Starting fluid - wikipedia Starting fluid Diethyl ether, with a small amount of oil, a trace amount of a stabilizer and a hydrocarbon propellant, has historically been used to help start internal combustion engines because of its low 160 ° C ( 320 ° F ) autoignition temperature. Some current products sold as starting fluid are mostly volatile hydrocarbons such as heptane, ( the main component of natural gasoline ) with only a small portion of diethyl ether, and carbon dioxide ( as a propellant ). It is often useful when starting direct injected diesel engines or lean burn spark engines running on alcohol fuel. Some formulations include butane or propane as both propellant and starting fuel. Diethyl ether should not be confused with petroleum ether ( a crude oil distillate consisting mostly of pentane and other alkanes ) which has also been used for starting engines. Contents 1 Usage 1.1 Four stroke engines 1.2 Two stroke engines 1.3 Abuse 2 References 3 External links Usage Four stroke engines Starting fluid is sprayed into the engine intake near the air filter, or into the carburetor bore or a spark plug hole of an engine to get added fuel to the combustion cylinder quickly. Using starting fluid to get the engine running faster avoids wear to starters and fatigue to one 's arm with pull start engines, especially on rarely used machines. Other uses include cold weather starting, vehicles that run out of fuel and thus require extra time to restore fuel pressure, and sometimes with flooded engines. Mechanics sometimes use it to diagnose starting problems by determining whether the spark and ignition system of the vehicle is functioning ; if the spark is adequate but the fuel delivery system is not, the engine will run until the starting fluid vapors are consumed. It is used more often with carbureted engines than with fuel injection systems. Caution is required when using starting fluid with diesel engines that have preheat systems in the intake or glow - plugs installed, as the starting fluid may pre-ignite, leading to engine damage. Two stroke engines Starting fluid is not recommended for regular use with some two - stroke engines, because it has no lubricating qualities. The lubricating oil for these engines is either mixed with the fuel or injected near the fuel intake of the motor. There is also a risk of igniting the mixture in the crankcase. Engines that require premixed gasoline and have n't been run recently are especially in need of the mixed lubricating oil because oil can dry off internal parts over time. WD - 40 was previously recommended for use on two stroke engines because it has lubricating qualities, however, the formulation with CO as propellant instead of propane no longer has the same effect. Abuse Diethyl ether has a long history as a medical anesthetic ; when starting fluid was mostly ether, a similar effect could be obtained using it. Use at the present time directly as an inhalant includes the effect of the petroleum solvents, which are more toxic as inhalants than diethyl ether. Sometimes referred to as `` passing the shirt, '' the starting fluid is sprayed on a piece of cloth and held up to one 's face for inhalation. This trend has gradually picked up since the turn of the century, as phrases such as `` etherized '' and `` ethervision '' have gained popularity. The effects of inhalation vary, but have been known to include lightheadedness, loss of coordination, paranoia, and sometimes hallucinations. References Jump up ^ Popular Mechanics, 1921, p. 781 Jump up ^ `` Ethyl Ether ''. Wolfram Alpha LLC. Retrieved 30 May 2013. Jump up ^ `` CRC JUMP START Starting Fluid '' ( PDF ). Jump up ^ `` NAPA Premium Starting Fluid ''. Jump up ^ Glow plug / starting fluid controversy... http://www.thedieselstop.com/archives/ubbthreads/73IDI/showflat.php-Cat=&Number=518386&page=137&view=collapsed&sb=5&o=&fpart=1.htm. Retrieved 2 January 2014. Missing or empty title = ( help ) Jump up ^ `` How to Start a Diesel Truck ''. WikiHow. Retrieved 2 January 2014. Jump up ^ http://ncadi.samhsa.gov/govpubs/PHD631/ Jump up ^ http://www.medem.com/medlib/article/ZZZ5B6O2B7C External links Product information for different types of ether starting fluid provided by a manufacturer, Spray Products Corp. MSDS for a 50 % ether fluid MSDS for 11 % ether fluid Retrieved from `` https://en.wikipedia.org/w/index.php?title=Starting_fluid&oldid=784768619 '' Categories : Fuels Hidden categories : Pages with citations lacking titles Pages with citations having bare URLs All articles with unsourced statements Articles with unsourced statements from December 2013 Talk Contents About Wikipedia Add links This page was last edited on 9 June 2017, at 23 : 24. About Wikipedia

Question: where do you spray starter fluid in a fuel injected engine
Answer: into the engine intake near the air filter