Skip the auto shop - Our mechanics make house calls

Q: Fuel pump not coming on car wont crank replaced tps fuel pump

asked by on

Just replaced,a,fuel pump and a throttle position sensor and a throttle position,sensor connect but fuel pump not - on and car won't crank

My car has 249000 miles.
My car has an automatic transmission.

If the fuel pump is not momentarily running and priming at key on, then the fuel pump circuit has to be traced to find the power interruption. The recommended service to accomplish that is an electrical circuit/component diagnostic. With regard to engine starting, if there is no cranking at all, that is no operation of the starter motor, among the first possibilities is a weak battery, excessive voltage drop in the starter circuit due to poor electrical connections, or a dead starter/solenoid. Prior to performing diagnostics the battery should be load tested. With a battery in good condition and the engine immobilizer (security system) off, if the starter motor does not operate at that point, there are only two possibilities: 1) either there is no power to the starter motor/solenoid, or an excessive voltage drop, hence the entire starter circuit would have to be diagnosed; or 2) there is power but the starter/solenoid itself is bad and that includes intermittent operation which does happen. If you desire that a specialist from YourMechanic determine which of these is the issue, and get it resolved, please request a no start diagnostic. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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: I think my cars transmission is going out

Hello. Grinding noises at high speeds could be related to wheel bearing or transmission issues. This type of problem may be difficult to diagnose without test driving the vehicle to determine whether or not it is worth fixing. A certified...

Q: Clicking sound when turning over.

What you are describing sounds like a faulty starter solenoid. A faulty starter solenoid will generally produce a clicking sound when turning the key. The starter solenoid is located on the starter and has internal electrical contacts that transmit electricity...

Q: my battery keeps going dead with a new alternator and new battery

Hello, thanks for writing in about your Oldsmobile 98. You need to have the charging system checked to see if the alternator is charging the battery. You may have a blown main fuse if the alternator is proven to be...

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...
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...