Skip the auto shop - Our mechanics make house calls

Q: How can i check a bad fuel pump before replacing one.

asked by on

My van stalled at a stalled at a stoplight and now wont start.It still cranks over but no start.It seems like its about to start and makes alow poping noise like its burping.si i changed the fuel filtr but while changing filter i noticed not much gas was coming out of fuel lines and ther is gas in the tank.still no start .when i turn key the fuel pump seems to turn on for couple seconds as normal but still not starting does this sound like a bad pump or something more serious.the van has been running fine til this happend.

My car has 187567 miles.
My car has an automatic transmission.

A: Hello. The best way to test the fuel pump i...

Hello. The best way to test the fuel pump is to test the fuel pressure. You can do this by hooking up a gauge to the vehicles fuel test port. This is an in-line gauge that will tell you what the pressure is when the vehicle is running or attempted to be starting. If the pressure is below manufacturer specification then you will need to replace the fuel pump. Always replace the fuel filter when replacing the fuel pump. This will ensure that the fuel system can flow as designed. The fuel pump relay is part of that system that will pop and fail immediately like you have described. You can test it, or replace it with a known good one to test it. Another quick test you can perform is to spray some starter fluid into the air ducts and see if the vehicle performs any differently. If the vehicle starts or attempts to start better than before, then you have a fuel delivery issue. Keep in mind this could be related to the fuel injectors as well. Test the fuel pressure and go from there.

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: Car cuts off while driving.all power is off when this happens. Wont crank or do anything until time has passed

Hi there: If your Impala is shutting off under different conditions as it appears in your question; the issue is most likely going to be fuel restriction or ignition system component failure. The ignition relay could be faulty as one...

Q: Car outlets not working.

If none of your car's power outlets are working, the first thing I would check would be the fuses. A blown fuse is the most common reason as to why interior electronics fail, so a simple replacement of an inexpensive...

Q: rough idle dies at 65 hesatation

Hello. Thanks for writing in about your 2002 Chevrolet Silverado. This can be caused by a number of things. Most of the time this will cause a Check Engine Light to come on if there is a powertrain issue. If...

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...
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...
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...