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How do i relieve fuel pressure to replace filter

How do i do it

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Hi: Located at the top center of the engine where the fuel line attaches to the fuel rail there is a shreader valve (capped, like a tire valve) push down on the center to release fuel pressure. (This is were they test to see if vehicle has enough fuel pressure from the fuel pump.) Gas will spray out so be cautious..... Please rate suggestion so I see if it worth my while giving suggestions... ty

Posted on Feb 26, 2009


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How do you replace a fuel filter on a 1999 Pontiac Montana?

Here's a link showing you how to replace your fuel filter. Repair Guides Routine Maintenance Fuel Filter AutoZone com

Relieving Fuel System Pressure

  1. Disconnect the negative battery terminal to avoid possible fuel discharge if an accidental attempt is made to start the engine.
  2. Loosen the fuel filler cap to relieve tank vapor pressure.
  3. Connect a suitable fuel gauge to the fuel pressure connection. Wrap a shop towel around the fitting while connecting the gauge to avoid spillage.
  4. Install the bleed hose into an approved container and open the valve to bleed the system pressure. Fuel connections are now safe for servicing.
  5. Drain any fuel remaining in the gauge into an approved container.

Oct 04, 2016 | Pontiac Cars & Trucks

1 Answer

How do I know if I need to replace the fuel pump on a 2000 jeep grand Cherokee laredo 4.0

Hi Rebecca,what is happening to think your fuel pump is bad,it may be a clogged fuel filter,usually change it first and see if it does better.Here's a link to replace the fuel filter. Repair Guides Fuel Filter Removal Installation AutoZone com First you must relieve the fuel pressure,here's how. Repair Guides Relieving Fuel System Pressure Relieving Fuel System... Here's how to replace the fuel pump. Repair Guides Gasoline Fuel Injection Fuel Pump AutoZone com Also check your air filter too.Also your fuel injectors could be dirty and need cleaning,let me know what all it's doing so we can pin point the problem,k.

Oct 12, 2014 | Cars & Trucks

2 Answers

1985 Nissan 300ZX I want to disable the fuel pump to relieve the pressure before replacing the fuel filter. Is it a relay or a fuse?

No need to remove any relay. Proceed as follows:
- Park the car in shaded and well ventilated area.
- Remove the negative battery terminal.
- Loosen the fuel cap, fuel filter banjo bolt, push on or pipe clip.
- Wrap a piece of cloth around the connecting end of the pipe and remove the pipe.
Let the engine cool down about half an hour before you proceed.
Keep your eyes away from the gasoline splash.
Keep any flame away.
Dry up the area immediately.
It is always better to get the job done by a qualified personnel.

Feb 23, 2014 | 1985 Nissan 300ZX

1 Answer

How to relieve gas pressure off fuel filter of 1994 2.2 liter plymouth sundance

disconnect power supply to fuel pump, then start engine when engine stalls fuel pressure released

Jun 02, 2012 | 1994 Plymouth Sundance

1 Answer

Honda Civic Coupe. Year 2000 1.6. How can I depressurize the fuel system easily to change the fuel filter situated in the engine compartment.


IMPORTANT: Do not skip the fuel system pressure release step. Injury and other damage can result!
Safety Step! Relieving Fuel System Pressure
· allow engine to cool
· relieve fuel system pressure
· put on your eye protection
Before you begin the job of replacing your fuel filter, you must relieve the pressure in your fuel system. A fuel injection system operates under very high pressure. If you don't release this pressure before you start unscrewing fuel lines the result can be explosive. Do this before you attempt to change the fuel filter.
To release the pressure in your fuel lines (and fuel filter) you'll need to locate the fuel pump fuse in the fuse box. If you don't have a fuel pump fuse, find the relay that operates the fuel pump. Once you've found the fuel pump fuse or relay, start the car. With the engine running, pull the fuse or relay out. If you pulled the right one, the engine will quickly die. Since it's using all of the pressurized fuel in the system, the fuel lines won't be pressurized when you crack the fittings on your fuel filter.
Now that you've relieved the fuel pressure you can remove the old fuel filter.
If you didn't do this yet, you must go to the previous step and do it. Very dangerous!

Best regards.

Oct 28, 2010 | 2000 Honda Civic

1 Answer


Pressure Relief
Special Tool(s) EFI/CFI Fuel Pressure Gauge
310-012 (T80L-9974-B) swn~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel related component. Highly flammable mixtures are always present and may be ignited, resulting in possible personal injury.
swn~us~en~file=ani_caut.gif~gen~ref.gif WARNING: Fuel in the fuel system remains under high pressure even when the engine is not running. Before servicing or disconnecting any of the fuel lines or fuel system components, the fuel system pressure must be relieved to prevent accidental spraying of fuel, causing personal injury or a fire hazard.
  1. Remove the schrader valve cap and attach the EFI/CFI Fuel Pressure Gauge.
  2. e5e3ebf.gif
    NOTE: Open the manual valve slowly to relieve the system pressure. This may drain fuel from the system. Place fuel in a suitable container.
    Open the manual valve on the EFI/CFI Fuel Pressure Gauge slowly and relieve the fuel pressure. 9deacdd.gif
    Filter Removal
    1. Relieve the fuel pressure; refer to Above.
    1. Remove the fuel filter (9155).
      1. Disconnect the fuel lines
      1. Remove the fuel filter from the fuel filter support.
      2. b717c63.gif
      1. Push Connect Fittings
        Special Tool(s) Fuel Line Disconnect Tool
        310-S039 (T90T-9550-S) 4bbcf9e.gif
        1. Relieve the fuel pressure; refer to Pressure Relief in this section.
        1. Disconnect the safety clip from the male hose.
        2. Install the fuel line disconnect tool and push into the fitting. f0af03c.gif
          Install the fuel line disconnect tool and push into the fitting. 367328f.gifSeparate the fittings.
          • Inspect for damage.
          • Clean the fittings.
          • 3beef33.gif

