crank no start when i stop at the store and come back out it wont fire i have fuel pressure spark but no injector pulse after it sets for 10 to 15 it will this has been going on for two months when it dont want to start i can give a shot of starting fluid it will start and run fine unless i stop again

 

I ran to this problem. Turned out the fuel pump was so rusted out that I had to clean the gas tank and replace the whole assembly.