If you can block the return (disconnect and plug both halves), and then pressurize the supply side with the 5-or-so PSI, and leave it that way for a week, you might find the leak via a small puddle forming. With that configuration, any air at the leak will eventually find its way out (assuming the leak will happen at that pressure), followed by fluid. I had a "small" leak form on the draw side of my pump (between the nipple and housing), which showed no real signs (sounds, etc) during operation, but I noticed the small puddle on the floor, as the leak was below the oil level. Pressure with plugged return would suit for higher points.
That said, most if not all of your higher points are under positive pressure during operation - no signs of leakage resulted while operating? Also, I wouldn't expect foaming to be a result of a leak on the high-pressure side of things - only on the draw side, including pump seals/body. There were (before the shaving cream ;-) ) no signs of wetness anywhere on the draw side?
That said, most if not all of your higher points are under positive pressure during operation - no signs of leakage resulted while operating? Also, I wouldn't expect foaming to be a result of a leak on the high-pressure side of things - only on the draw side, including pump seals/body. There were (before the shaving cream ;-) ) no signs of wetness anywhere on the draw side?
