainer/guage reads 50 product & 30 air/water enters at a very slow rate when hydrominder float is depressed/meter tip orange has been replaced.Question why am I not getting suction in the lower tank to bring the tire cleaner solution up to the mix tank?

Normally hydrominders come with a strainer on the water inlet where you hook the hose to it. If I understand your post correctly you're saying you aren't getting the chemical draw to mix with the hydrominder. If the strainer is clogged it will slow the flow to a point where it won't have the suction to draw the chemical. If you haven't done so, unhook the water line to the hydrominder and check the strainer there. When you say you cleaned the inlet strainer I wasn't sure if you meant on the hydrominder or the tank so maybe this will help.

Newer Hydrominders come with plastic valve parts. I've found that when they go bad it won't flow enough water and it can't draw chemical. Definitely check the strainer (If your Hydrominder connects via a garden hose fitting it will probably have one), and if that's not clogged remove the black plastic cap that covers the valve. If the stem is plastic, get a valve kit and replace it.

Try a replacement diaphragm they're just a couple of bucks.

If it has a brass stem already that might do the trick, but if it has a plastic stem and it's not flowing full volume a replacement diaphragm alone will either be a temporary fix or do nothing at all. I don't know what it is about the plastic ones that makes them so bad - I'm just glad the kits still have the brass ones.

I've had far, far better reliability by replacing the whole valve kit instead of just the diaphragm. It's just a couple bucks difference.