Skip the auto shop - Our mechanics make house calls

Q: Fuel Pump Pressure intermittent 2001 Chevy Silverado 1500

asked by on

Upon turning key to on, sometimes I have no fuel pressure. New fuel pump, new filter, new fuel pump relay. Cycling the key switch will solve problem. No problems after initial start.

My car has 145000 miles.
My car has an automatic transmission.

Hi there - you have a failed or leaking fuel system check valve. This valve is designed to maintain low, positive pressure in the fuel system. This allows faster starts first thing in the morning, requiring the fuel pump to run less building up adequate pressure to fire the injectors. Since it leaks down, the fuel pump has to work longer to build pressure. This check valve may be part of the fuel pump assembly, or the fuel pressure regulator assembly. I would recommend an inspection of the fuel system by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, 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 1000 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!

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: Key won't program

Greetings! Your truck is considerably new, therefore the key, ignition, and the immobilizer system will have to be reprogrammed by the special equipment that is only available at the dealership, or by a licensed locksmith.

Q: Emergency brake light on

The red brake light is primarily lit when you apply the emergency brake, but it also lights up when you have a hydraulic problem with the brakes. Things like low fluid levels, leaking wheel cylinders, or brake hoses can also...

Q: I think the motor is having a starting issue. New battery, separate solenoid, and put in a new starter. Are all the cables good?

Hey there. The starting system has to turn the engine over at a certain minimum rate (RPM) in order for the engine to catch and run. If there is no voltage drop between a new fully charged battery and the...

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.