How do you know that the pump is broken? Bad connections are more likely the culprit.
I exclusively use Leluv cylinders. Nothing wrong with them.
By order of likelyhood, you check for leaks:
1) The seal at the base of the cylinder contacting the pubic skin. Dry skin and/or pubic hair under the flange are likely culprit.
2) Check that the female quick connect fitting is screwed tight into the cylinder. Finger tight plus 1/4 turn is sufficient. This comes loose often so check it often. While there check the rubber o ring between the fitting and the cylinder is seated properly. If a section of it protrudes it my need replacing. Most hardware or big box stores will have a selection of o rings with which you can find a replacement.
3) Check that the male quick connect fitting is fully seated in the female quick connect fitting. Press and hold the male fitting into the female while pumping as a test.
4) Check the release valve (plunger rod) on the vac pump. It can stick open.
5) Check the hose for crackks or loseness where the male fitting slips in and also where the hose slips onto the hand pump. The hose should be tight and unable to twist it. If lose, cut off 1/2” and re attach.
6) Least likely is that the pump diaphram is leaking. The only time I have seen this occur is after pumping fluid through the pump which can/will damage the diaphram. I was unable to drepair it and bought another vac pump.
Initial: 7” BPEL; 6” NBPEL; 5.25” - 5.5” MEG
Current: 7-7/8” BPEL; 7-3/8” NBPEL; 8.5” BPFSL; 6.5” MEG; 6”x5” Flaccid.
Goal: Improved/consistent EQ while managing ED. Secondary: maintain current stats.