Fuel injection not working properly

1988 CHEVROLET TRUCK
157,000 MILES • 5.7L • V8 • 2WD • AUTOMATIC
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MAGIC138194
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  • 1 POST
My fuel injectors spray even without the wires hooked up and the passenger side sprays a lot more than driver's side. Brand new injectors and gasket kit. This is on the truck listed above k1500 pickup with a 5.7 liter 350 with throttle body.
Mar 14, 2022 at 9:09 AM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 POSTS
Hi,

If you are getting fuel with the injector disconnected, it sounds like you have the fuel supply reversed. As far as the injector, the ECM actuates the injector solenoid, the normally closed ball valve is lifted off its seat and pressurized fuel is injected in a conical spray pattern at the TBI. If it's disconnected, that can't be happening.

So, there is a fuel supply to the TBI and a fuel return. Confirm they aren't reversed. I attached a pic below showing what I'm referring to.

Let me know what you find.

Joe

See pic below.
Image (Click to enlarge)
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Mar 14, 2022 at 1:29 PM
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