Some of my fragrances come out the gun and some don't. It seems the ones that don't come out of the gun are leaking around the 1/8" compression fittings. My combo VAC's are IVS. There are several compression fittings leaking on my fragrance and shampoo VAC's. Should I replace all the fittings on these? Is it possible to pull new 1/8" lines through the house to the gun or should I replace the whole assembly?