Question about 1998 Toyota Camry

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Is there pressure relief valve on fuel system when changing the fuel filter

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Look for a tire-valve-looking pressure test port located on the fuel rail located over the injectors. Pressing the inner pin releases the pressure along with fuel--catch it in a clean can. You can also remove the fuel pump fuse, then start the engine and run it until it stops.

Posted on Sep 07, 2009

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Regardless yes if on the fuel bar is a cap remove it and a pen should do the trick and depress it without getting any on yourself by shielding it with a rag while doing so as well as loosen the gas cap too but you will be able to remove the fuel filter at this point however there will be gas in the filter still so the use of a catch basin is handy and line wrenches are suggested for removing them

Posted on Sep 07, 2009

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No there is not, but there is a pressure test port valve you can depress on the top of the engine in the supply line that goes over the tops of the fuel injectors, looks kinda like a tire valve, have a rag handy.

Posted on Sep 07, 2009

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No remove the fuel pump fuse and turn the engine over a couple times and the pressure will relief

Posted on Sep 07, 2009

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Oil Pressure gauge is all of a sudden reading 80 psi! Was reading about 60 before. No change is the way truck runs. What is happening?


May be blockage in the system caused by either Dirt or heavy build up of carbon in system but more likely the filter is doing its job and his becoming blocked.
Change the oil when it is HOT and the filter and you should be OK

Aug 03, 2015 | 2005 GMC Sierra 2500HD 4WD

Tip

Fuel systems on cars


2) Fuel: From tank to engine

The modern fuel tank is fitted with a sealed filler cap. Set within the fuel tank is the fuel level sender which sends a signal to the fuel gauge indicator on the dashboard. Fuel is drawn by a pre-pump (lifter pump),also within the tank, through a filter 'sock' or strainer to prevent bulky debris rom entering the fuel line; the pre-pump maybe located outside but near to thefuel tank. Also connecting to the tank is the fuel return pipe and often on top of the tank can also be found a pressure sensor. Associated with the tank there is often an expansion vessel to accommodate thermal expansion of the fuel. Finally attached to the top of the tank, or top of the expansion vessel, there is a fuel vapour recovery pipe that is part of the evaporative loss emission control system employed to prevent fuel vapour release to the environment (see later in this series).
Fuel is pumped from the tank by the pre-pump through the fuel line towards the engine: on some systems a further 'main' fuel pump may lie between the fuel tank and engine. The fuel, now under considerable pressure, passes through an in-line fuel filter that removes any fine particulates before they reach the engine. A clogged fuel filter puts a strain on the fuel pump so routinely changing the fuel filter can help prolong the pump's service life. On reaching the engine compartment the fuel line connects to the fuel rail mounted on the engine. The injectors feed directly off this pressurized fuel rail. Mounted onto the end of the fuel rail after the injectors is the fuel pressure relief (FPR) valve which governs the fuel pressure in the line all the way back to the fuel pump(s).
The critical component within the FPR is a spring loaded diaphragm whose role is to maintain a constant force on the relief valve. Fuel, pressurized by the action of the fuel pump, is forced against the valve and excess pressure allows fuel to bleed past to the return fuel line back to the fuel tank. Attached to the top of the fuel pressure regulator is a vacuum line connected to the inlet manifold. The vacuum partially offsets the action of the diaphragm spring. When the engine is at idle, the throttle plate is closed and the manifold vacuum is at its greatest (lowest pressure), the strong vacuum sucks back on the diaphragm against the spring pressure allowing a reduction in the fuel pressure needed to open the relief valve. This reduction in fuel pressure helps minimize fuel consumption per each injection cycle when at idle. Conversely, when the engine is running at high speed, the throttle is wide open creating little or no vacuum in the plenum. This reduces the pull back on the FPR diaphragm and consequently the fuel pressure in the fuel rail is at its highest.
In 'common rail' designs the injectors are controlled by the ECU. The ECU controls the injection cycle time (pulse width) and, in very modern systems, the actual injection pattern. When the car is at idle the injection times are short and when under load the injection times are longer. Similarly when the engine is cold (as indicated by the engine coolant sensor to the ECU) the injection times are longer to ensure a richer starting mixture. The combination of injection time, along with the fuel pressure in the fuel rail, dictates the engine speed and fuel consumption.
In recent years evaporative loss emission control systems (EVAP) have been introduced to prevent the escape of fuel vapour from cars. The fuel vapour that evaporates from the surface of the fuel in the tank is conveyed by the vapour relief pipe to a charcoal filled canister. The fuel vapour is stored in the charcoal for later use by the engine. Access to the stored vapour held in the canister is controlled by electrically operated valves. When the engine is cold the charcoal canister purge valve is kept closed. At normal operating temperature (signalled from the coolant temperature sensor to the ECU) the purge valve opens allowing the stored vapour to contribute to the air in the inlet manifold. The charcoal canister also has a vent valve operated either electrically or passively, in response to internal pressure drop, which when open introduces fresh air to help flush residual vapour out of the charcoal canister.
NEXT 3) Spark: from battery to spark plug

on Jul 15, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

I have dodge grand caravan sport the check engine is on the code is P0172 say sistem too reach bank 1


code p0172 refers to system too rich bank 1===causes --intake blocked (air filter) EVAP canister purge valve---fuel pressure---EGR system--injectors--HO2S (oxygen sensor). The first thing to check would be the oxygen sensor and air filter. Then check the fuel pressure in the fuel manifold to check for fuel pump/filter/ pressure relief valve that may be causing an injector fault

