Stalling/starting issues, where is the fuel pump relay located?

JBONEILLO

MEMBER
2006 NISSAN SENTRA
230,000 MILES

I can’t find the location of the fuel pump relay switch. I’ve checked behind the kick panel, two fuse boxes and lower drivers' side by brake pedal, etc.

Also, my car wouldn’t start a few weeks ago. It cranked but didn’t start. I attached a video to hear the sound. I tried several attempts over about 30 minutes. I waited a hour and it started right up. I had no more issues for several weeks until recently and now the car stalled once last week and once this week when going about 5MPH and once at a traffic light. Any ideas on what the problem could be?

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3 Replies

KEN L

MASTER CERTIFIED MECHANIC
48,363 POSTS

Thanks for the video, the engine cranks and sounds good, I believe you have a fuel pump that is going out or a crankshaft angle sensor, when the engine is cranking without starter can you try starting fluid so we can tell if the problem is spark or fuel related. Here is a guide to help can the fuel pressure which you can rent a gauge from the auto parts store:

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Fuel pressure at idling kPa (kg/sq.cm, psi) .................... Approximately 350 (3.57, 51)

Here is how to check for spark if it doesn't run on starting fluid:

https://youtu.be/baq_aEWNQ0Y

Here is the crankshaft position sensor which is what I would change if you have no spark.

This guide may help as well:

https://www.2carpros.com/articles/car-not-running-advanced

Check out the images (below). Please let us know what happens.

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Monday, August 14th, 2023 AT 5:14 PM

JBONEILLO

MEMBER
2 POSTS

Thank you for your response. I am going to check on your recommendations. I also wanted to let you know I replaced the crankshaft sensor about 20,000 miles ago then had to replace it about 5,000 miles after that. Maybe that could be a sign of something? No codes came on and no engine light on. Another new symptom today that happened and didn’t happen before is the car turned off or stalled while driving 45 MPH. Don’t know if this new information could change your diagnosis? Thank you again!

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Wednesday, August 16th, 2023 AT 2:53 PM

KEN L