Newbie Pump Question

So as newbie I can’t post in the pump forums. I had a question about pumping and tube sizes.

Can tube size effect the pumped length?

Let me try to describe whats going on. Before my PE journey I bought a cheaper pump that had a small battery operated pump. I used it in the past more for fun than any actual purpose. Recently I’ve decided to try pumping and invested in some more equipment. So with the basic pump it had a 7.5” x 2.25” tube. The new pump (LeLuv) has a 9”x2” tube with a hand pump and gauge.

With the Basic pump I am touching the end of the tube (my BPEL is 7.5”) and under vacuum my glans is somewhat mushed against the end of the tube. When I got the LeLuv setup I went with the 2” tube because I wanted to focus on length first. Just going by feeling when I used the leluv pump I estimated that the basic bump was pulling between 7 and 8hg. At 7hg on the LeLuv I was barely passing 7” on the ruler. I increased to 10hg and got to 7.5”.

So long story short, is the slightly thinner tube on the Leluv somehow restricting length? Should I stick with the current tube and work on length that way or should I get the next diameter size tube for the leluv and see if that improves the current lengthing? Any other tips?

Thanks!

Two things seem likely.

The basic pump/tube was at a higher inHg than you think. You could a relatively easy test to see what’s what by putting the old tube standing upright in water and see how many inches of water it lifts above the level of water it’s standing in. If you remember dimensional analysis from school, it shouldn’t be hard to do the conversions to see how many inHg your old pump is pulling.

More likely though, your pumping lube isn’t good enough to prevent friction. Olive oil is what most pumpers use. I made up my own glycerin, water, and l-arginine powder recipe. Glycerin by itself has to be dilluted with water to avoid osmotic damage to the skin. I add the arginine powder to create a molecular particle gradient with the glycerin to keep my skin from sticking to the tube, though you could add many different powders to get the same effect.