Just replaced my fuel pump on the old S10. It's the first time I've done it and everything seemed to go alright, but now my engine is shaking severely and it still seems like it's struggling.

Is this just a timing issues or does it sound like something's preventing fuel from getting to the engine still? I did have to replace a little bit of fuel line and put a new filter in...

Any guesses?

 

What brand of pump was it? It's entirely possible you got a dud, especially if it's an Airmax or something.

 

It was an AC Delco.

 

Sounds like it's time to check the fuel pressure. Are you sure the fuel pump was the problem and it was not the fuel pressure regulator/ spider assembly leaking? How long has it been since it has had a tune up? More into is needed pretty much or we are just throwing money at guesses and not diagnosing the problem.