if you're running pure bio diesel (pure veggie oil - no petro included) then I'd expect problems at 40F - the stuff gets really thick - the guys I know who are running recycle waste cooking oil start 'em on good old diesel - have a warming element in the waste oil tank that heats it up - and switch over after a couple minutes - they also switch BACK to regular diesel a minute or two before shutting off - so the waste oil doesn't gel up in their injectors -
My drill was insert key, turn on glowplugs, pull out starter/enricher knob, when GP light went out - engage starter and start engine. It'd run like absolute crap for the first couple minutes then settle down and do just fine. This was running pure petro-diesel. In the winter having a block heater (anytime it was below, say, 45) was a big help. In fact the heat used to come up through my defroster vents over nigth and keep my windshield clear!
Not sure what, if anything other than running down your battery, the multiple engagements of the glowplugs is doing for you. You can check the resistance of the glowplugs (cannot for the life of me recall what its supposed to be - but I can assure you that neither infiniity nor zero are good). The spec should be in Benteleys OR available elsewhere -
Best of luck
Steve
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