Walbro 255lph acting up, (noisy, fixed!) in Fuel Delivery Posted June 29, 2009 HiThere's this 240z l28et with 255 walbro that im looking at, but it has a starvation problem. Idle's fine, but when driven it is rough, boggs down, running lean. It has a secondary pump ( not sure what brand) that feeds the walbro. The seller says that the pump might be bad. I was wondering if i can use the 240z or 280zx fuel pump as the secondary. i can't find the spec for thhose stock pumps, as i read that the carter pump you used is 5psi. So im wondering if i have to buy that one or some other pump. Would be easier for me to use the fuel pumps that i have around though ( the 240 and 280zx). thanks I would say look for a pump that is good at creating suction from the tank. The Carter sucks very well from the tank, provides a ton of volume, but not much pressure. If your feeder pump is shaped the same as the walbro, I would say that it will not work as well. The two pumps perform entirely different functions. The carter will provide 72 GPM, or for higher output you could look into the Holley pumps (blue, red, black).