Don't have a CRD but we sure could use some in the So-Cal based, KJ WEST club and would love to see them out on the trails!

People here are VERY surprised that Jeep makes/made a diesel Libby (at my biodiesel co-op it mostly old MB's, a few newer VW's, a diesel Toureg :drool:, and our Libby). Let's hope the new batch of 50-state diesels will be coming out in '09 as promised. I've been trying to talk the wife into a CRD Grand Cherokee but she thinks they're too big and we'd have to go throug the same hassle to bring one in.

Been running B99 since it came to Cali and still had an EGR failure at 13.5K. 33K on it now. Did the ORM around 31K so hopefully that will help.

I've read BIO is a big no no on the next gen TDI as the rail pressure is 30,000 PSI The highter pressure results in highter temps causing it to "cook" messing up things good Most people here in Ohio where they were sold didn't know one was available eather

Higher pressure won't increase the temperature. Maybe you are thinking of pressurizing air, but the heat comes from reducing the volume; liquids do not compress.

So if that's the case why are we having trouble with air in the fuel in our CRD's seperating at 23000 psi A partial cure is to add a fuel cooler for us Sorry but I've read this in a automitive trade magazine

That doesn't make any sense. Air in fuel will not separate at high pressure, in fact the opposite happens. Do you have any idea how how hot your fuel would have to get at 23,000 psi to boil out???

And I have not yet understood the rationale for installing a fuel cooler either. Cooling the fuel may help with the poorly designed filter head, but the core issue is air leaks. The real solution is a better fuel head; barring that, a pusher pump and an air bleed like Mercedes.

How does biodiesel fit in with these issues? I've heard some crackpot theories about high percentages of biodiesel in common rail engines, but no facts or data.

And I have not yet understood the rationale for installing a fuel cooler either. Cooling the fuel may help with the poorly designed filter head, but the core issue is air leaks.

UFO

Here's a thread about this over on the tdi club. Read it for yourself then argue with them

http://forums.tdiclub.com/showthread.ph ... 772&page=7

Thanks for that link. As far as I can tell, after reading and adding my $0.02, there is one guy there who makes the claim biodiesel breaks down under pressure, but he's got no evidence and a serious anti-biodiesel bias. The one graph supposedly showing biodiesel oxidizing at high pressure/temperature was done under an oxygen atmoshpere. Since the auto-ignition point of biodiesel is higher than that of diesel fuel, under the same conditions, diesel #2 would actually burn up. Conditions inside a common rail are different in that there is no oxygen present.