Not getting fuel

1988 GMC SIERRA
220,000 MILES • 5.7L • V8 • AUTOMATIC
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SAMMI420
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Help!
Ran fine for 3 weeks. The best it has run since I've had it in fact. It didn't shut off, but when my husband tried to start it back up, no go. For over an hour he tried to get it started, finally started and was able to drive it home. We have been trying to get it running ever since. The fuel pump is good, fuses are all good, changed out the injectors and throttle body, still won't start. But it will start if you pour a little gas in the carburetor or if you spray the carburetor with a spray bottle of gas once you get it started, it will stay running. Have checked the wiring to the fuel pump and wiring harness to injectors. There's no cracks or bad spots in the wiring. can anyone shed some light?
Jul 2, 2022 at 9:37 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,273 POSTS
When you say the fuel pump is good is that because you replaced it? and if so, what brand pump did you use? We should run the codes before we begin to see what comes up. This guide will help:

https://www.2carpros.com/articles/buick-cadillac-chevy-gmc-oldsmobile-pontiac-gm-1983-1995-obd1-code-definitions-and-retrieval-method

Also, we should see if the injectors are getting pulse, this guide can help:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Please run down these guides and report back.
Jul 3, 2022 at 2:13 AM
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SAMMI420
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The injectors are not getting pulse. We are about to go through the guides now.
Jul 6, 2022 at 2:33 AM
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STRAILER
  • ✓Experienced Mechanic
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I would remove the distributor cap and crank the engine over to see if the ignition rotor spins.
Jul 6, 2022 at 10:13 AM
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SAMMI420
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Yes it spins.
Jul 6, 2022 at 11:59 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,273 POSTS
Let's run the codes to see what comes up. Also, you could have a shorted injector, this guide can help us test them:

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

Please run down this guide and report back.

Jul 8, 2022 at 8:35 AM
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