I have a 93 gmc v6 manual, that happened to me the other day.
Hold the gas petal to the floor while you try to start it. Might sound
wierd but its worth a try, it worked for me.

Wow, that exact thing happened to me over the summer! (Don't know why
that's 'exciting' but, anyway) I was goin on lunch break and I left the
office (my '99 Z71 started up just fine) and went into the grocery
store and got some milk. Came out and tried to start and it fired for a
split second (or so it sounded) then died. I kept trying to crank it
but nothing happened. I had just replaced my pump and I was hoping it
wasn't just being ornery but it turns out it was the fuel pressure
regulator. It was really inconvenient having it in the grocery store
parking lot so just to get it out of the way I popped off the tube that
connects to the fuel line and stuck my thumb on it (and held really
really tight) while my friend turned the key. I only live a short
distance from the store so I drove it just enough to get back home and
park it. Ya don't wanna drive it more than you have to like that.
Anyway, I did some shopping around and found a good FPR for a good
price and then it was just a matter of popping off the old one and
popping in the new one. No need to take it to a shop, it's so easy a
cheerleader could do it (well....maybe). Good luck!

In Christ Alone