K 2500 Truck 4WD V8-379 6.2L DSL VIN C FI (1989)
Figure 2 - Former Configuration (Pre-1990) w/Restriction Switch IT.13
Beginning with the start of production for all models listed above, the vehicles were built with a fuel filter base that no longer contains a restriction
switch (vacuum sensor). It can be seen that the restriction switch labeled as number 13 in Figure 2 has been deleted from the present configuration as
shown in Figure 1. The model 80 fuel filter base has the same exterior form.
The Service Part number has not changed. Therefore, fuel filter bases ordered through GMSPO will not have a restriction switch. When installing a new
fuel filter base on a 1989 or earlier model the restriction switch connector from the wiring harness will not be connected to the fuel filter base. The
unused connector should be taped back to the wiring harness to prevent damage.
