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Fuel pump interchange

Tiny
RANDOMGUY26
  • MEMBER
  • 1993 CHEVROLET S-10
  • 4.3L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 148,000 MILES
Can I interchange a fuel pump on a 1993 Chevrolet s10 pickup two wheel drive 4.3 tbi with a 1998 or 1999 GMC Sonoma 4.3 vortec fuel pump?
Friday, April 28th, 2017 AT 10:13 PM

6 Replies

Tiny
STEVE W.
  • MECHANIC
  • 12,996 POSTS
No, They are designed to run at different pressures and volumes due to the different injector types. TBI runs at 12-14 psi while the Vortec runs at 60+ psi.
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Saturday, April 29th, 2017 AT 12:41 AM
Tiny
RANDOMGUY26
  • MEMBER
  • 3 POSTS
Okay, my injectors pulsate but no fuel sprays out my pump hums and I am getting spark what could cause that?
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Saturday, April 29th, 2017 AT 1:08 AM
Tiny
STEVE W.
  • MECHANIC
  • 12,996 POSTS
Pump may not be generating enough pressure, fuel filter clogged, pressure regulator failed, bad injector.

I would start with a pressure test and verify you have fuel pressure and flow at the injector.

Spray some starting fluid in and see if it will start on that as well. Easy way to check spark, timing and compression.
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Saturday, April 29th, 2017 AT 3:29 AM
Tiny
RANDOMGUY26
  • MEMBER
  • 3 POSTS
Did all that before I got on here. I have spark I have pressure I rebuilt the TBI put a new cap and rotor on new plugs and wires new vacuum lines to the TBI new three point check valve could it be the ICM?
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Saturday, April 29th, 2017 AT 2:45 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,940 POSTS
If the pump is running then you need to check the pressure.

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

Please run this test and get back to us so we can continue helping you.

Cheers, Ken
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Monday, May 1st, 2017 AT 8:08 PM
Tiny
STEVE W.
  • MECHANIC
  • 12,996 POSTS
Toss a noid light on the injectors and see if they are getting a full voltage signal. If they are actually operating and have pressure they should be spraying fuel.
If you dump some fuel in does the engine fire? The injectors look for a tach signal to start firing so if the wiring or the ICM itself has a problem that could be the reason.
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Tuesday, May 2nd, 2017 AT 12:20 AM

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