Nicely done!
There's a few of those greaseburners which come through our shop but they are generally homebrewed setups. The Greasecar setup looks well engineered. The thing to be careful of (and I have seen this happen a couple of times): if the restaraunt is not real careful about keeping the grease clean you could have a major problem. Some restaraunt employees have been known to dump mop buckets etc into the grease trap, some of the floor cleaners are very caustic and will destroy the inside of rubber parts in a hurry. This can lead to some painfully pricey repairs. I believe a couple of companies make test kits for that, you might want to look into it.
FWIW, we see a fair number of these which run on straight dino diesel wind up with fuel leaks in the injection pump area, it's always the various O rings have deterioated. Some have had the problem two or three times. We think it's something to do with the low sulfur formulations.
