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1991 Blazer. How do I replace the fuel filter?

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Claude Kayser

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I have a 1991 chevy s-10 blazer 4.3 engine. The fuel injectors are not spraying out any gas at all. I have already replaced the TP Sensor, Fuel Filter Regulator, and the Fuel Injectors still Im not getting...


need to see if the fuel pump is working and has electricity going to it if its and fuel is reaching to the injectors but they still do not spray gas then you need to change the ECM unit thats the computer.

Aug 31, 2011 | 1991 Chevrolet S-10

1 Answer

Does a 1991 chevy s-10 blazer have inline fuel pump?


  1. Place wheel chocks behind the passenger side wheels, and lift the driver side of the Blazer with a floor jack. Place jack stands under the frame, and lower the vehicle onto the jack stands. Supporting the truck with the jack stands in this manner prevents injuries that occur if the floor jack fails.
  2. 2 Remove the fuel filler cap, and turn the ignition key to the off position. This relieves some of the fuel pressure on the system, and prevents the fuel pump from starting when the filter is removed.
  3. 3 Locate the fuel filter on the driver side frame rail, just behind the front door. The filter is a cylindrical shaped part, about six inches long, that's in the fuel line on the inside of the frame rail.
  4. 4 Place a drain pan under the filter to catch any fuel that spills. Loosen the filter fittings by using a 21mm wrench to hold the filter while turning the flare-type nut on the line with a 16mm wrench. Remove both sides of the fuel line from the filter and drain it into the drain pan.
  5. 5 Check the rubber O-rings located on the fuel line ends for tears and nicks. Replace any O-ring seal that shows damage. These seals are available at your local auto parts store.
  6. 6 Insert the fuel lines into the ends of the new filter, and thread the flare-nuts into the filter by hand. Be careful not to cross-thread them and cause the need for replacement fuel lines. Tighten both lines with the 21mm and 16mm wrenches.
  7. 7 Raise the truck off the jack stands with the floor jack, and remove the stands from under the vehicle. Lower the Blazer to the ground. Reinstall the fuel filler cap.
  8. 8 Turn the ignition key to the "Run" position--and then back to the off position--three times to prime the new filter. Each time the key is turned to the "Run" position, the on-board computer turns the fuel pump on and opens the injectors to add fuel for starting. Start the engine and check for fuel leaks.
Waterbed Pump Video Inst.


This has an electric fuel pump located in the gas tank.

To replace or check it you do one of 2 things. You can drop the tank or cut a hole in the cargo area to gain access as they are on the top of the tank.I would not suggest cutting hole


Dec 09, 2010 | 1991 Chevrolet S-10 Blazer

1 Answer

1991 Chevy S-10 pickup It hard to start in morning only.


please change you fuel filter,it may be dirty but you might have filter with a small leak may not be leaking on the ground but a very small leak that it can get air and lose prime

Sep 14, 2009 | 1991 Chevrolet S-10 Blazer

1 Answer

1991 S-10 Blazer replaced leaking fuel tank


Maybe the system needs to be bled, an air pocket somewhere?? Tey bleeding the fuel system.

Jun 10, 2009 | 1991 Chevrolet S-10 Blazer

1 Answer

Will not hold idle when in drive or reverse 1991 S10 Blazer


Well Boys
If I tell you how to fix the S10 Problem are you going to send me $10.00Regard.

Regards,

Nov 27, 2008 | 1991 Chevrolet S-10 Blazer

1 Answer

1991 chevy s10 blazer


Check the fuse under the dash. Did you replace the inline fuel filter? If not, you could loosen the line going into the filter then turn the key to the on position. The pump should run for about 2 seconds then the relay should kick off. Turn off the key for approx. 5 seconds then cycle key back on and the pump should cycle again. If you get a 2 second burst of fuel each time then the pump is cycling. Install a new fuel filter and check the grounded wire by the tank. Hope this helps. :)

Nov 03, 2008 | 1993 Chevrolet S-10 Blazer

1 Answer

1991 Chevrolet S-10 Blazer starts but won't run for long.


dave when is the last time you did a tune up? or cleaned the fuel system

Nov 01, 2008 | 1991 Chevrolet S-10 Blazer

1 Answer

91 chevy s-10 blazer


sounds to me like water may have possibly gotten into the engine spark plug areas and are preventing the engine from sparking.

Jul 28, 2008 | 1991 Chevrolet S-10 Blazer

1 Answer

Will not Idle


ok so you did a full tune up. ok well, the throttle positions sensor (tps) may not be good. or the gas needs some cleaning use some tune up in a bottle trust me it works great.

Jun 17, 2008 | 1991 Chevrolet S-10 Blazer

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