1999 Chevrolet Blazer


Beth Aloha

March, 25, 2009 AT 9:22 PM

Engine Mechanical problem
1999 Chevy Blazer 6 cyl Automatic

How hard is it to drop the gas tank and change the fuel pump? Is there any where online where I can get step by step instructions? Any advice is very much appreciated.


2 Answers



March, 25, 2009 AT 9:31 PM

Replacement instructions are below. Let me know if you need further assistance.

REMOVAL: Properly relieve the fuel system pressure.
Connect the negative battery cable.
Drain the fuel tank, then remove it from the vehicle.
Using the GM fuel gauge sending unit retaining cam tool No. J-24187, J-36608 (or equivalent) or a brass drift and a hammer, remove the cam locking ring (fuel sending unit) by twisting counterclockwise. With the locking ring released, carefully lift the sending unit from the fuel tank.
Remove the fuel pump from the fuel sending unit, by performing the following procedures: Pull the fuel pump up into the mounting tube, while pulling outward (away) from the bottom support.

When removing the fuel pump from the sending unit, be careful not to damage the rubber insulator and the strainer.

When the pump assembly is clear of the bottom support, pull it out of the rubber connector.

INSTALLATION: Inspect the fuel pump hose and bottom sound insulator for signs of deterioration, then replace, as necessary.
Push the fuel pump onto the sending tube.
Using a new sending unit-to-fuel tank O-ring, carefully lower the sending unit/fuel pump assembly into the fuel tank.

When installing the sending unit, be careful not to fold or twist the fuel strainer or it may restrict the fuel flow.

Secure the sending unit by turning or driving the lockring clockwise and into position under the tabs.
Install the fuel tank assembly to the vehicle.
Connect the negative battery cable and check for proper pump operation.

Thanks for using 2CarPros. Com!



March, 25, 2009 AT 9:37 PM

1. Fuel pump is located in fuel tank and is integral with fuel sending unit assembly. Fuel pump must be replaced with fuel sending unit as an assembly. Relieve fuel system pressure. Disconnect negative battery cable.

2. Raise vehicle and support vehicle. Disconnect fuel lines and electrical connections at fuel tank. Remove fuel tank. Remove fuel sending unit assembly retaining ring or cam lock ring. Lift fuel sending unit assembly from fuel tank. To install, reverse removal procedure using NEW " O" ring and gasket

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