MONSTER GN
Member
- Joined
- Dec 22, 2008
Im having an issue with my 87, I have good fuel pressure at idle and while driving normally with no boost. I have it set at 45PSI. But when I start to hit boost (which btw isn't happening until 3,000 rpm, but that's another problem) but either way when I start to hit boost the fuel pressure does OK, then when it tries to hit hard the fuel pressure drops to 20PSI. could this be caused by surging and giving the MAF False readings? i don't quite no where to look or what could cause this, but this slow/no boost is driving me insane. A few things ive already taken care of is exhaust leaks, i have no plumbing leaks (that im aware of under pressure), and all vacuum leaks have been taken care of. But i guess lets stick with my fuel pressure issue and go from there. It is a new pump from ac delco, but considering swapping it out with a 255LPH pump, but im pretty sure ill still have the same issue, because even the factory pumps weren't this bad, something else has to be going on here. any help and advice you guys could give would be greatly appreciated, thank you very much