When I bought my '85 K10 Suburban in November of 2010,it had a nearly full tank of fuel,which was a mixture of diesel,kerosene and God knows what else someone may have put in it,because it was supposedly set up to run veggie oil or used cooking oil...the Burb has a 40+ gallon tank,and I have never put it on the road yet due to no money,so I have only started it up infrequently to keep the engine free and hopefully keep the batteries from dying--sometimes I have let it sit idle without starting it for a few months in a row............................................................................................................................................................................................................Despite that,it still starts ,though sometimes rather hard,probably due to it needing some glow plugs ,I only had 2 new ones I put on the drivers side,and I dont know if any are dead on the passenger side --it always starts when I get the batteries fully charged up,but its not always eager to fire up below 45 degrees or so....it's taken me till the present day to run the tank down to 1/4 of a tank,I bet I have let it run 10+ hours since I got it ,before I used that 3/4 of a tank..Diesel fuel does not seem to go sour as quickly as gasoline does,it takes years instead on months--we ran our loader on 5 year old diesel we siphoned from a street sweeper and several diesel busses at the junkyard and never had any real issues,we were careful to filter it well before pouring it in the tank though....and didn't siphon it all the way to the bottom of the tanks,to avoid getting any sludge in the fuel..........................................................................................................................................................................................................Algae can grow in it though,and it attracts water too,but so far,despite letting both my Suburban and my plow truck sit long periods of time (and I rarely have more than 5 gallons in the plow truck since buying it in '03),I haven't had any trouble with the trucks really...haven't even replaced the fuel filter on my plow truck once yet,it looked new when I got it,a Wix 33123--now its getting rusty on the outside ,so I guess I should treat it to a filter change soon........................................................................................As long as no valves have got stuck in your engine ,and it spins over freely,I'd say you wont have much trouble getting it started,even on the "old" fuel,though it may take some coaxing to get it fired up at first...once its running you could just let it use up whats left....or maybe if your determined to pump the old diesel out,it could be used in your home oil furnace instead of having to get rid of it otherwise....I was going to use the diesel in my Suburban in my plow truck,but was leery of doing it in case it did have some "unknown" alternative fuel mixed in with it.....but it doesn't seem to bother the Burb any,once its started ...
I'm not sure that I'll be able to get time off, but I'll look into it! Would be neat to meet everyone 
. It's a tight squeeze too, and I don't want to risk damaging the other k5 by trying to dig it out... I know...
for as long as I can 
