Need help with fuel pump issues
#1
Need help with fuel pump issues
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?