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GM says you can use a fuel filter oddly enough,
25055032
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VENTING REAR AXLE ASSEMBLY
1.Disconnect rear axle vent hose and vent at attachment to box floor cross sill or frame and axle housing. Typical attachments are shown in Figures No. 1A and 1B. Various other att achments are possible depending on axle size and model year.
2.Replace vent with filter, P/N 25055032, and secure to vent hose with a screw clamp, P/N 797923.
3.Install clamp on the body of the filter and install filter on the box floor (body floor)
cross sill one rib REARWARD of the axle housing using the existing bolt.
Filter outlet should face rearward. See Figures No. 2A and 2B.
4.Install
38 inches of 5/16 inch hose, P/N 9438315, on the filter securing with a screw damp.
5.Route the hose REARWARD to the left side frame rail and secure using plastic fasteners (ties). Let hose hang downward within left frame rail.
VENTING FRONT AXLE
1.Remove clamp holding the vent hose to the radiator support. See Figure No. 3A.
2.Remove the plastic vent from the hose and install filter, P/N 25055032, and secure with screw clamp.
3.Install six inches of 5/16 inch hose, P/N 9438315, on the filter with a screw clamp and relocate the filter to the canister attaching bracket. Let end of hose hang downward from filter. See Figure No.3B.
