VIEWS: 30 PAGES: 2 POSTED ON: 7/6/2010
By Jim Newkirk www.idenfifix.com Mffi $wX €m Fry*hkmx €w*s diesel blends available to the con- process known as "transesterlllca- ith the focus on envlron- sumer are $enerallY rated from 82 tion" is performed. In transesteri- mental resPonsibilitY and to 820 bio diesel. The number fi cati on,the bi omassi s reacted people watching their indicates the percentage of bio fuel w i th al cohol s (usual l Ymethan ol consumersnationwide budgets, but other al cohol scoul d be us ed h a ve b ec om em uc hm o re i n te re s t-th a ti s b l e n d e d wi thstandard diesel fuel' So as an example' a as well) and a catalYst.This Pro' ed in bio fuels. Most of us are very B10 bio diesel fuel is a 10 Percent duces a bio diesel fuel (chemically familiar with the 10 Percent bio to diesel blend while a 820 bio a fatty acid methYl ester) similar ethanol blends as well as the E85 diesel fuel is a 20 Percent bio to to standard diesel fuel and glYc- fuels in use around the counffY' diesel blend' erin (the bad stuff we don't want Consumers may be tempted to use out the g lyc- so what exactly is the "bio" part i n the fuel ).S eparate cheaper grades and different of bio diesel? Bio diesel is made erin and you have a clean bio blends of fuel to save some cash. from renewable feedstock sources diesel fuel. As te ch nic ians . v e a l l e x Pe rt- we' such as plant matter (examples: As technicians, You will enced vehicles with "bad gas" and soybean oil, canola oil' palm oil) encounter diesel vehicles that the resultant driveability prob- have had a bio diesel fuel sYstem lems. We'll start seeing retrofit kit installed wirh separare more lssuesas con- sumers start to fill non "For diesel'Powercdvehicles, fuel tanks and valves allowin$ use of either bio or regular diesel fuel flex fuel vehicles with Ihe problemoJ incorred Jvel at the fliP of a switch. You will E85 to save a few dollars useis hecoming even more al so encounter customersw ho For diesel-Powered si mpl y pour bi o di eseldi rectlY vehicles,the Problem of prevdlenlas PeoPIe look uI into the vehicle fuel tank. Now, as incorrect fuel use is becomin$ even more using bio diesel sources luel 1o long as rhe customers in question are using ProPerlY PrePared and prevalent as PeoPle look Iheir diesel vehicles." blended bio diesel, there should at using bio diesel or animal fats (examPles: tallow be no Problems ... right? Wrong' sources to fuel their diesel vehi- recycled cookin$ oils' fryer grease)' Let's look at why. Most automo- cles.While use of commerciallY In either case,the biomass used to tive manufacturers recommend prepared bio diesel fuels is a good oroduce the luel must be ProPerlY bio diesel blends of 5 Percent or thing, use of imProPerlY PrePared processed.ChemicallY, biomass less (B5 bio diesel) and the bio or blended bio diesel can cause fuels are made uP of tri$lYcerides fuel used to create this blend must d ri veabilit yis s uesju s t a s o n th e . of fatty acids (that's the stuff that adhere to the American SocietY g a so l ine v ehic lesm e n ri o n e d clogs your arteries when You eat for Testing and Materials (ASTM) above. too much Pizzar.l and this is not D-675l standard of fuel qualitY' Let'stake a look at bio diesel' s o me th i n gw e w ant runnl ng There is some risk associated with fu e l s and s om e of t h e i s s u e sth a t through a diesel injection system' runnin$ a diesel engine on bio te ch nic ians ar e enc o u n te ri n g When Processin$the biomass diesel fuels that exceed the manu- when these fuels are used imProP' to ma k e b io fuel . a chemi cal facturer's sPecifiedfuel blend er1y. The common commercial bio | www.Aulolnc'org November2009 l4 Auroluc. requirements and the risk of run- filtered through a strainer may Jim Newkirk is the sound like a great way to save Idenffix European ning a vehicle on imProPerlY team leader. is ASE He processedbio diesel fuel is greater money, but in the long run masterwith Ll and still. improperly preParedbio diesel BoschBSCcertified. For examPle, Volkswa$en rec- c a n c o s t a customer i n damaged omme nds bio dies el m i x tu re s o f equipment and repairs. EE no greater than 5 Percent be used where technicians This information is provided by tDENTtFtX@diagnostic repair services Direct-Hit - in their vehicles.While a diesel find fixes faster- is a single ontine source of proven, quick fixes plus a quick "commonsense" will run on uP to 100 Percent bio approach to driveabilityinformation.IJse it eaily, use it often - and Direct-Hit'seasylo-navigate The Repair Hotline: Talk to a specialist!ou staff of 45 AsE-certified d i e se l.pr oblem s c an o c c u r d u e to approach "n"rr"" "u""""s! mastet technicians are divided into five carline teams to answet calls onlv on their carline specialty. i mp ro per f uel blendin g a n d Pre P a - since 1gg7, we have answered more than 3 million catlsfor diagnosticrepair assistance. 7 a.m.-7 p.m ration and concenffation of bio CentratTime,M-F.DiscounttoAutomotiveserviceAssociation(ASA)members' (800) 288-6210' www. identifix.com d i e se l.T he A S T M D- 6 7 5 1s ta n d a rd ,DENTJF.X A 2009, 1DENTIFIX' Ail Rights Reserved p ro vi desf or m ax im u m P e rm i s s i b l e levels of free glycerin contained in the bio diesel fuel. If excess free glycerins are present, deposit for- mation in the vehicle fuel system &s3 l Y*u is likely to occur with detrimental results. The situation becomes even more grim if an unProcessedbio diesel fuel (such as vegetable oils or fry $rease)or mixtures of processed bio diesel fuels (such as those distilled in a non- co mm er c ial pr oc es s )i n e x c e s so f the manufacturer's mixture recom- mendation is used. The eventual accumulation of fatty deposits can cause fuel system failures ranging from misfire issues to clogged fil' ters, pumps and injectors. In worst- case scenarios, actual failure of components is possible. In 100 percent blends of bio diesel that meet the ASTM D-6751 standard for fuel qualitY, the bio diesel fuelwill fall below the requirements of free $lYcerin and total glycerin content (0.020 free glycerin or O.24O total glYcerin expressed as a Percentage of total fuel mass). Excess $lycerin content can cause deposit formation. lead- ing to fuel system clogging and also can contribute to Poor cold weather runnin$ and startabilitY issues. The key point to remember is that a proPerlY PrePared and blended bio diesel fuel meetin$ the ASTM D-6751 standard and used in the manufacturer's called'for blend percentagesshould not cause any issues. On the other hand, running Your car on frYer oil 15 Autolt'tc. I November2009 www.Aulolnt.org
"Bad Bio Diesel Fuel Can Cause Problems"