16:1 air fuel ratio....bad!

[nasty93notch]

i a running a 255 walbro intank pump. it started breaking up and puttering on low end. i thought it to the local dyno my air fuel started at 16:1 came down to 13:1 then went back up off the chart then jumped all over the place not staying steady or even coming down close to rich. i've tried a fuel pressure test at idle it makes40psi as soon as i hit the throttle it goes down to about 35psi...maybe bigger pump ?

[blown1989saleen]

whats your combo? injectors size etc.


Scott

[nasty93notch]

42lb injectors, fmu, 8" crank pulley, 255 in tank, new aeromotive fuel pressure regulator..12lbs of boost

[blown1989saleen]

42lb injectors, fmu, 8" crank pulley, 255 in tank, new aeromotive fuel pressure regulator..12lbs of boost

if youve done a pressure test and it DROPS, then either the 255 isnt enough or it is failing. i recommend a 255 inline along with the 255 intank, get the GSL392 NOT the t-rex. you better be watching out for the symptoms of a blown HG as those A/F #'s are dangerous to be flirting with.


Scott