Question about 1994 GMC Jimmy

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Fuel pressure regulator

HOW DO YOU REPLACE FUEL PRESSURE REGULATOR IN 1994 GMC JIMMY?4.3L 262 CID (W) VORTEC.
IS THERE A DIAGRAM OF THIS FUEL SPIDER?

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  • Anonymous Dec 01, 2008

    la linea de gasolina se descarga en un lapso de una hora y se dificulta el encendido

  • Laurieeluna Dec 30, 2008

    yes i have the same problem.

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  • 63 Answers

How do you know that it is the regulator?
these 4.3 motors had a lot of trouble from 93 to 98, I know I had 2 of them.
What happened to mine was that the intake kept getting very carboned up. After I would clean it, the truck would run fine for about 5 or 6 months, then same thing.
Theres actually a class action lawsuit about this that I believe has been settled, you may have recourse if you bought it through a dealer. Good luck.You'll need it.

Posted on Dec 23, 2008

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4 Answers

In need to change the fuel pressure regulator but I need to know where a 4.3l engine


The fuel pressure regulator is mounted inside the intake plenum. You'll have to take the top half of the intake plenum off and replace the fuel injection spider.

daves944_4.jpg

Jan 16, 2011 | 1996 GMC Jimmy

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I have a gmc jimmy that will not run it keeps flooding out we replaced the spider under the intake and the fuel presure reg. but still dumps fuel like a stuck pig any suggestions


put a fuel pressure guage on it and turn the key to on, the pressure should build and hold if not you may have a leaking injector or injector seal

Nov 20, 2010 | 1994 GMC Jimmy

1 Answer

1994 gmc jimmy need wiring diagram for blinker and wipers


its got a 4.3 vortec in it i think got a piece in the intake called a spider that acts like fuel injecors probley not oppening up to let fuel into the motor also has a fuel presure regulator built in it there kinda pricey but that more than likely your problem

Mar 24, 2010 | 1994 GMC Jimmy

1 Answer

What is a Vortec engine?


The "spider" injector is the problem. You're right that one of the injectors is stuck open, unfortunately it has to be replaced as an assembly. This a common problem on the Vortec V-6's. When you were checking the fuel pressure, the fuel was passing through the open injector, giving you a low reading. After replacing the injector assembly, be sure to change your oil before you start the engine. I'd be willing to be you have a pint or two of gasoline that has gotten into the crankcase. That injector unit will cost you around $350. It's not too hard to put in, just be careful.

Feb 20, 2010 | 1994 GMC Jimmy

1 Answer

Were is the fuel pressure regulator located on my vehicle? Is there a picture or a diagram? 1994 GMC Jimmy 4.3 Vortec


the fuel pressure regulator is located inside the intake. you have to remove the upper intake to access the regulator. the black plastic intake is what you need to remove.

Feb 13, 2010 | 1994 GMC Jimmy

1 Answer

I have a 1992 GMC Jimmy CPI. well it dumps alot of fuel and runs like **** from idle till about 2500 rpm. there is always gas in the oil after a while also. ive given it a tune up and everything. it has to...


Is this the Vortec engine? If so, the fuel injector spider, has a built in pressure regulator and i would say it is spraying way too much fuel into the cylinders. At the same time is is washing your cylinders of lubrication, and that itself is not good.

Feb 01, 2010 | 1992 GMC Jimmy

2 Answers

93 gmc jimmy 4.3 vortec has a flooding problem. I pulled the injectors from the motor and turned the key on and excessive amounts of fuel sprayed out. could that be caused by the spider?


The most likely 2 causes are leaking fuel pressure regulator on the side of the spider, or leaking fuel LINE going into or out of the spider. Both are reasonably common failures. a replacement spider would come with a new regulator but NOT a new line, so verify which is leaking before you order a spider up.

They do not fail that often anymore, not like 5 or 8 years ago when gasoline still had mtbe in it, the vortec unit is very dependable nowadays.

Sep 16, 2009 | 1993 Chevrolet S-10

1 Answer

I have a 95 gmc jimmy with a 4.3 vortec v6. About two weeks a go i replace some hoses on the spider assembley (fuel inj assem.) they had rotted a hole in them so i went an got new ones. then just a few...


i would first check the fuel pressure regulator pull off the vacume hose see if fuel comes out ? if so replace regulator if not double check for stuck injectors ? seen bad contaminated fuel cause similar problems ? hope this helps

Aug 28, 2009 | 1994 Chevrolet K1500

1 Answer

How to replace spider regulator on a 1999 gmc jimmy


This fuel pressure regulator is a component part of the SFI (sequential fuel injection) assembly, sometimes referred to as "spider". It resides inside of the air intake plenum and is accessed by removing the upper half of the intake. 
Good luck and hope this helps. 
Most of the time when your having problems, it's most likely going to be the whole spider unit. GM has been know to have problems with this type of fuel injection system. 
Check the vacum line to the fuel pressure regulator at the back of the spider housing by the high pressure fuel line. You can see it just in front of the distributor cap and spider assembly.

Apr 23, 2009 | 1999 GMC Jimmy

2 Answers

1994 jimmy fuel shutown @spider?


Hi

A very common failure on these is the CPFI unit , or SPIDER as people like to call it.

There is one single injector which feeds each cylinder via a pipe and poppet. The injector becomes blocked and the engine won't start or run.

Before you go condemning this though, just make sure you have good fuel pressure because the fuel pressure regulator or fuel pump could also have a hand in the problem. Make sure the pump is running, and if not then check the fuse, the relay, and the pump itself.

Very best regards

Geordie

Jun 18, 2008 | 1991 GMC S-15 Jimmy

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