dmhandson

I have had a crazy time trying to figure out a new fuel pump set up . Went from a walbro 255 that died to a sx 600 lb hr pump and my tune went from perfect to ultra lean nothing has been changed but the pump shos same pressure on regulator but leans out under boost so I went in and added fuel to my tune and raised fuel pressure to get it closer but it's still leaner than I'd like under boost fuel filter is fine free flow is great it's driving me nuts any ideas?

68 SS

iTrader: (23)

Dirty/plugged injectors? Old pump could have introduced trash into the system when it died. I would get the injectors flowed/cleaned before running it anymore and risking burning it up.