What Is Def Gauge On A School Bus?

What is DEF gauge?

Diesel Exhaust Fluid (DEF) Making sure you do not run out of DEF in a SCR equipped truck is simple – watch the DEF gauge, which is part of the diesel fuel gauge, for when it is time to refill. DEF is stored in a dedicated tank next to the fuel tank on the driver’s side.

What does DEF mean on a school bus?

If your operation’s shop routinely services diesel-equipped school buses and other diesel-powered vehicles, you may be aware of the use of DEF ( diesel exhaust fluid ). DEF dosing is controlled by the engine’s ECU. When heated, DEF splits into ammonia and carbon dioxide, which is then atomized and vaporized.

How do you know when you need DEF fluid?

DEF is consumed at a rate of about 2-3% relative to the amount of fuel you are using. This means between 1.2 and 2.0 gallons of DEF will be required for a vehicle with a 65-gallon gas tank. If you have a five-gallon DEF tank, DEF should be replaced every third or fourth time you fill up.

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How often should I fill my DEF tank?

The typical DEF tank will be approximately 15 – 20 gallons, thus requiring a fill every 5,000 to 6,000 miles.

Can I make my own DEF fluid?

DEF is 32.5 percent high purity urea and 67.5 percent demineralized water. But don’t think you can save some money and make your own DEF. Agricultural grade urea or UAN (urea ammonium nitrate) should never be used in place of DEF.

Can you pee in your DEF tank?

The urea found in urine is not in the proper concentration needed for DEF, nor is it of a sufficient level of purity, in either urea or water. The bottom line, to spell it out just one more time… urine and DEF = Never. DON’T PEE IN YOUR DEF TANK!

Is DEF fluid made from urine?

What is DEF made from? DEF is a mixture of (typically) 2/3 deionized water and 1/3 urea. Technically, urea is derived from one of the byproducts of urine. But it’s synthetically made, so no cats are ever harmed in the production of the fluid.

Is DEF fluid made from pig urine?

Likewise, is diesel exhaust fluid made from pig urine? This fluid is composed of Urea and deionized water. Pig urine (or cow, horse, even human) is largely urea and many people refer to DEF as pig urine even though the majority of DEF on the market is not made using animal byproducts.

What happens if I run out of DEF fluid?

If the truck is allowed to run out of DEF the engine’s power is reduced, a solid red warning will be displayed and the vehicle speed will be limited to 5 mph until the DEF tank is refilled.

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Can you use water instead of DEF fluid?

For the O/O’s using DEF, you can use distilled water instead. Basically DEF is 33% urea and 67% deionized water. So, in an emergency you could use a mixture of 1/3 pee and 2/3 distilled water.

What happens if you accidentally put DEF in diesel tank?

DEF and diesel should never be mixed. Although safeguards have been designed to keep the diesel fuel separate from the DEF, it still happens: DEF is accidently put into the diesel tank or diesel into the DEF tank. When it does, it’s more than just a little problem: It can lead to significant damage and costly repairs.

Where does DEF fluid get injected?

Small quantities of diesel exhaust fluid (DEF) are injected into the exhaust upstream of a catalyst, where it vaporizes and decomposes to form ammonia and carbon dioxide. The ammonia (NH3) is the desired product which in conjunction to the SCR catalyst, converts the NOx to harmless nitrogen (N2) and water (H2O).

How many miles does DEF fluid last?

You should get around 3000 miles per tank DEF. Most DEF tanks require one gallon of DEF for every 50 gallons of diesel fuel, and one gallon will generally last between 300 to 500 miles.

How do you calculate DEF level?

Checking the DEF Levels. The storage tank is usually found either next to the diesel fuel tank on a truck, or near the area of the spare tire on a car. All vehicles with diesel engines meeting 2010 or later EPA guidelines have a dashboard warning system that alerts you when the DEF level is low.

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