so what happened with your kit? and what are you running now?
Well, remnants from the GC kit are in use in my truck now, after an extensive system remodel.
Well, the GC company began with VW's and Benz. They adapted the system onto the PSD. Well, the only thing similar between VW/Benz and PSD is the fact that they all burn diesel. Thats about it.
1) The tanks are designed for HIH. (Good)
2) The filter is under the hood and use coolant to heat. (Good)
3) Pex line is supplied for HIH (OK) buti ts 1/4" (Bad)
4) Then things go south fast. THe factory fuel pump is relocated in the kit (very bad for the D2 side) and just as bad for the Vo system. Bothe fuels share the same pump. Stock fuel pumps do not handle VO very well. The relocation requires the pump to suck fuel (VO and D2) through the filters. It dont work too well. Then, the stock fuel pressure regulator is used (bad) and two valves are added. The valves are good for VW/Benz, but do not allow for enough flow reauired to keep the PSD's thirst requirements.
Performance faults in the GC kit
1) The fuel bowl is only about half full, because the fuel is sucked through it.
2) The VO filter suffers the same problem.
3) THe valves are too small for a 7.3
4) The PEX line in the HIH is too small
5) Only the stock pump is used and it is not up to what is being asked of it
In conclusion, use some components in the GC kit if you want to do a DIY kit. There is a little good in it. Otherwise- stay away from the GC kit for the 7.3. However, if you want a great kit for the 99.5-2003 VW ALH, you cant beat their system IMHO. I have done lots of them and they do a great job with a few modifications.