Need help ASAP….We have a Delta Single Lever faucet in our kitchen that as of yesterday lost water pressure. It has an aerator built into our PUR filter which I removed to check if that was the problem. There was some sediment built up, but with the entire filter and aerator removed there is still no pressure. Every other line in the house, including the bathroom toilet and sink in the next room over function perfectly. Can anyone suggest where I can look next to possibly fix this problem?
Checked the valves under the sink….doesn’t seem to be a problem there.
As far as a cartridge is concerned, I am not quite sure there is one….when I removed the housing I found the metal ball beneath the cam and the support springs (which all seemed fine). I am in the middle of trying to run a thin plumber’s snake through each side (hot and cold) but it makes little sense that I should lose water pressure on both lines, right?
Okay….under last suggestion pulled up spout and found diverter…how do I know if it is stuck and if stuck how do I make it unstuck? It does look like there is a build up of sorts so should I use a cleansing agent (like CLR) to brush it up?
New development…
Checked diverter….found some strange black stuff (rocks? rubber?) blocking its movement. Removed the blockage. Went back and reassembled faucet by the letter…springs and all…turned water back to full open on both valves and used the top of the faucet ball to turn on water…water came out full blast and let it run for two minutes to be sure…reattached lever handle (had some trouble here) but turned water on again and the pressure went for about ten seconds before disappearing altogether…barely a dribble. Went back and checked for blockage at diverter again and none found. Followed steps back to reassemply and got pressure for ten seconds before it seemed as though lever (or something inside it/beneath it) came loose again and pressure left. I know I have tightened everything properly so where could the problem be? The lever AND the diverter maybe?

my kitchen faucet has lost lot of pressure all of a sudden. I did clean the aerator twice…no luck. And do not have a side spray. the faucet is the kind that you push a button to make it spray also. the problem is with both hot and cold water. incidentally this all happened when one of our pipes sprang a leak. the rubber washer deteriorated on an pipe supply line in the garage (where the water comes in from outside) and we had that repaired immediately but the problem with the faucet started at the same time and still persists. The pressure everywhere else is still the same (as before the leak). So what i can’t figure out is what is the relationship between the leak and the kitchen faucet only. And why is the faucet still messed up after the leak was repaired. We have checked all the valves to make sure they are open all the way. Showers upstairs have same pressure as before. Bathroom sink and toilet on same level as kitchen are still functioning as before too. This one’s a mystery!