I still have, for the most part, a stock 5.3 from a 2008 Tahoe in my 88 K5 Blazer, so we're talking 330 to 350hp at most. I do have some JBA headers that give it a little more, but not much.

Anyway, I have a pump I bought from Summit that dropped into the Blazer's stock sending unit fine, and I've been running it for about 7 months now. It puts out 90 psi, and I've always noticed that the truck is running rich. I think this is bad (Disclaimer: I'm not a professional mechanic!)

Is 90 psi for my setup too much? Can/will this cause problems, and if so, what?