need help!

[93 gmc_350tbi]

My 93 k1500 with the 350 the right blinker stopped working with the lights on the when I shut off the lights it work again I tried checking the fuses I looked for a wire shorting out I gave up and tried starting the truck and it won't fire only if you put a little gas into it will fire for a secondu I can't hear the fuel pump running and I tried the fuel pump relay no good luck any help with be thankful

[DOCBAWRENCHTURNER]

So the truck only starts if you pour a little gas into it, correct? I would suggest that you have someone crank the vehicle over while you watch to see if the injectors are pulsing.