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No fuel with spark?

Tiny
DAVID9082
  • MEMBER
  • 1991 CHEVROLET TRUCK
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 167,000 MILES
I have a new distributor and components, new fuel relay; new spark plugs and wires. I’m on TDC I have fuel to TBI but no fuel in bowl I checked injectors, and they have pulse. I disconnected the HEI bypass and got fuel but if I continue it no fuel. Could it be the TBI fuel regulator the wires going to the injectors and the bypass what is up with that I’m thinking two different things.
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Friday, April 14th, 2023 AT 5:15 PM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
The first thing you need to do is check the fuses.

Here is a guide to help:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Check out the images (below). Please let us know what happens.
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Saturday, April 15th, 2023 AT 10:30 AM
Tiny
DAVID9082
  • MEMBER
  • 3 POSTS
I’ve already checked all that.
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Sunday, April 16th, 2023 AT 9:27 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
Okay, I didn't know, please unplug the fuel injectors one at a time to see if the pulse comes back, you may have a shorted injector. Also, let's run the codes to see what comes up.

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

Please go over this guide and report back. Also, can you see if the engine runs on starting fluid?
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Monday, April 17th, 2023 AT 10:09 AM
Tiny
DAVID9082
  • MEMBER
  • 3 POSTS
It’s not the injectors. There are two problems I believe there’s a short in the tan/black wire going to ECM because it doesn’t fire when it’s plug in verse unplugged when unplugged I get spark and fuel but no fuel to the regulator so in that I believe the regulator needs to be changed out. I disconnected the gas line to the TBI, and I get fuel when tan and black are unplugged The tan and black is “hei bypass”.
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Tuesday, April 18th, 2023 AT 1:36 PM

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