INCORRECT FUEL GAUGE READING CHECK FOR 1987 FUEL TANK

VEHICLES AFFECTED: 1986 C/K 1500-3500 TRUCKS

Some late built 1986 C/K trucks may have been built with 1987 fuel tanks. The 1987 fuel tank contains a fuel baffle which can cause interference with the fuel sender float arm and not allow the fuel gauge to read below 1/4 tank of fuel. If the truck is equipped with dual fuel tanks, this condition can occur in either tank.

If this condition is encountered, the fuel tank must be replaced. The 1987 fuel tanks can be identified by removing the fuel tank and fuel tank sender and checking for the reservoir (plastic) which is attached to the bottom of the tank by two studs which are approximately 10 cm (4 in.) from the center of the fuel sender unit, See Figure 1. Refer to Service Manual, section 6C System for fuel tank removal and reinstallation procedures.

Parts Information

Part Number Description Application Quantity

14071994 Fuel Tank 1986 C,K 1,2,3 right hand, 1 left hand all engines, 60 litre (16 gallon) tank

14071984 Fuel Tank 1986 C,K 1,2,3 right hand, 1 left hand all engines, 76 litue (20 gallon) tank

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.