No water pressure when connected to city water.

[Kevin D Pem]

I just checked the water pump and all lines going to and from it. There isn't any attached parts that could be considered a check valve.

the back flow valve is in the water connection then. You should be able to remove it from the outside.

 

[carlos6466]

I'm a little confused here. In your initial post, you said "I removed and replaced the one way valves (back-flow valves) on the end of the inlets as one was defective yet water still is only a trickle." If one or both of those replacements was installed backwards (what I think @Gronk is getting at), it would stop water flowing in. It is all-too-easy to get those things in backwards; been there and done that even when I was being really careful.

TJ

The new unit I replaced did not have a back-flow preventer. The old one did... So, just in case, I ordered the replacement without that internal mechanism.

Also, the city water fill hardware has female garden hose on one side and male 1/2" NPT on the other. It can only go in one direction.

While I still would love to fix this issue, I've decided to connect the water to the lowest-point drain which is basically a "T" along the PEX tubing so I can have use of city water at an adequate pressure.

I've also come to the conclusion that I can't snake a wire through the tubing to try to break up the thing that could be causing a blockage as there are too many 90° bends and turns.

 

[TJ&LadyDi]

I'm afraid I have run out of ideas. Good luck in solving the problem.

TJ