Just replaced the Spider Injector, Fuel pump, and fuel filter on 2000 Blazer 4x4
#21
"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.
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.
#25
Last edited by tlamana; 05-29-2015 at 10:59 PM.
#29
1995 and older VIN "W" are CPI, (Central Port Injection). There is one fuel injector, and a poppet valve at each intake port. There is no upgrade for this system. The video is 1996 or newer which is CSFI, (Central Sequential Fuel Injection) also VIN "W". There are 6 fuel injectors in the metering block, with poppet valves at each of the intake ports. The upgrade to MPI, (Multi Port Injection) can be done on 1996 through 2002. It relocates the injectors to the intake ports and eliminates the poppet valves. 2003 through 2005 S&T body 4.3L originally came with MPI and the 8th character in the VIN is "X".