Thursday, July 28, 2011

Chevy, Gmc, S10 Blazer, Jimmy, how to check or replace fuel filter

Chevy, Gmc, S10 Blazer, Jimmy, how to check or replace fuel filter, step by step instructions with pictures.


Warning: Gasoline is extremely flammable, so take extra precautions when you work on  any part of the fuel system.

Carbureted models:

Refer to illustrations 18.6 and 18.8

1 On these models the fuel filter is located inside the fuel inlet nut at the carburetor. It's made of either pleated paper or porous bronze and cannot be cleaned or reused.

2 The job should be done with the engine cold (after sitting at least three hours). The necessary tools include open-end wrenches to fit the fuel line nuts. Flare nut wrenches (which wrap around the nut) should be used if available. In addition, you have to obtain the replacement filter (make sure it's for your specific vehicle and engine) and some clean rags.

3 Remove the air cleaner assembly. If vacuum hoses must be disconnected, be sure to note their positions and/or tag them to ensure that they are reinstalled correctly.

4 Follow the fuel line from the fuel pump to the point where it enters the carburetor. In most cases the fuel line will be metal all the way from the fuel pump to the carburetor.

5 Place some rags under the fuel inlet fittings to catch spilled fuel as the fittings are disconnected.

6 With the proper size wrench, hold the fuel inlet nut immediately next to the carburetor body. Now loosen the fitting at the end of the metal fuel line. Make sure the fuel inlet nut next to the carburetor is held securely while the fuel line is disconnected (see illustration).

7 After the fuel line is disconnected, move it aside better access  to the inlet nut. Don't crimp the fuel line.

B Unscrew the fuel inlet nut, which was previously held steady. As this fitting is drawn away from the carburetor body, be careful not to lose the thin washer-type gasket on the nut or the spring, located behind the fuel filter. Also pay close attention to how the filter is installed (see illustration).

9 Compare the old filter with the new one to make sure they're the same length and design.

10 Reinstall the spring in the carburetor body.

11 Place the filter in position ( a gasket is usually supplied with the new filter) and tighten the nut, but be careful not to over tighten it as the threads can strip easily, causing fuel leaks. Reconnect the fuel line to the fuel inlet nut, again using caution to avoid cross-threading the nut. Use a backup wrench on the fuel inlet nut while tightening the fuel line fitting.

12 Start the engine and check carefully for leaks. If the fuel line fitting leaks, disconnect it and check for stripped or damaged threads. If the fuel line fitting has stripped threads, remove the entire line and have a
repair shop install a new fitting. If the threads look all right, purchase some thread sealing tape thread sealing
tape and wrap:'tne''tt'l s with it. Inlet nut repair kits are available at most auto parts stores to overcome leaking at the fuel inlet nut.

Fuel-injected models

Refer to illustration 18. 15

Warning: See Chapter 4 and relieve the fuel system

pressure before proceeding.

13 Fuel-injected engines employ an in-line

fuel filter. The fuel filter is located under the vehicle.

14 With the engine cold, place a container,

newspapers or rags under the fuel filter.

1"5 Use wrenches .to disconnect the fuel

lines and detach the filter from the frame (see


16 Install the new filter by reversing the removal procedure. Make sure the arrow on the filter points toward the engine, not the fuel tank. Tighten the fittings securely, but don't cross thread them

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