Every time in the past that's what I've found but this is the 4th fuel pump I've had on it and it acts exactly the same way. Of the 4 pumps 2 were new (1 Carter HV and this Edelbrock HV) and 2 were used (1 Carter HV and 1 Holley HV). The used Holley pump came off a buddies low 10 second race car. Worked fine on it when he took it off so I'm sure it was a good pump.
Been looking around for a cheap HV electric pump to put back by the tank and bypass the mechanical pump and see if that solves the problem. I'm also going to rig up a temp fuel pressure gauge that I can watch when I'm running it to verify that's the issue. Find it hard to believe it's anything else since the AFR meter goes full lean, but I think it'd be good to positively verify it.
