Skip the auto shop - Our mechanics make house calls

Q: Fuel pressure issues, hesitaion and occasionally wouldn't start

asked by on

If I drive my car for a while, especially if the weather is hot, it sporadically gets fuel pressure issues. It starts to hesitate and stumble. If I let it sit for an hour or so, then it runs fine again. The dash shows no check engine light on. I found that the pressure is fluctuating when the issue happens and when it fails and I turn the key, there would be no pressure at all. I had CPS, CAS and EGI main relay replaced, along with the fuel pump. The other day when it was a bit warmer, I drove it and it ran great, but after about half an hour of sitting, it couldn't be started. What could be the issue here? Thank you.

A: An erratic fuel pump may be one of a few di...

An erratic fuel pump may be one of a few different problems. You need to check to see if the fuel pump is getting power when the problem is happening. If it is, then the ground in the right rear wheel well needs to be checked. If both are okay, then you have a bad pump.

You said you replaced the pump before, but the pump may be bad again. When you have the pump changed, the fuel tank should be checked for small metal particles in the bottom. These particles will overheat a pump and stop it, and the car will not start again until it cools down and passes the particles until it gets warm again. Make sure the tank is cleaned out very well and I also recommend changing the filter again.

If you need to have this done, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose your car’s hesitation issue and perform any repairs that are necessary.

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: Would it give me trouble in the future?

Hello. If the car is missing the timing chain, then it will not run. I would steer far far away from buying a vehicle that needs this kind of repair. YourMechanic is capable of replacing your timing chain. However, what...

Q: Car idles rough, hesitate from a stop, shuts off going uphill

Hello there, this is a common fault on the Chevy K2500. There are many different possible causes for the engine to idle rough and have poor gas milage. The most common are the spark plugs, plug wires, cap & rotor,...

Q: Not Starting

This may be a sign of a faulty fuel pump or fuel pressure regulator. As you know, when you turn the key to on, the fuel pump is activated and the fuel system is primed with fuel at a specific...

Related articles

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...