Q: Low fuel pressure at the fuel rail (30psi) then drops to 10psi occasionally while idling. The fuel sending unit was just replaced. 2004 Dodge Dakota

asked by on

Just replaced the fuel sending unit, but still have low fuel pressure (30psi) and flictuations (down to 10psi). The truck runs decently, but has low power and bad mpg. It also has trouble starting when trying 15min to 2hrs after turning it off. I've already replaced 02 sensors, cam pos sensor, crank pos sensor, throttle pos sensor and map sensor. Any ideas? I'm out of guesses. Thank you Dennis

My car has 160000 miles.
My car has an automatic transmission.

Hi there - yes, you clearly have a fuel supply issue, mainly focused on getting enough pressure in the fuel rail to the injectors. Check problem codes first, even if the Check Engine light is not illuminated. I suspect your problem is related to either the fuel pressure regulator, or the fuel pump check valve. either of these could cause low fuel pressure. A clogged fuel filter or weak fuel pump could also be the source here. I recommend a loss of power inspection performed by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, and give you an accurate assessment of damage and cost estimate for repairs.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. Low fuel pressure at the fuel rail (30psi) then drops to 10psi occasionally while idling. The fuel sending unit was just replaced. 2004 Dodge Dakota

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: P0175 p0101

Check the fuel injectors and see if they are leaking and not atomizing properly. The injectors could be working fine but dripping instead of spraying. I recommend performing a injection cleaning on the engine to see if the injectors will...

Q: Mechanic tore up the rubber inside my door, what should I do?

Sounds like you are talking about the weather seal. I would confront the mechanic and ask him to replace it. Yes it is important because it keeps water out of your car when it rains. If you need to get...

Q: Q: What is going on with my car?

Hi there. Check the fuel injectors and see if they are working or not. If the fuel injectors are not working, then you would need to replace the fuel injectors. If the fuel injectors are fine and the engine operates...

Related articles

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.