1992 GMC Safari Fuel system

Tiny
MOELALON
  • 1992 GMC SAFARI

Engine Mechanical problem
1992 GMC Safari 6 cyl Two Wheel Drive Automatic 130000 miles

Hi,
Engine sputtered for several minutes like a fuel problem was happening

I replaced the fuel pump, fuel filter and assembly, and sending unit, cleaned the tank, tested the pressure (15 psi).

what else could it be?

Do you
have the same problem?
Yes
No
Saturday, July 24th, 2010 AT 2:32 PM

12 Replies

Tiny
RASMATAZ
  • MEMBER

Hi moelalon, Welcome to 2carpros and TY for the donation

Is this a 4.3l engine or 4.3l with a turbo? Also is it a TBI or CPI injection system?

TBI pressure should be: 9-13psi

CPI spider assy should be 54-64psi-Please confirm-NOTE: CPI injection its way too low-could be the pressure regulator, fuel pump check valve leaking or a weak pump

Was this
answer
helpful?
Yes
No
Saturday, July 24th, 2010 AT 4:17 PM
Tiny
MOELALON
  • MEMBER

Fuel pump is new. TBI model 220 4.3 L no turbo. Fp comes on for 2 seconds when cranked but won't start. No fuel to TBI. Gets fuel to new fuel filter. Relays have power to them and pump comes on okay. No damage to lines. New clean fuel in tank.

What could it be?

Started and ran good for 2 months. Idle was fast though

Was this
answer
helpful?
Yes
No
Wednesday, July 28th, 2010 AT 4:27 PM
Tiny
RASMATAZ
  • MEMBER

Check the fuel pressure with a gauge to rule out a defective new fuel pump if okay -also check if the injectors are pulsing

Was this
answer
helpful?
Yes
No
Wednesday, July 28th, 2010 AT 5:45 PM
Tiny
MOELALON
  • MEMBER

Already checked the pressure on pump 15psi. And the injectors are pulsing.

What else?

Was this
answer
helpful?
Yes
No
Friday, July 30th, 2010 AT 7:49 PM
Tiny
RASMATAZ
  • MEMBER

If the injectors are pulsing it should be getting fuel to the cylinders-you can see this while cranking it over if so-Check if you are getting spark

Was this
answer
helpful?
Yes
No
Friday, July 30th, 2010 AT 7:54 PM
Tiny
MOELALON
  • MEMBER

I am getting spark. Fuel is not flowing to TBI. No fuel is coming through fuel line at TBI carburator.

Was this
answer
helpful?
Yes
No
Friday, July 30th, 2010 AT 8:17 PM
Tiny
RASMATAZ
  • MEMBER

Already checked the pressure on pump 15psi. And the injectors are pulsing.

How did you get the fuel pressure and how did you do it.

You got fuel pressure that's over 2psi, injectors are opening and closing meaning its pulsing *****( fuel is not flowing to TBI )***** I don't understand this part

Was this
answer
helpful?
Yes
No
Saturday, July 31st, 2010 AT 2:11 AM
Tiny
MOELALON
  • MEMBER

Hi,

I tested the fuel pressure at the fuel filter.

I disconnected the fuel line at the carb. Or TBI as it is called on this model. There is no gas flow to the throttle body injector.

Was this
answer
helpful?
Yes
No
Saturday, July 31st, 2010 AT 8:49 AM
Tiny
RASMATAZ
  • MEMBER

If you are gettig fuel pressure up to the TB and injectors are pulsing and not going thru replace the fuel pressure regulator to do this you have to replace the fuel metering body

Was this
answer
helpful?
Yes
No
Saturday, July 31st, 2010 AT 9:06 AM
Tiny
MOELALON
  • MEMBER

I just said that I WAS NOT getting fuel pressure to the TB

read the thread again. You don't seem to understand

Was this
answer
helpful?
Yes
No
Saturday, July 31st, 2010 AT 7:16 PM
Tiny
RASMATAZ
  • MEMBER

If you're not getting fuel pressure up to the TBI then your fuel pump is defective-you got me confused here

Was this
answer
helpful?
Yes
No
Saturday, July 31st, 2010 AT 8:47 PM
Tiny
RASMATAZ
  • MEMBER

Moelalon Posted: Fri Jul 30, 2010 6:49 pm Post subject: 1992 Safari Van

Already checked the pressure on pump 15psi. And the injectors are pulsing.

What else?

Dunno know where you stole your 15 psi this the problem that's giving me the curve ball either you have it or not and thanks for your negative feedback. Be advised I know this TBI back in the early 80's in and out been in this business 41yrs and still at it. Your the one that needs to comprehend your problem, not me am just here to help you all the way as possible-You are one backing stabbing person. You will shoot a person behind his back not looking. Do you want your donation back? How much was it and I'll return it-don't need your nickel and dimes. The problem is right under your noise-BTW I almost forgot I've rendered my services to you and you ain't getting it back-you still owe

Was this
answer
helpful?
Yes
No
Saturday, July 31st, 2010 AT 9:04 PM

Please login or register to post a reply.

Related Fuel System Pump Test Questions

Recommended articles