Fuel Quality and Diesel Injector Deposits

Paper #:
  • 2012-01-1693

Published:
  • 2012-09-10
DOI:
  • 10.4271/2012-01-1693
Citation:
Lacey, P., Gail, S., Kientz, J., Benoist, G. et al., "Fuel Quality and Diesel Injector Deposits," SAE Int. J. Fuels Lubr. 5(3):1187-1198, 2012, doi:10.4271/2012-01-1693.
Pages:
12
Abstract:
Internal deposits formed within the fuel injection system have been widely reported in the literature. Several root causes exist, with many deposits consisting of more than one material. The final chemistry depends on the availability of trace fuel contaminants and additives and to a lesser extent hydrocarbon/FAME stability and operating conditions. The present paper identifies the primary deposit morphologies, along with the typical root cause. Metal carboxylate salts, also known as metal soaps are most widely reported and are easily recreated under controlled conditions using compounds present at trace concentrations in some market fuels. The salting reaction may occur at low temperatures in the fuel supply system. It is proposed that the resulting fuel insoluble salt molecules are transported as reverse micelles, occasionally plugging filters but more commonly passing to the high pressure injection system. The micelles collapse at regions of high temperatures, pressures and shear within the injection system to form unstable polar molecules that absorb to nearby metal surfaces as deposits. Nitrogen containing amide deposits have also been widely reported and were recreated through reaction of low molecular weight components present in some PIB based deposit control additives (DCA). Finally, deposits caused by degradation of the hydrocarbon or FAME base fuel are occasionally reported in some markets. Such deposits were recreated and are strongly sensitive to the combined effects of fuel stability and temperature. The composition of deposits caused by FAME stability are chemically similar to that of post-test residue removed from Rancimat tests.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$27.00
Mail
$27.00
Members save up to 40% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Training / Education
2009-01-22
Article
2016-09-06
Training / Education
2017-10-03
Training / Education
2011-04-12
Technical Paper / Journal Article
2010-09-28
Technical Paper / Journal Article
2010-10-25
Training / Education
2010-07-07