Engine - No Start On Incline
Number 87-6 (Gasoline)-21 Date 3/87Subject: ENGINE NO START ON INCLINE
1985-87 6000 MODELS WITH 2.8L MPFI V-6 (VIN CODE W)
Some 1985-87 6000 models equipped with a 2.8L MPFI V-6 engine may exhibit a no start condition when parked in a nose down attitude of approximately 15 degrees with less than a quarter of a tank of fuel.
This condition may be caused by air/fuel vapor ingestion through the vapor rejection port of the fuel pump resulting in fuel starvation.
Vehicles exhibiting this condition may be repaired by installation of an intank fuel pump that incorporates usage of a vapor rejection port with an umbrella check valve.
Service kits which include pumps with this feature are noted below by applicable model year and are available from GMSPO.
Model Year Part Number
1985-86 25115689
1987 25115465
Use applicable Labor Operation Number and Time.