If the temp drops to around 40 degrees and I'm running b99 how will that present itself with my truck...this a.m. it was running great until i tried to hit passing gear then it flattened out as if the fuel filter was clogged. then back to running normal when i eased off the throttle...? HMMM??
thx
Mike

 

Bio should run the same or better than petro diesel.

 

Pure biodiesel will start having issues when the temps get into the 30's. So you're close. Recommend running less than B5 for the winter months when temps drop to freezing or below.

MikeyB

 

So mikeyB you think that this could be my situation...? Now that is warmed up i cant check it out cause im at the work...

 

I believe 26 degrees C is the gelling point for most pure Biodiesel.......it is not as cold resistant as #2.

 

Depending on the base stock, you could have been gelling at that temp. Have you been keeping up on fuel filter changes?

 

sure have... this filter is less the 2500 miles old....And good call cause thats exactly what it feels like but only when i was trying for passin gear. I'm going top off in the am when i get off wk to give me about a b40 mix...then ill see whats up.
thx
Mike

 

I've ran a good bit of biodiesel (I brew myself) through my cummins and my VW TDI. The cummins engine is much less 'finicky', but if I don't use an anti-gel or have a fairly new fuel filter in when the temps start dropping to 40F or lower, I start feeling hesitation until acceleration or going up hills. If I let off the accel and push it lightly, the hesitation goes away. I've had this happen 3-4 times over the last 2 winters. Enough to change out the fuel filter.
As an aside, since my wife drive the truck 1-2 times a week and works nights occasionally (and is now pregnant), I didn't want her to get stranded or experience this again...I installed an inline fuel heater (www.disnet.com ~$50). And, most recently, a fuel tank heater (stick on pad) from ultraheat.com.

This allows me to run biodiesel blend (B5 - B50) year round with less worry about gelling, filter clogs, etc.

Also see my post in the VW TDI forums regarding other heaters available.

http://forums.tdiclub.com/showthread...82#post2715882