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ryder1954
New User

Dec 1, 2007, 6:33 AM

Post #1 of 5 (3386 views)

fuel pump	Sign In

hi i have a 1996 gmc sonoma 4.3 engine. I would like to know if a 1995 gmc sonoma or a 1995 s10 with the same motor 4.3,
will the feul pump out of one of those trucks fit in my 1996 sonoma,since they are the same motors.pleas help me can also email me
at denis_rochon@xplornet.com

thank you for reading this and hope to hear from you.

DanD
Veteran / Moderator
DanD profile image

Dec 1, 2007, 7:21 AM

Post #2 of 5 (3379 views)

Re: fuel pump	Sign In

I just looked up the specs between a 95 & 96 and they are slightly different. A 95 W code engine (Vortec) wants 55-61 psi, a Z code Engine (TBI Injection) wants 9-13 PSI; the 96 W code wants 60–66 psi,
These Vortec engines are very fussy when it comes to the proper fuel pressure. I’ve seen a fuel pump only a pound or two shy of the minimum pressure rating and the engine not start.
It’s because of the design of popit style injectors they used; it’s the fuel pressure that opens the injector, not an electrical solenoid like on an EFI system. These injectors are more like a diesel’s injectors.
GM has brought out a retrofit multi port injection system to replace the popit design, but the cost of the retro is more in cost then replacing the fuel pump.
I’ve converted a few vehicles when there’s been issues with the popet injectors that were sticking.
Dan.

Canadian "EH"

ryder1954
New User

Dec 4, 2007, 3:11 AM

Post #3 of 5 (3369 views)

Re: fuel pump	Sign In

thank you dan for your reponse.but i was wondering if i use just the motor alone from the 1995 to my 1996 and keep my same unit and reinstall it,would
that work.

DanD
Veteran / Moderator
DanD profile image

Dec 4, 2007, 4:46 AM

Post #4 of 5 (3367 views)

Re: fuel pump	Sign In

The motor “pump” is what produces the pressure they are one in the same. Hanging the wrong motor on the proper sending unit; you’ll still have the wrong motor/pump.
I don’t think you’ll have much luck trying to separate the electrical motor from the mechanical pump, they are stamped together during assembly.
Here’s a picture of the pump and what you’ll find after taking the fuel pump/sending unit apart.
Dan.

Canadian "EH"

ryder1954
New User

Dec 4, 2007, 6:49 AM

Post #5 of 5 (3361 views)

Re: fuel pump	Sign In

thank you so much for your help it really feels good to know that somelse can help out.thank you again
denis rochon from ontario canada

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