I overlooked the part of you having the walbro 255, my bad. I was just pleasantly surprised with the 525 as I had expected it to be fairly loud.

Blog Post Radium's Ultimate Fuel Pump Test

My DW is very quiet, and low amp draw, so these are reasons I wanted one.

It wont support big power, but it will make 400hp NA on E85.

Keep us updated, usually when taking things to others and these issues happen then I would ask the OP to take it back to that person and have them at it. Usually as well those that end up taking the work know how to on these installs (hopefully) and are able to get it fixed.

The reason why it's popping off after the right measures are taken is excess pressure from the pump.
With a fuel pressure gauge you'll be able to confirm this theory and can point you in the right direction as to what next.

My twin 450's are not even noticeable. You can barely here my one pump running at startup.

Right. I believe the 255 is the only one that uses the vane system.

If that is like an old Bosch 044 then that thing was noisy as hell.

Chatted with seb - after putting on dyno - I’m 30hp off where I should be. Getting it drilled tomorrow and fuel gauge installed and then Seb is retuning it.

I’ll keep you posted.

Hey, I recently installed a 340lph aem fuel pump as well. I had issues for a while with the fuel line coming off and now I’m having issues as well with the wiring. What did you use to connect the wires? And what did you use for the line?