Punished

91 S13 with SR20 Redtop with RS Enthalpy tuned ecu. Has been running an in tank Walbro 255 set up for 5+ years with another Walbro 255 inline towards the engine bay. The intank has a pigtail relay with 20amp fuse attached to the system with a main power wire that feeds it. This then is wired in to the stock blue plug for the pump. The first owner wired this in, so I have not traced the power wire to what it has been tapped in to in the engine bay.

With that said, I have never had a problem until 2 months ago. On the highway, lost power and had no fuel. The 20amp fuse had completely burned up and melted to nothing. Replaced the fuse/holder with a 15amp and wired in a new relay pigtail to freshen everything up.

Now today, driving down the road, lost power and knew it was fuel again. Coasted to parking lot, check pigtail relay fuse and it was fine. Check main fuel pump fuse in the engine bay and it is fine. Had it towed home and have been digging through the fuel setup.

I have pulled the fuel pump and know this does work (hooked to battery). I checked continuity and everything is good. The power wire for the relay is good as well. When I plug everything in to the blue plug and check for power at the fuel pump plug for the walbro nothing comes through. Sometimes it would spike when I turn the key to ACC for a split second but then nothing.

I found a post online about removing the EGI Pump relay and jumpering 1 and 3 to see if the pumps turn on. They do not, I also switched two relays and nothing changed.

I then saw another post about using a jumper on 3 and 2. Picture below to show which I jumpered and both inline and intank pumps come on 100% and keep running (stayed on, not just a priming on). The intank plug shows 12v when this jumper is on. (yes the cable is super long)




So, my question here is. What do I need to do now?

New EGI Pump fuse? Do I need to check continuity from the ECU? (i think it is a black with pink or purple stripe wire) I'll check ground wires tomorrow coming off the fuse box. I have not touched wiring on this car in 3 years, so this i random for me to have a wiring problem pop up when nothing has changed.

Thanks