My car does not have power.i did have it serviced and changed the feul pump aswell and still the same result. what could the problem be?

No what you are describing is lack of air through the intake.
Rich means lack of air or too much fuel. Fuel pressure remains constant and drops when the accelerator is pressed down if the pump is bad, the fuel filter is plugged or there is an injector problem or a fuel pressure regulator issue (if one is present) and this results in lean running engines.

check for battery voltage at pump plug.2seconds for fuel pump all the time for gage' if you have power change pump

Here's where it's at. here's what it look's like.

there may be a safety shut off switch that has been activated.

It depends on your services, the filter change and the quality of the feul. In bad conditions you can kiss it within 50 k or it can last for up to 500 k. A feul filter change is prety important.

Have you checked for battery power and ground at the fuel pump? You could have a blown fuse - especially if your old pump was shorted.

this could be a number of problems,check the voltage with a volt meter,not a test light at the fuel pump connection. make sure you have 12V,if so unhook the fuel supply line,turn key to ON not START, and make sure the pump will continue to flow,( obviously cqatch the fuel with a pail,or put a hose on it to pump it into a pail,don't let it leak all over the place.)if the pump continues to flow with out shutting off,your pump,filter,and electrical for your pump is ok.it could be a restriction in the return line,or the regulator may not be functioning.un hook the return line as close to engine as possible,install hose on it and route to a pail to catch fuel,with supply line hooked back up,start van and see if it works,if it keepd shutting off,you've now eliminated return line problems.check the regulator.

If there is no power to the fuse block then there has to be a main relay check that to see if it is blown. it is usualy located in the fuse block undr the hood.

if this happen when traveling at a constant speed it could be feul related.check feul pump pressure and replace feul filter

Had a similar problem before. Change the feul filter. This often fails due to sand in gas and limits gas being pumped into your turbo. If you change this and the cars runs fine, eventually you will have to change the feul pump. Do the feul filter first. It's cheap and easy.