Q: Gmc yukon has intermittent long cranks and has a rough idle. Tested fuel pressure at rail. 55psi.

asked by on

When I start it the fuel pressure is over 100 psi. Has a rough idle.

My car has 1400000 miles.
My car has an automatic transmission.

Hello. A fuel pressure that is over 100 psi is extreme unless you vehicle has been modified to run that way. When this is the main focus of the problem you are likely having an issue with the fuel pressure regulator. The vehicle will usually have other signs of running rich when this is the case. You can check the condition of your spark plugs, and check for excess grey or black smoke. Both are signs that there is too much fuel in the system. It is a rather straight forward repair if you are comfortable with working with fuel lines and depressurizing the system. For more help resolving the issue, contact our service department to schedule an appointment.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Gmc yukon has intermittent long cranks and has a rough idle. Tested fuel pressure at rail. 55psi.

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Why doesn't car start after running out of gas girlfriend ran gas out of car now won't start plenty of gas in tank doesn't sound l

Fuel pumps rely on liquid gasoline for cooling. Consequently, it is recommended to keep the fuel tank at least 1/4 full to prevent the fuel pump from overheating. If the pump is run to the point of being dry, the...

Q: What mileage should rotors be replaced on an F250 that doesn't tow?

There is no set mileage that the rotors should last. You may need to replace them if they get warped or you let the brake pads wear down till the metal pad backing grinds in to the rotor. Your rotors...

Q: Heat not working in van even after replacing the fan motor.

Hello there, many common faults will cause your 1997 GMC Savana to have no heat. By the fan it sounds like you are talking about the blower motor, the one inside the vehicle that supplies the airflow from the vents....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...