Bonneville (Sedan)

FIGURE 1:

The 1988 Bonneville models built after VIN JW253387, were assembled with turbine design fuel pumps which greatly reduce or eliminate fuel pump noise.

Vehicles built prior to JW253387 which have fuel pump noise and could not be corrected by proper fuel tank isolation and/or a new double convexed metal cover pulsator, Part Number 25094266 (see Figure 1), may also require a turbine style fuel pump. However, because of their larger diameter, they must either be installed as a complete assembly, or mounted to the appropriate fuel sender listed below:

FIGURE 2:

1987-88 Bonnevilles Built
Prior to VIN JW253387 Part Number

Complete Fuel Pump/Sender Assembly
(Digital Dash) 25092921
Complete Fuel Pump/Sender Assembly
(Non-Digital Dash) 25092922

Replacement Components:

Fuel Sending Unit Kit
(Replaces Digital and Non-Digital) 25094732
Fuel Pump Kit 25116144
Pump To Sender Retaining Clamp 25527699
Identification Label Codes if a Turbine
Pump has been installed (See Figure 2) CPB or CPC

1988 Bonneviles Built Built After VIN JW253387

Replacement Components:

Fuel Sending Unit Kit 25093316
Fuel Pump Kit 25116296
Pulsator 25094266
Identification Label Codes if a Turbine
Pump has been installed (See Figure 2) CPD, CPE or CPP

FIGURE 3:

All of the above part numbers are currently at GMSPO, except 25116296 which is expected to be available on September 9, 1988. Until then normal part orders will not be accepted by GMSPO.

NOTICE: Turbine fuel pumps do not mount to roller vane (non-turbine) pump senders (see Figure 3). When making repairs or ordering parts, it can be determined if a turbine design pump is in the vehicle prior to removing it from the fuel tank by inspection of the identification label. Compare the identification label codes listed in this bulletin with those on the sender harness of the vehicle. Any identification code other than those listed would indicate a roller vane design pump is in the vehicle.

FIGURE 4:

When installing a turbine pump in 1987-88 Bonneville models, make certain the fuel pick-up screen is parallel with the edge of the float, and the pump to sender retaining clamp is positioned close to the float arm, yet not interfering with the float arm's movement (see Figure 4).

FIGURE 5:

When replacing fuel pump/sender assembly components on 1988 Bonneville models built after VIN JW235386, place the fuel pick-up screen at a one o'clock position when compared to the fuel level float, and position the pulsator so its metal cover faces directly opposite the pick-up screen (see Figure 5).
WARRANTY INFORMATION

Use applicable labor operation number and labor time.

FIGURE 6:

To install either design turbine pump assembly in the fuel tank, bend the fuel pick-up screen upward while rotating and maneuvering the pump/sender assembly into the tank.