tmxmotorsports
SILVER Star
Or regulate it before the 62 regulator it may just be easier to just go with the 3fe fuel pump if your planning an ls swap and you will have the other pump on hand if you need to switch it out.Ok I did some troubleshooting tonight. Installed a fuel pressure gauge. At idle it holds 50psi and the pump is silent. When I blip the throttle the intake manifold pressure drops, which lets the fuel regulator ramp up and my gauge pegs out to the mechanical limit and stays there - which is well above 80psi (where the gauge numbers stop).
I removed the return line at the tank and let that feed into a gas can to make sure there were no return restrictions… there aren’t.
I did a bit more than that, but the conclusion is that the stock regulator can’t drop enough pressure/flow for this pump. I think the fuel line pressure is too high causing back pressure on the pump which is causing the whine. It’s consistently dead quiet until I blip the throttle.
So at this point I’m thinking I’ll just get a 3FE pump and I’ll have to address the pump again when it’s time for the LS.