Hi I have a 2010 flex fuel truck that I just installed a walbro 400 pump into.
I used a 1998 corvette regulator and plumbed it in above the tank and put a bulk head fitting into the hat to return fuel to the bucket.
The stock internal passages on the bucket were bypassed and the pump feeds the filter direct. Its working great and holding 54psi with 625rwhp on a mustang dyno. The only problem is that I am getting a P0231 and can not turn it off. The tune has the code and shows it off but it comes on everytime the truck is started. Any ideas?

Thanks

Nolan

 

How did you wire it? With the FCM power supply or a hotwire?