I have a twin intank and the entire system is run by a single 20amp fuse built by a well known vendor.

Its a twin intank pump (walbros) the pumps both run at the same time. No hobbs switch. I had the system in another car and was very reliable. I switched cars and moved the system in the same type of car. But now on wide open throttle it blows the fuse. I regrounded the system to make sure it wasn`t a ground issue but still blows under WOT. But just driving around town I have zero issuses.

Any help would be appreciated. I just don't have a clue as to why its doing this now. Thanks guys.