ok so been reading lots of these threads but cant find one exactly like mine. I recently just got a 1995 blazer with vortec 4.3l cpi, turns over fine but will not start unless but gas in throttle body, but as soon as i put gas in throttle body starts up perfect and stays running just find idles fine when hit the gas its all fine just wont start up cold can turn it off after couple mins then i turn it back on and it will start. dont got much money so been trying look for someone with same problem as mine but cant find it if u can pls help me whould greatly appreciate it.

 

I had a Sunbird that did the very same thing. Check the fuses to the fuel pump if fuses are OK, it sounds like a fuel pump to me.

 

the person got it from said they change fuel pump and still chouldent fiqure it out chould not be true but is there anything else i can do before spending the money to change fuel pump also fuel gauge says is full all the time so does that have something to do to fuel pump to?

 

Was the fuel filter ever replaced on the vehicle? Possibly it is so plugged up full of debris it doesn't have enough fuel pressure to start the motor. Next check the fuses and/or fuel pump relay. If those are good crawl under the vehicle with a volt meter to see if there is 12 Volts getting to the fuel pump. The guy you bought the truck from said he installed a fuel pump? If so was it new or a junk yard special?? Also, check your grounds. I am asking those questions because your vehicles symptoms are identical to the Sunbird I had and it was a fuel pump.

 

ok thx im going try fuel filter this week and if not that ill go to fuel pump im hoping its not fuel pump.. but will there car stay running if it was fuel pump?