Pneumatic Technic Car Help

[TechnicRCRacer]

Hi,

I have been trying and failing to make a small pneumatic car wth two cylinders that when air is pumped into an air tank, and a valve is released, the car will roll along a flat surface. Any ideas?

Parts that I have:

2 (or 4) of the not-V2 style large cylinders

1 x Airtank

5 valves and 2 old style valves

NOTE: I bought some small pumps, but they were all faulty.

[aeh5040]

You need to make a pneumatic engine and attach it to the wheels. Below is a fairly minimal example (among many others).

But it will not go far on the contents of a single air tank. For that you need to use a larger non Lego bottle, as below, or else many many  air tanks.