Becoming a GC kit owner for a 7.3 is like wetting your pants. At the moment when you do it, it kind of feels nice and warm, kinda nice, but after you realize what you have done, not so nice.....
Here are the shortcoming that can be easily overcome.....
1) Check that FPR. The VO IS eating it up. The spring is reacting with the oil and the spring seat IS eroding........
2) The steel factory lines are building poly with every mile.
3) Just a heated filter is not enough heat. It is a very good filter set up, but just not enough heat.
4) On D2, you are starving your injectors of fuel......do a search on the effects of that.....how? Open your fuel filter and see how much fuel is in it....it is only half full. The filter is also under a vacuum, and all those fittings and the cover/gasket that were switched around during the conversion that may potentially leak are allowing air into your fuel column......also not so good.
4) 1/4 IDPEX lines HIH cannot provide enough fuel under vacuum, thus, limiting how much fuel volume that can be delivered to the starving #8 injector.
5) If it is an older kit, the vm100 valves are insufficient for supply needs of the fuel. There was a reason they switched the valves. I helped test said valves for the good boys from GC.
6) The location, or rather re-location of the stock vane pump is obserd. That pump was designed to push fuel not pull. It is about 2-3 feet above and the same length away from where it was intended to be located. You will be using a lot of pumps. At $100-$300/each, a FASS HPFP will soon sound like a good value.
Now, Heres what is GOOD about the system....
1) The tank is really well designed IMHO.
2) The HIH system and fittings is second to none.
3) The Co-Pilot is an awesome addition, very reliable and user friendly.
4) The filter set up is excellent. Located well and uses coolant.
Just an opinion shared by a former GC kit owner and the installer of so many GC kits for VW and 7.3's than I can even remember.......Again my opinion, I could be wrong.
You will also notice when I share an opinion about a product or procedure it is based on first hand experiences. Fact is, there is no perfect system. Just some much better than others. Some over engineered, some under engineered and some with no engineering. My opinion is the GC kit for a 7.3 belongs on an Injector Pumped truck like an old 12V Cummins, or a VW. The kit was directly adapted from the VW and Benz with only the tank size and 2 other parts. One being the machined block for the FPR and the block holding the return fuel valve. For $2500 I felt like I got shorted a kiss and a reach around.......But when I bought it, there wasn't really anything else back then, IIRC it was late 2004.
Why did I take the time to post all of this? FOR YOU BENEFIT. I have already fixed all of the issues that were ignored or overlooked in the kit. Them boys have no business selling that kit IMHO for 7.3's... For VW 1.9 ALH engines, YES......powerstrokes and VW BEW engines, ummmm, NO.