I have a mountain bike that my brothers left me. the tire in the front is a normal s valve, the one in the back is a presta valve. now this was ok because it was fully pumped up, but then it popped on the road, so i got a new tire ad put it on and was all ready to pump it up but when i tried to pump it no air would go in. so i looked at it a while and i figured out the top unscrews, so i unscrewed it and put the pump back on and started pumping, but after a while i figured out that no air was going in the tire and now i'm very confused.
You have to re seat the pump nozzle and try again. Sometimes you have to push down on the valve to unseat the stem, it gets stuck fast and wont let air in.
no longer understanding the make of motor vehicle i won't be able to be particular. A valve cover is a straightforward bolt on area. maximum engines won't require an outstanding form of different areas to be bumped off yet that may no longer consistently the case. purely get rid of the bolts/screws protecting the valve cover on and carry it off.
Be careful pumping prestas. If you're not using a pump with a hose, much back and forth movement of the valve stem will cause it to split. In fact, that may have already happened and that's why no air is going in the tube.
A presta valve can be a little finicky. If you don't push the pump nozzle down far enough, it won't let the air into the tube. Unscrew the valve, line up the pump head with the valve stem, push down firmly while twisting back and forth. Try pumping; if it builds up pressure, just push it down until it releases into the tire. Don't forget to pull up the lever on the pump nozzle.
