Skip the auto shop - Our mechanics make house calls

Q: How do I know if my car needs a fuel pump?

asked by on

It's won't crank right up tales a couple of times to crank and when it gets to 30 mph it hesitates to go faster
My car has an automatic transmission.

Hello. Typically a fuel pump can fail in a number of ways. Most of the time they simply go bad and the vehicle will no longer run. In other cases the pump can fail and not hold fuel pressure in the system which can make the vehicle hard to start. This is what it sounds like it going on with your vehicle. To diagnose this I install a fuel pressure tester and check to see if the system holds pressure when it is turned off. If not then you either have a bad pump, injector or fuel pressure regulator. If it holds pressure then the issue is in another system. If you want to have this starting issue looked at, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the vehicle takes a long time to start] https://www.yourmechanic.com/services/car-is-hard-to-start-inspection

Was this answer helpful?

Hi there. The sure way to determine if the fuel pump is failing is to perform a fuel pressure test, both active and residual. The residual pressure test determines if this is the cause of extended cold start cranking. A faulty battery or starter could be causing the multiple cold crank attempts that fail. A proper test on the battery and starting system will reveal if there are any faults to cause this. There are several things that could cause the vehicle to hesitate as you’ve described: low fuel pressure, vacuum leaks, throttle body concerns, map sensor failing, airflow meter failing, etc.. I strongly suggest having a qualified technician perform inspections for the hesitation and hard starting to avoid replacing unnecessary parts. Your Mechanic has several available technicians that can assist you with a car is hard to start inspection and a car is hesitating inspection.

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
  1. Home
  2. Questions
  3. How do I know if my car needs a fuel pump?

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: I insert the key and dash board comes on go to start the van and nothing I can hear the fuel pump kick on.

Hi there. If you turn the key and the starter does not engage, but all other systems activate, then your problem is likely a starter relay that is damaged or the starter itself is broken. It is also possible that...

Q: What is causing my warning lights to come on?

Your battery and charging system will need to be tested to see if the alternator is charging correctly. The alternator is most likely the cause of your Charge Light and Battery Light coming on. You should replace the alternator after...

Q: Broken intake gasket

Intake gasket replacement is an involved job, but it's not such a huge task that it's worth junking the car over. It calls for 4.6 hours of labor. If the car is otherwise in good shape, I would suggest having...

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...
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...