I just installed a 255 walbro fuel pump

my afrs are really lean, the motor struggles to idle, it worked earlier really well but doesnt seem to want to keep the car running? I was boosting all day long on the stock pump and wanted to tune tonight with the new pump

I am 100% sure I installed it right and did many fuel pump swaps...

is the pump going bad I guess? I had it in my room for nearly a year without any use until today, and i bought it used

 

Check the fuel pressure at the fuel rail and compare it to the stock specification.

 

yeah, might be. check volume and pressure.

But most likely the pump since it has been used and sitting for a year. Seals dry out. If it was even a pump that ran E85, your lucky it spins, they usually seize up after a month.