Since atmospheric pressure at sea level is around 14.7 psi, this will be added to any pressure reading made in air at sea level. Pounds per square inch absolute (psia) is used to make it clear that the pressure is relative to a vacuum rather than the ambient atmospheric pressure. Therefore, 1 atmosphere is approximately 14.696 pounds per square inch. Now converting the psi to standard atmospheres: Therefore, one pound per square inch is approximately 6894.757 Pa. It is the pressure resulting from a force of one pound-force applied to an area of one square inch: The pound per square inch or, more accurately, pound-force per square inch (abbreviations: psi, lbf/in 2, lb f/in 2,lbf/sq in, lb f/sq in) is a unit of pressure or of stress based on avoirdupois units.
I am gonna quote some wiki info from to show how PSIA is caluclated You can figure out this number by doing some basic math seen below. We need to remember that at sea level there is about 14.7 psi of pressure in the air you breath. The princples work the same on a Cummins 24v vs common rail and powerstroke or duramax.įirst thing we need to look at why altitude plays a role. If the engine starts running fine again, look into getting a new injector pump.This Article covers the effect of being at higher altitude in a Turbo Diesel powered vehicle. To test, once the engine starts to misbehave, pour a bucket of water over the injector pump to cool it down. Symtoms: Runs normal when cold, Misses and Dies once warm. For troubleshooting procedures, Go Here: Confirming Stock Timing & Checking and Reseting Timing Back To Stock Very likely issue if Injector pump was just retimed or replaced. Symtoms: White smoke, Engine Knocking, Low Power.
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Go Here: How to install Fuel Pressure Gaugeįuel Pressure should stay above 20 psi at all times, if it goes down to 15 psi, you know you have a problem, to diagnose the cause. It is highly recommended that you install a fuel pressure gauge to avoid blindly throwing parts at the problem. If the engine takes a couple cranks to start after sitting overnight, check for air in the fuel. Symtoms: Possible Hard Starting, Possible Misfire at idle, Possible White Smoke, Especially when engine is powering out. For more information, Go To: Fuel Shutoff Solenoid (FSS)
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If FSS isn’t adjusted correctly, or is full of grime, it will limit the amount of fuel the injector pump injects and thus limit power. The FSS is an electrical solenoid that lifts a lever on the injector pump. Engine runs normally, just runs out of power quick. Symtoms: Engine Low on power, No Sputtering/misfire/smoke. There are a couple things that compound the issue:īasically, If you are starting the engine on a test stand, it is perfectly normal. Same goes for when asking for much power when the engine is cold. If you start the engine, and immediately floor it, it will get to about 2000 RPM, and then pop, sputter, white smoke, and RPM won't climb.
If the engine doesn’t want to start at all, go here: Engine Not Starting In this article we’ll troubleshoot low power, or the engine just not running right. 94-98 12 Valve Cummins Low Power, Sputtering, White Smoke.
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