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.
Friday, April 14th, 2023 AT 5:15 PM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 50,584 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
  • 50,584 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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