Fuel - No Start/Blown Fuel Pump Fuse, Check RFI Filter
Number 85-6 (Gasoline)-22A Date 5/85Subject: IN-TANK ELECTRIC FUEL PUMP RFI FILTER
1985 6000, PARISIENNE, FIREBIRD, SUNBIRD, GRAND AM & FIERO
Some 1985 6000, Parisienne, Firebird, Sunbird, Grand Am and Fiero models may experience a no run or no start condition, and/or blown fuel pump fuse due to an inoperative In-Tank Electric Fuel Pump, which may be due to a short in the radio frequency interference (RFI) filter. The RFI filter is located on the electrical input terminals of the in-tank electric fuel pump.
To check, disconnect the three wire connector at the fuel tank and measure the resistance between the two outside wires of the connector going to the tank (black and tan). A resistance measurement of 3 to 4 ohms indicates a good unit.
To check further, remove the tank unit assembly and measure the resistance of the RFI filter and pump assembly individually.
Resistance of good RFI filter - infinity (open circuit) Resistance of good electric motor - 3 to 4 ohms
If the RFI filter is shorted, replace filter with kit P/N 6472779.
If electric motor is inoperative, replace pump with appropriate kit package part number for vehicle being serviced.