Sep 02, 2010 | 1998 Ford Explorer

1 Answer

How do I change the fuel filter

Fuel Filter REPLACEMENT It is recommended that the fuel filter be replaced periodically. The filter is of one-piece construction and cannot be cleaned, so it must be replaced. Carbureted Engines Fig. 1: View of the fuel filter used on carbureted engines 85551036.gif
  1. Remove the air cleaner.
  2. Loosen and remove the fuel tube from the filter.
  3. Unscrew the filter from the carburetor.
  4. Apply Loctite® or equivalent to the external threads of the new filter and screw the filter into the carburetor.
  5. Hand-start the tube nut into the fuel filter. While holding the filter with a wrench to prevent it from turning, tighten the fuel line tube nut.
  6. Start the engine and check for fuel leaks.
  7. Replace the air cleaner.
Fuel Injected Engines Fig. 2: Exploded view of the fuel filter mounting on fuel injected engines 85551037.gif
Fig. 3: Use a hand vacuum pump to relieve the fuel system pressure 85551038.gif Fig. 4: Exploded view of the fuel inertia cut-off switch and its location 85551039.gif
Fig. 5: Exploded view of the 5⁄16 in. hairpin clip type quick-disconnect coupling 85551040.gif
Fig. 6: Connecting and disconnecting the garter spring type quick-disconnect couplings 85551041.gif
Remove the fuel filter mounting bracket retaining nuts . . . 89681p04.jpg. . . then loosen the filter retaining clamp and slide the bracket assembly back . . . 89681p05.jpg. . . to provide better access to the push connect fittings (arrows) 89681p06.jpgWith a rag positioned to catch any spilled fuel, disengage the retainer clip and remove the line 89681p07.jpg NOTE: The inline reservoir type fuel filter should last the left of the vehicle under normal driving conditions. If the filter does need to be replaced, proceed as follows: CAUTION
If the fuel filter is being serviced with the rear of the vehicle higher than the front, or if the tank is pressurized, fuel leakage or siphoning from the tank fuel lines could occur. To prevent this condition, maintain the vehicle front end at or above the level of the rear of vehicle. Also, relieve tank pressure by loosening the fuel fill cap. The cap should be tightened after pressure is relieved.
  1. Shut the engine OFF. Depressurize the fuel system as follows: On the 2.3L EFI engine, a valve is located on the throttle body for this purpose. The valve can be located by removing the air cleaner. On the 2.9L EFI engine use the following steps:
    • Remove the gas cap.
    • Disconnect the vacuum hose from the pressure regulator located on the engine fuel rail.
    • Using a hand vacuum pump, apply approximately 25 in. Hg pressure to the pressure regulator.
    Fuel pressure will be released into the fuel tank through the fuel return hose. On most EFI engines the fuel pressure can be relieved as follows. Use special tool T80L-9974-B or equivalent attached to the pressure measuring port on the engine fuel rail. Direct the drain hose to a suitable container and depress the pressure relief button. An alternate method of relieving the fuel system pressure is to disconnect the electrical connector from the inertia switch and crank the engine for about 15–30 seconds until it runs out of fuel and dies.
  2. Raise and support the vehicle safely.
  3. Remove the push connect fittings at both ends of fuel filter. Install new retainer clips in each push connect fitting.
  4. Remove the filter from the bracket by loosening the filter retaining clamp enough to allow the filter to pass through. NOTE: The flow arrow direction should be positioned as installed in the bracket to ensure proper flow of fuel through the replacement filter.
  5. Install the filter in the bracket, ensuring proper direction of flow as noted by arrow. Tighten clamp to 15–25 inch lbs. (1.7–2.8 Nm).
  6. Install the push connect fittings at both ends of the filter.
  7. Lower the vehicle.
  8. Start the engine and check for leaks. Clean all dirt and/or grease from the fuel filter fittings. "Quick Connect'' fittings are used on models equipped with a pressurized fuel system. These fittings must be disconnected using the proper procedure or the fittings may be damaged. The fuel filter uses a "hairpin'' clip retainer. Spread the two hairpin clip legs about 1⁄8 in. (3mm) each to disengage it from the fitting, then pull the clip outward. Use finger pressure only; do not use any tools. Push the quick connect fittings onto the filter ends. Ford recommends that the retaining clips be replaced whenever removed. The fuel tubes used on these fuel systems are manufactured in 5⁄16 in. and 3⁄8 in. diameters. Each fuel tube takes a different size hairpin clip, so keep this in mind when purchasing new clips. A click will be heard when the hairpin clip snaps into its proper position. Pull on the lines with moderate pressure to ensure proper connection. Start the engine and check for fuel leaks. If the inertia switch (reset switch) was disconnected to relieve the fuel system pressure, cycle the ignition switch from the OFF to ON position several times to re-charge the fuel system before attempting to start the engine. prev.gif next.gif

Aug 13, 2010 | 1987 Ford Bronco II

1 Answer

Relieving fuel pressure on 2005 Chevrolet Tahoe

Pull out the fuel pump relay and start the engine, let it run till it goes dead. fuel pressure relieved!

Apr 25, 2009 | 2005 Chevrolet Tahoe

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