What should the fuel rail pressure be on a Duramax?

Because the 500 to 3,000 psi of control oil pressure is multiplied by seven, the fuel injection spray pressure runs from 3,500 to 21,000 psi. The Duramax diesel fuel system needs the same super pressures that all diesels need in order to properly inject the fuel.

Note that the fuel rail pressure is at 24,053 psi. As stated previously, the fuel pressure with the Ignition relay unplugged needs to be a minimum of 2500 to 3500 psi during cranking for the return rate test results to be valid.

Subsequently, question is, what causes high fuel rail pressure? A faulty fuel pump or a clogged fuel filter will result in lower than normal fuel pressure at the rail. High fuel pressure results in a rich air fuel ratio, because the increase in pressure forces more fuel through the injectors than required. A rich air fuel ratio causes black exhaust and high emissions (HC’s).

what causes low fuel rail pressure?

Typical causes for low fuel pressure include a dirty fuel filter, weak pump, incorrect tank venting, restricted fuel lines, a clogged pump inlet strainer and faulty electrical control.

What is the fuel pressure on a 6.6 Duramax?

Because the 500 to 3,000 psi of control oil pressure is multiplied by seven, the fuel injection spray pressure runs from 3,500 to 21,000 psi. The Duramax diesel fuel system needs the same super pressures that all diesels need in order to properly inject the fuel.

What is injector balance rates?

Balance rates are measurements that the engine control module uses to keep the injectors firing smoothly, making a more efficient and quiet running engine. Injector balance rates are only measured while the truck is in neutral, or in drive with the foot on the brake.

How does Duramax fuel system work?

A diesel engine’s power output is regulated by the fuel quantity, not the air quantity. The Duramax uses a common-rail system, where high fuel pressure is always available to an electronically controlled fuel injector and it is the injector itself that controls the fuel that is delivered to the combustion chamber.

Are LBZ and LMM injectors the same?

No they are not lbz are 6 hole nozzels and lmm are 7 you can use them in each motor I think but you will want to let your tuner know so he can make changes to yohr tune or it wont run right.

What is a cp3 pump Duramax?

The Fleece Performance CP3K is a modified Duramax LBZ CP3 designed to eliminate the factory fuel flow restriction that begins at 3,000 RPM. If you have a stock CP3 pump you are losing fuel flow and rail pressure after 3000 RPM, which correlates to lost horsepower when you need it most.

Can you drive with a bad fuel rail pressure sensor?

Engine stalling might occur as the fuel rail pressure sensor goes from bad to worse. You will be driving and then suddenly, your engine will stall. It may also stall while idling. This will make driving extremely difficult (and dangerous) and it should motivate you to do something about it.

What are the symptoms of a bad fuel rail pressure sensor?

Common Symptoms of a Failed Fuel Pressure Sensor Diminishing power. Have you noticed a decrease in acceleration power when trying to drive faster? Engine warning light. Is the warning engine shining on the dash? Hard starting. Consuming too much fuel. Stalling.

How do you release fuel pressure from a fuel rail?

You don’t need to disconnect the fuel rail to pull the motor, just unbolt it from the manifold and set it to the side. You can bleed it by slowly releasing pressure via the Schrader valve under the green cap on the fuel line. Wrap a rag around it as you will get fuel spray until the pressure is released.

What happens when fuel pressure is too high?

Fuel pressure that is too high can cause the engine to run too rich. Common causes of high fuel pressure include a bad fuel regulator or a clogged return line. The fuel return line is blocked if the fuel pressure now meets specifications. Otherwise, the regulator may be faulty.

What are the symptoms of low fuel pressure?

Signs of Low Fuel Pressure Unresponsive Throttle. All cars require proper fuel delivery to their cylinders in order for them to run properly. Difficulty Starting the Car. Stalling Engine. Engine Tuning. Check Engine Light Comes to Life. Black Smoke from Exhaust. Turbo Lag. Spark Plugs / Misfires.