Question about 1992 GMC Jimmy

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Gass is not going in to intake

I have gass presur just befof the spider injection but none in side .
the motor will run if i spray gass in the air intake . we just replaced the fule pump

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Souds like you need to replace the SPI unit (the spider). Also make sure you have the proper fuel pressure, otherwise it will not open the poppets on the SPI unit. I think Min pressure is 60 psi.

Posted on Oct 08, 2009

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Please check your fuel filter and replace. Sometimes gas cannot get through a dirty or clogged fuel filter.

Posted on Oct 08, 2009

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1 Answer

What will cause motor not to start and smell like gas on 1995 chevrolet blazer 3.8liter vortex


check for gas leak if none found these had a problem with the spider injection system inside the intake cracking causing a leak and no start due to the poppet injectors not opening due to weak fuel pressure. these operate at 56lbs pressure and its critical.

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1994 4.3 tbi spray problems


Yes very common problems with the "spider" fuel injection unit.
Remove the top of the intake manifold to access the FI "spider unit"
The injectors can be replaced separately. Also sometimes it's the pressure regulator that's bad, and leaking so check for that too.you can check the injector spray pattern if you are careful doing it.(disable the coil, have lots of rags and a friend crank the motor while you check the pattern of each injector) (hint - if you are really cheap you can actually "clean" the end of the injector with a small screwdriver , try to roll the ball around to remove varnish, then recheck the spray pattern.

Nov 22, 2013 | 1993 Chevrolet C1500

1 Answer

My Chevy 2500 p/u will only start and run when I pour gas in the carb...if I kill it for 2 minutes , I have to do it again to get it started ...uhg..frustrating !!! One guy told me it was a spider sumthing...


Lets start with terminology. I am assuming the truck is newer than 1987 so you would have fuel injection. No carb.
If it is a vortec engine, either a 4.3 or larger, and built after 1993, it could have central port fuel injection. That style uses one injector and a spider of lines that go to each intake port. This is inside the upper intake manifold.
Vortec engines require more fuel pressure than engines with port fuel injection or throttle body injection. So the first thing you need to do is check base fuel pressure before and after you crank the engine. You'll need a pressure gauge to do it. Normal fuel pressure at idle for a port injected engine is 35psi and 60psi for a central pfi system.

Jun 24, 2013 | Cars & Trucks

1 Answer

1992 GMC 1500 pickup


that should have throttle body fuel injection run the engine with the air filter off and watch the injectors spray fuel to see if there a cone shaped spray if ok check the fuel pressure i have seen the regulator rupsure and the fuel dumps into the engine

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2 Answers

When i take the intake plenum off, there is fuel sitting in the left hand side(fuel press regulator side) 1995 chevy blazer. the fuel injection got replaced last summer and i replaced the regulator a month...


Wow, that's interesting, I'm trying to think how you could be getting gas in the oil. I'm guessing the gas on top of the motor is coming from a leaking O-ring. You maybe have a nick or tear in one of the O-rings in that area. It might only leak at certain temperatures with things expanding and contracting. Try wiggling some of the lines and fuel pressure regulator to see if you can make the leak a little more obvious. As far as gas in the oil the only thing that I can think of is leaky injector and the gas running down past the piston rings. I guess it could leak down past the intake manifold into the lifter valley but, I find that hard to believe. Good luck with that one, have a Happy New Year!!!

Dec 31, 2009 | 1995 Chevrolet Blazer

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.

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2 Answers

1982 spider will not start no fuel injection


the injection relay,if memory serves me correct there is a bank of three under a cover on the offside front wing but i carnt remember which one it is but they are all the same

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2 Answers

How to manually get a trouble code out of a 95 blazer with vortec


The vortec motor has been known for the so caller spider assembly which is the fuel injection set up inside the intake manifold going bad.The regulator starts leaking wich puts extra fuel into the motor.If that is it you should change the whole assembly.

Nov 30, 2008 | 1995 Chevrolet Blazer

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