What does low fuel rail pressure mean in Duramax?
Trouble Code: P0087 Fuel Rail/System Pressure – Too Low This means the fuel pump can vary its speed to deliver fuel as needed, rather than running constantly at a steady speed. There is a sensor on the fuel rail that monitors fuel pressure and determines if the vehicle needs more or less fuel.
What is the proper fuel pressure for a Duramax?
Normal Oil Pressure Readings?
- Disc Man. I recently bought an 08 Duramax with 32,000 miles on it and the oil pressure guage seems to fluxuate more than any other vehicle that I've ever owned. ...
- CAGLE DURAMAX
- Ryan_Dmax. On a cold morning mine will be just over half way. ...
- Hondarider552. ...
- danhr. ...
- Disc Man. ...
- 03Duramax4x4. ...
- poosniffer. ...
- gr8shot. ...
- mackyoudip. ...
How much fuel pressure does a Duramax have?
Their spec indicates a minimum fuel rail pressure of 1450 psi @ cranking speed. Mine actually barely started today with a rail pressure of 1228 psi cranking @ approx 150 RPM. Engine idling rail pressure is 4K to 5K @ temp (180F) with a fuel temp of less than 135F.
What is the normal fuel pressure at the rail?
You will need a scanner tool to measure fuel rail pressure. Mine was about 1500 psi at start up and then 500-600 at idle. Then varies depending on throttle position.
What is normal fuel rail pressure on a LBZ Duramax?
knaffie, That one I do know!! The injection pump (CP3) draws the fuel from the tank through the filter and then ramps it up pressure to the 26-28k psi at the fuel rail to feed the injectors.Apr 24, 2010
What should fuel rail pressure be on Duramax at idle?
For starting a Duramax, you'll need a minimum of 1,500 psi fuel pressure at the rail while cranking and at idle a minimum of 5,000 psi.Jan 29, 2015
What PSI should fuel rail pressure be?
What Psi Should Fuel Rail Pressure Be? It will always take 58psi for the rail to maintain pressure, regardless of the operating condition (less than sufficient fuel to keep the pump running).Feb 20, 2022
How much fuel pressure does a 6.6 Duramax have?
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.Feb 3, 2020
What causes low fuel rail Duramax?
It could be a restriction or a leak on the supply line between the fuel tank and the injection pump. It could be a weak injection pump not able to increase fuel pressure up to the maximum under load. It also could be one or more injectors have high return rate.Sep 12, 2008
What should my fuel rail pressure be lb7?
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.Mar 29, 2017
What should my fuel rail pressure be kPa?
Required fuel pressure can vary depending on your vehicle's engine and fuel system. Carbureted engines may require as little as 28 kPa (4 PSI), while modern multipoint fuel injected high-performance engines can require as much as 414 kPa (60 PSI).Feb 17, 2021
What is the correct fuel pressure?
Fuel pressure for most vehicles should stay in a 5- to 10-psi range.
What happens if fuel rail pressure is too high?
The Importance of Correct Fuel Pressure If fuel pressure is too high, your vehicle's engine could be over fueled, leading to many of the symptoms listed below. Some of these symptoms include your engine running rough, poor fuel economy and black smoke from the exhaust.
What causes low fuel rail pressure?
Three of the most common causes of heavy equipment low fuel pressure are a faulty regulator, a fuel pump malfunction or problems with the fuel lines.
Where is the fuel rail pressure sensor on a Duramax?
The sensor is mounted on the right fuel rail under the EGR Cooler.
How much fuel pressure does a diesel engine have?
On diesel engines, it features a high-pressure (2,000 BAR – 29,000 PSI) fuel rail feeding individual solenoid valves, as opposed to a low-pressure fuel pump feeding unit injectors or pump nozzles. Diesel fuel is injected into the engine in very small amounts by electronically controlled injectors.Dec 8, 2015
What is a leaky fuel filter head?
The filter head is the part that the fuel filter screws into and has the primer plunger incorporated into it.There are O-rings and seals that break down with age and use.
Where is the CP3 pump located?
This is a big job to do as the CP3 is gear driven off of the camshaft and is located in the valley of the engine.
Can low fuel rail pressure cause MIL?
Low rail pressure may or may not cause an MIL (check engine light). This is a very common problem that we hear about from our Duramax customers. Actual fuel rail pressure is not keeping up with desired fuel rail pressure. This may only happen in high fuel demand situations like towing or racing but it can also happen with everyday use.
