Need some help. Starting problem, maybe fuel issue?

[PBK522]

1990 K5 blazer, gas, 350, fuel injected

So I've been out of the country for 3 months and when I got back my truck wouldn't start. It cranks beautifully but won't get going. I think it might be a fuel issue since it was lagging a bit before I left and I changed the fuel filter right before i left.

I guess my question is, does anybody have any ideas about where to start trouble shooting thiis one. Fuel delivery is something I've never worked on that much

Also does any know where i can look to see if I'm getting good fuel deliver

Any help would be great

 

[R72K5]

can you hear pump pumping fr a few seconds right after trning key to ON position ?

i would loosen the largers of the two fuel line son backsid eof TBI unit and turn key on and see if fuel comes out real good or not

if not then fuel relay or pump is gone

if has fuel then its either no fire, or no injection signal to injectors,

go from there