Just introducing myself

[Big Al]

About the aux fuel tank, we were told that the previous owner mounted a aux tank ontop of a custom build combination headache rack/tonnuea cover I'm guessing it looked similar to some of the aux tanks I've seen elsewhere on this site.My bro has decided that a short block (no heads) is the direction he is gonna go but we were not aware of the differences between the different years. I'll pass that along.
As for the fuel line, it's my mechanic buddies opinion that the original owner has a fuel leak at the line and wasn't prepared to do a proper repair (replacing the entire line)so he removed the guts from a check valve and used the valve to replace the section of damaged line. My buddy told us that any change to the length or diameter of a diesel fuel line from the injector pump to the injector can negativly impact the performance of a diesel engine. By the way he works on Isuzu diesel engines as well as Lombardini and just about any other diesel engine used in the oilfield. As you know the duramax is from Isuzu so he familiar with it.