Thursday afternoon, 7pm, dusk, and I just closed the hood to my truck after changing the diesel fuel line check valves mounting on engine heads. One had broken allowing veggie to be pumped into the diesel tank (see last post). 
Tomorrow, I was planning a 500 mile trip up to Washington DC to attend the Collective Biodiesel Conference. So, I kinda left it to the last minute..again. I even left it to the last minute of the day, and didn't start the process until almost 3pm. Luckily, since I had done this once before, I had a good idea of the process. To access the front drivers side, you must loosen the alternator mount and push it forward. To access the passenger rear, you must remove the turbo manifold. You should do the front one first to get your wrenches and method figured out as you really don't have much visibility or room at the rear. Interestingly, I had more trouble getting the front assembly re-assembled as the aluminum fuel line seemed to pull me out of alignment to the threads. Probably messed around for an extra half hour getting that to work out right. The only pearls of wisdom I can offer for changing the rear check valves is that this time I laid a foam sleeping pad over the engine. This provided some comfort while laying on the engine and reaching the rear fuel line. This one didn't give me any problems. Inspecting the original check valves (brass ones from McMaster) I found that the rear had failed and the clip ring holding the assembly together had actually broken. The new ones that I have are stainless and will have a higher strength. Though I think I will be incorporating a pressure relief valve into the system soon.
