Fuel control problems/ send to HMAC300

  • 12 POSTS
  • 1996 GMC JIMMY
  • 4.3L
  • 6 CYL
  • 4WD
  • 120,000 MILES

1996-4.3l vortech-csefi system. W engine, OBD ll, EDI system
On the last question it seems the fuel pressure regulator is suspect. Can the fuel pressure regulator be replaced without removing the air intake plenum? Can it be reached through the fuel meter body while
leaving the fuel meter in place or must the entire unit be removed to gain access? Fuel pressure 61psi. Falls of instantly. Will not hold at all.
I am seriously considering conversion to carburetted. Edelbrock #2114 & 500cfm. Comments? Am aware of complete change of much. Perhaps not all, but most. Have a couple of questions if you consider viable.
Lets assume the auto will be off the road use only. That said, still must be tractable as if intended as every day driver.
You can see that this repair has been put off but now we are on the move. Thak you, Jim jddingo

Do you
have the same problem?
Tuesday, January 14th, 2014 AT 12:54 PM

1 Reply

  • 49,692 POSTS

Fuel pressure on your truck should be 60-66 psi but it should hold for a couple of minutes and you are saying it's not so it is probably the regulator. However it cold aslso be the pulsator/damper in the pump bu tyo have said that was changed. If you need to replace th regulator yo only needto pull the very top of plenum off to replace the regulator. It sits on the side. You could try pulling the throttle body off and doing it that way but they arehled in place by a snap ring so may be hard to get in all the way and put snapring back on. You wold only need the two orings for the top plenum replaced. If you decide to put a carb on you will need to disconnect your fuel pump and replace it with one that is more compatible. Butnot sure edelbrock makes an intake for this. They probably do. Of cours the computer may give you fits as it won't see any tps, or maf or map values. Carbs are simpler of course. That part is up to you as still in the trade I cannot tell you to modify your vehicle because of finesfor not meeting emission requirements. Regulators are from $35-50 depending on type and gaskets are like $30 so time is the big thing here which you have been messing around with for quite some time now. And are probably getting quite frustrated. If you go the edelbrock route i'm sure you are looking at $500 at least whereas the fix now is about $100. Good luck.

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Tuesday, January 14th, 2014 AT 1:30 PM

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