the spider is what receives fuel from the pump and sends it to each cylinder. its like an injector but it has poppets that sprits fuel into the chambers. it literally looks like a spider and its located under the plastic intake plenum along with the fuel pressure regulator the 2 metal fuel lines that run into the top of the engine are bolted to the top of the spider

 

Thanx!


Whats the official name for it? Does it help with gas mileage? From what I've heard, when it comes to parts, stick with AC Delco or Delphi right?

 

"Fuel metering block" is the technical term for it. The 1996 through 2002 OEM S&T body have 6 mini fuel injectors inside. Each injector directs fuel through the "spider" lines to a poppet valve located at each intake port. 2003 through 2005, (and the upgrade) relocates the injectors to the intake ports, and eliminates the poppet valves.

If the OEM spider assembly poppet valves are clean, and the assembly has no other problems, you might notice a slight difference in performance & fuel mileage using the upgraded version. Usually the OEM is replaced due to a problem, that's when you notice a substantial difference when upgrading.

 

Got it!


Was looking at RockAuto and I saw something they said was an upgrade. Is the upgrade a direct bolt on?

 

Yes, the upgrade is plug & play.

 

I got my injector upgrade and plenum gasket kit for $312.99 USD total from rockauto shipped to Canada. Was going to put it into my 2001 that I'm now parting out but now I'll put it in my '99 when and if I need to.

DELPHI FJ10565 Fuel Injector (8409.91.0069)
FEL-PRO MS95816 Plenum Gasket (4016.93.1910)

 

MOst of the questions were answered by folks that know what they are talking about. I did take a bunch of pictures, but the removal is a little time consuming but not terribly hard.
The best part is that the truck does NOT have any issues starting anymore.

Still haven't used a full tank of gas yet. Haven't noticed that much of a difference so far, but these crappy fuel pumps (just replaced mine) have the stupidest electronic mechanism that really is an awful design. GM should have recalled it because it is such a lousy design.
It never reads perfectly like most cars do. It sticks, it floats, it is just garbage. I used a delphi, but they all are junk, so I still have my son press the mileage and hopefully he has gas beyond 225 per tank.
We'll see

 

Just came across this thread. Aerovette99 have you noticed any better mileage now? I have all the same problems you mentioned at the beginning - hard starts, fuel gauge doesn't work, and poor gas mileage around 220/tank. I'm hoping to improve it and wondering if your fixes made any difference. Thanks

 

Gas mileage is the same. Fuel gauge issue is fuel pump, but the new one worked for 2 weeks. Hard starts are over, and that was the main thing.

 

220 miles per tank is pretty typical for a 4WD Blazer in mixed driving. 14MPG. They're definitely not gas mileage specials. Price you pay for driving an older true 4WD SUV. But then again, 40K will buy a lot of gas.

Try to drive above 50mph where the TCC will lock up. That's good for a couple more MPG. You might even get 18 or 19 MPG if you are at steady speed.

Now, hard starting and inop fuel gauge is another thing......