Q: Need to cycle fuel pump on and off two or three times before starting. Fuel pump or pressure regulator?

asked by on

Suddenly hard to start. When not driven for 24 hours starter keeps chugging until I switch off ignition and try again, then it starts. Or, if I turn key on five secs, turn off and repeat, so I cycle fuel pump, before starting, it starts right away. Is this fuel pump or fuel pressure regulator? (Battery is fine, 12.6 volt unloaded 12.2 loaded. I guess at 30k miles spark plugs are fine.)

My car has 30000 miles.
My car has an automatic transmission.

Hi Peter. Thanks for contacting us tonight. What you are describing is common with a faulty fuel pump relay or pressure regulator - as opposed to the fuel pump itself. If you’re able to ’cycle the pump’ that typically indicates that the relay is not supplying power to the pump consistently - or the pressure regulator is starting to show signs of wearing out. It is also possible that the fuel filter is clogged with debris. I would start by checking the fuel pump relay to ensure it’s not loose, corroded with debris or damaged, followed by the fuel regulator and finally, double check the fuel pump ground wire connection - as this can also be a source of this problem.

Was this answer helpful?
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. Need to cycle fuel pump on and off two or three times before starting. Fuel pump or pressure regulator?

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: What makes the check engine light come on?

The drive complaint you described seems to be an engine misfire, which can be verified by scanning the cars computer for an error code. If you get a code P0300, P0302, P0304 or P0306 then Jeep has issued a Technical...

Q: Slight jerking when driving and sputtering going up hills.

This may be a sign of a dirty or failing mass air flow sensor. The mass air flow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected...

Q: When I go to use fix-a-flat I can hear my tire deflating more

First of all, fix-a-flat is to be used as a backup to using a good spare tire. If you add the fix-a-flat to a leaking tire, you should follow the directions on the can to add the liquid to the...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.