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Will not start

Tiny
BOULDERSKIES
  • MEMBER
  • 1995 GMC SUBURBAN
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES
My SUV will crank. It is getting spark to plugs.A bunch of parts have been replaced including the ignition switch. The tell-tale clue is the fuel pump (just replaced) will run for about six seconds and then quit. Therefore no gas is getting to throttle body carburetor.

Does this sound like the fuel pump or an electrical problem?

Thanks for everything you guys do.

Scott
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Friday, May 24th, 2019 AT 4:57 AM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning,

While the engine runs, the fuel pump cuts off?

https://www.2carpros.com/articles/car-cranks-but-wont-start

Can you verify the engine size? No 5.3 listed for 1995.

It should only run for two seconds with the key on.

Do you have spark?

Does it start right back up when it shuts off?

Roy
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Friday, May 24th, 2019 AT 5:22 AM
Tiny
BOULDERSKIES
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It is a 350. Sorry, I didn't know the exact size in liters. The fuel pump runs for about six seconds with key on, engine not running. Normal? Yes, have spark. Engine doesn't run at all, just cranks.
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Friday, May 24th, 2019 AT 5:58 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Thanks.

That is normal. It should stay running while cranking.

Can you check the fuel pressure?

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

Also, I would check the compression to be sure the timing chain is good.

https://www.2carpros.com/articles/how-to-test-engine-compression

Roy
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Friday, May 24th, 2019 AT 6:15 AM
Tiny
BOULDERSKIES
  • MEMBER
  • 20 POSTS
Thank you for your quick replies. Here's another clue: If I spray starter fluid into the carburetor, the engine fires right up. Does that change your last reply?
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Friday, May 24th, 2019 AT 7:19 AM
Tiny
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  • MECHANIC
  • 52,797 POSTS
If it starts with fluid, it is a fuel delivery issue.

It could be either the fuel pump itself, the ECM which controls the injectors or the injectors themselves.

Roy
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Friday, May 24th, 2019 AT 7:35 AM
Tiny
BOULDERSKIES
  • MEMBER
  • 20 POSTS
Thank you Roy. I'll let you know what we find. Scott
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Friday, May 24th, 2019 AT 7:39 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
You are welcome.

Always glad to help.

Thank you for using 2CarPros.

Roy
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Friday, May 24th, 2019 AT 7:41 AM

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