DW300 Fuel Pump Pressure Problem
 

Hello All, I purchased a DeatschWerks DW300 fuel pump a few months back. I used stock wiring and didn't modify anything other then the housing to get the pump in there. Everything seemed fine since I installed it. However, now that I am actually checking the AFR and Fuel Pressure on it (data logging and etc). I am noticing that it's dropping pressure from idle (58 PSI) to under 40 PSI WOT. *This is not a problem under normal situations with my NA engine. Now that I am running nitrous on it, it's has become a huge problem. *I purchased DW pump because I am running e85 and they have a 3 year warranty. They even checked in house on a 370z to make sure it worked for me. But I don't think they tested under WOT with a pressure gauge.... *I checked my battery voltage, soldering, hoses, clamps, npt, an fitings, tried a few things, looked for leaks and etc. *Haven't found anything that would cause such a drop in pressure. I also spent a ton of time on myg37 and 370z forums. *No solution as of now. *If anyone has any suggestions or a solution. I am all ears.


Video of the issue:

https://www.youtube.com/watch?v=U6DvBf92E5Q

Hi,

When I installed my walbro fuel pump for the Stillen supercharger, I had to drill through one of the Jets so that it would flow more. There was a provided drill bit for this. Perhaps someone who is a fuel expert can shine in on some more info?

My initial thought is the fuel required at WOT is not being met because of the restriction. But, I'm not an expert. Just my .02

OP, you need to talk to phunk. He's the go to guy on fuel systems. :tup: