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: 2006 Honda Civic Dx won't accelerate over 20 mph...Checked codes says it's a misfire change plugs and found oil in well...Plz Help

To start you will need to replace the valve cover gasket and clean out all the oil out of the spark plug tubes. Then you will need to replace every coil boot that got oil on them. Once this is...

Q: Car will start and run smoothly but will die when you try to accelerate.

Hi there. There may be a misfire on a cylinder that is causing the engine to hesitate on acceleration. Check all of the spark plugs and wires and see if they have burn marks. If there is burn marks on...

Q: loss of power. 2003 Mazda 6

Hi there, thanks for writing in. You should check to see if the timing belt is off or jumped, or your injectors have some blockage and needs to be cleaned cleaned. Also, make sure you have a clean fuel filter....

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...