When would u need an aftermarket fuel pump? Isn't the stock one sufficient enough? (For a N/A application) If not, what are the advantages if any to have lets say a Walbro 190 or something.

 

you don't need one for na unless it's built

 

really? Anyone else....

 

The stock fuel pump is sufficient for most N/A applications. If you need more fuel it is wiser to 1) increase injector size and/or 2) increase fuel pressure. Via a programmable ECU you can also change injector pulse.

All of the above would be recommended for a "built" application that requires more fuel than an OEM setup simply due to the fact that you are trying to make more power. (more fuel + more air = more power).

 

so a fpr and my stock ls fuel pump would be sufficient enough for up to 250hp maybe?