mjr46

for a 347 30's are fine

sushi214

One more quick thing. Not sure I quite understand how the pressure could be up but not the volume. If the pressure never drops shouldn't there be enough volume going through?

silver91gt

pressure is a measurement of restriction, volume is how much fuel is moved.
the fuel pumps in a 5.0 puts out around 70-90psi, the regulator then lowers that to 42 or whatever you set it to, your fuel pressure regulator should be set without the vac line on it (WOT). check to see if theres a vaccum line on the fuel pressure regulator.

stock pumps are made for stock cars. I had 30# injectors with a 255lph in tank pump with a 233lph inline booster pump and my 347 went lean anytime I would spray over a 200 shot.

sushi214

I'm not going to be running any gas. I just bought a Walbro 255 lph pump. Hopefully this does the trick. Also what kind of damage could be done to my car at this point after running the car so lean? I've run under 1,000 miles on it but did 3 pulls on the dyno and romped on it a little bit. Is there anything I should take apart to look at or any kind of tests to do to check for damage?

sushi214

Also what kind of pressure should I be running with this pump?