One thing to do after you get the pressure working... we had what appeared to be really bad flow issues through our faucets. We ripped apart half the boat tracing every line thinking it was an issue with the pressure pump. My father-in-law finally figured it out. Each of the faucets had a screw off mesh filter on their tip. We unscrewed each one and found that they were badly clogged with debris. We cleaned the debris out and voila - the water came out at full pressure. Anyway, with your mention of debris in the system, you'll want to make sure your faucet filter tips, if they are on there (and we've found them on most every boat faucet we've looked at) are clean.