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Stalls while driving

Tiny
FRUSTRATED:(
  • MEMBER
  • 2003 GMC YUKON
  • 5.3L
  • V8
  • AUTOMATIC
  • 223,193 MILES
My SUV started stalling while driving it a couple months ago. It had a check engine light that said mass air flow sensor. We replaced it. It did not fix it. It kept popping up different codes so we replaced the crank positioning sensor, fuel cap, ignition switch, fuel pump relay, ECM, replaced ground wires and mass air flow sensor as before mentioned. The fuel pump has been tested twice and the battery has been tested. Nothing is correcting the problem. We have had no engine lights since replacing the ECM. It does restart after it shuts off, but sometimes it will take a few minutes. It will run a little way then shuts off again. When it is driving it runs perfectly. Any thoughts would be appreciated.
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Monday, August 21st, 2017 AT 10:07 AM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
When the engine stalls is the fuel pump working? It sounds like a classic fuel pump problem which these trucks had. I would try the pump and relay first.

Here is a guide to give you an idea on what you are in for when doing the job:

https://www.2carpros.com/articles/how-to-replace-an-electric-fuel-pump

Replace the relay as well.

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Here is the pump from Amazon, this one comes with the harness end which has troubles as well:

https://www.amazon.com/gp/product/B00171V2GC/ref=as_li_qf_sp_asin_il_tl?ie=UTF8&tag=2carprcom-20&camp=1789&creative=9325&linkCode=as2&creativeASIN=B00171V2GC&linkId=d1b4d9b9df9e26006b933f685ac3b1a5

This is what it will be like on your car (below).

Please let us know what happens.

Cheers, Ken
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Tuesday, August 22nd, 2017 AT 11:40 AM
Tiny
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We have replaced the relay but not fuel pump. We had it tested twice but after driving it the last two days (usually my better half limps it to work) I am thinking fuel pump. It stalls in hills and after curves frequently along with other places as well. We gamble on how far we will get once we leave home. ;)
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Tuesday, August 22nd, 2017 AT 12:12 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
I would do the pump, wait until the gas is low.
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Tuesday, August 22nd, 2017 AT 10:49 PM
Tiny
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Thanks for your help. It is greatly appreciated.
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Wednesday, August 23rd, 2017 AT 9:34 AM

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