1990 mazda b2200 fuel injection after about 30 min engine stops and in 20 min starts up ok until another 30 min and stops again spark is ok and fuel pressure seems ok ,engine will crank but seems like its totaly dead then I wait a 15 to 20 min and it runs like brand new.

No, they are part of the air injection system. http://www.autozone.com/repairinfo/repairguide/repairGuideContent.jsp?pageId=0900c15280076bfd

You may be getting a vapour lock in your fuel system. Disconnect fuel pipe from filter and check fuel flow. Take the car to a mechanic???

I think you have established that it is getting fuel but I guess what I would do is check into the throttle body itself.

I would try spark plugs and wires. If it was a fuel line you would see the leak or atleast smell it very strongly. If the problem still exists after new plugs and wires try the distributor cap.

Disconnected the battery for 30mins and then connected again.

When you turn the key to the on position can you hear the fuel pump turn on? If not, the fuel pump relay has gone bad. Make sure you have at least 5 gallons of fuel in the tank. Check and make sure you have fuel flow to the rail, try cracking the banjo bolt on the fuel rail.

You need to run a pressure check on the fuel line with the appropriate gauge.

My mazda b2200 starts and will stay running as long as the key is in the start position, but stops as soon as the key is turned from the start position

Try checking your Spark plugs (they MUST be the right type, clean, and properly adjusted: and try adjusting your timing. Either or both of these could cause this type of problem Hope it helps. If so, don't forget to rate the answer, will you?

i just bought an 88 that crazy overheated could only drive for 30 mins before had to stop. no leaks anywhere, did a compression check on the cylinders,checked out. no water in oil. took the radiator to a shop theyll do a flow test for free, got mine fixed for like 80 bux but you can buy a new one for 120. the white smoke might be your fuel filter