1997 GMC Sierra- won't start unless you put fuel in the throttle body, but runs good until you turn it off. You have to use the fuel in the throttle body every time you want to crank it. What's wrong? Any help would be great!

look into throttle body while cranking.see if you see fuel spray.if not, low fuel pressure of pluged fuel filter. also coolant temp or tps sensor could be at fault.have vehicle sensors scan tested for values..

sounds like a bad injector system there known for it

It is not receiving fuel you need to check your fuel pump.

if you can put fuel in throttle body and it runs. then it is not getting any fuel. check your fuel pump fuse and the relay, if ok, then you may have a bad fuel pump or a plugged up fuel filter. check filter and fuses first. good-day !!

fuel pump relay. ther 11.99. if thats not it check your fuel injectors. im 99.99% sure its your relay.

remove fuel line from throttle body and have someone try to start. If no fuel is "shooting" out of line, there is a block. clean out line or replace.

Did you change the fuel presure regulator located in the throttle body?

INJECTOR MAYBE?

next time it happens try spraying water in mist form around the throttle body if it bogs, replace the throttle body gasket. if it doesn't bog you may have a bad wire wait until dark start the vehicle have someone feed the fuel very slowly and watch for arching from a wire it will be easy to see when it is dark, replace that wire.

Have you check the injector relay or maybe a fuse for injectors.