I made my own tester with a grease gun as the pump. Worked great and already threaded for 1/8 pipe threads. I cut the end off of a spare injection line to get the fitting, then drilled a 1/8 thread plug and JB welded the cut tubing into the plug. The only problem I had was in using vegetable oil; the seals in the grease gun failed after a year and it had to be replaced. I suggest flushing it out with mineral oil after use if you're using veg. oil.