Sep 28, 2013 | Cars & Trucks

1 Answer

I am changing the fuel filter on a 2005 ford freestar, I want to know how to relieve the fuel pressure . do i just remove the fuel cap or is there a fuel pressure relief valve in the engine bay.


Please don't forget to rate! Thanks!

Relieving Fuel System Pressure

Locate the fuel pump relay in the engine compartment fuse block at location K4/C-1051. Remove the fuel pump relay. Start the engine and allow it to idle until it stalls. Crank the engine for 5 seconds to ensure fuel supply manifold pressure is released. When vehicle service is complete, reinstall the fuel pump relay and turn the ignition on to pressurize the fuel system. Start the vehicle and check the system for leaks.
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Jul 08, 2011 | 2005 Ford Freestar

1 Answer

Looking for shut off swicth for 1993 mercury topaz for fuel pump


Fuel Injected Engines

If the vehicle is equipped with a pressure relief valve, install an EFI/CFI fuel pressure gauge T80L9974B or equivalent and depressurize the fuel system. If the vehicle is not equipped with a pressure relief valve, the fuel filter connection should be covered with a shop rag or towel to prevent the fuel from spraying during the removal procedure. It is also possible to reduce the amount of pressure in the fuel system by locating the inertia switch (usually located in the luggage compartment) and disconnecting the electrical connection on the inertia switch. Next crank the engine for 15 seconds to reduce the system pressure

Nov 01, 2010 | 1993 Mercury Topaz

1 Answer

REPLACEING FUEL FILTER


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

I need to change my fuel filter on my '95 GMC sierra 1500, is there a relief valve to let pressure off the line?


There is a schrader valve on the fuel line on the engine for attaching a fuel gauge to monitor the fuel pump for testing purposes, and it should have a cap on the valve similar to a valve stem cap on a tire. (relieving the fuel pressure is similar to letting the air out of a tire and watch out for any fuel spray) or you can loosen up a line fitting at the fuel filter until the pressure bleeds off then replace the fuel filter, and you might want to have a pan to catch the fuel in, and be very certain that there is no ignition source anywhere near the vehicle.

Aug 17, 2010 | 1995 GMC Sierra C1500

1 Answer

Po171 code keeps coming up, I changed the fuel filter. Pressure at fuel filter is 45, pressure at fuel rail is 45. Pressure is 50 with pressure relief valve disabled. Diaphram is good at pressure...


did you check the o2 sensor bank 1 ? cause de p0171 code say sistem too lean bank 1 do you need replace this sensor and get a better fuel saving . or maybe is disconected or the o2 sensor wires could by cut o burn, i think about you problem is not the fuel sistem . clean again carefully the maf sensor without broke the tiny couple wires thks

Aug 07, 2010 | Ford F-250 Cars & Trucks

1 Answer

How do you change a fuel filer on a 1997 olds achieva


FIRST OF ALL RELIEVE THE FUEL SYSTEM PRESSURE.RAISE AND SAFELY SUPPORT THE VECHICLE ON JACK STANDS.USING A BACKUP WRENCH REMOVE THE FUEL LINE FITTINGS FROM THE FUEL FILTER.FOR THE LINE DISCONNECT SIDE OF FUEL FILTER. SQUEEZE BOTH TAB IN. SO YOU CAN REMOVE FUEL LINE FROM FUEL FILTER.REMOVE THE FUEL FILTER MOUNTING SCREWS AND REMOVE THE FILTER FROM THE VECHICLE.REPLACE THE O RING WITH A NEW ONE LUBRICATE O RING WITH A LITTLE ENGINE OIL.TIGHTEN FUEL LINE TO FILTER CONNECTORS 22 FT LBS. THE 2.3L ENGINE RELIEF FUEL PRESSURE LOOSEN FILLER CAP.REMOVE FUEL PUMP FUSE LET ENGINE IDLE UNTIL IT DIES FROM LACK OF FUEL.THE 3.3L ENGINE RELIEF FUEL PRESSURE BY INSTALLING FUEL PRESSURE GAUGE TO THE FUEL PRESSURE TEST PORT WHICH IS THE SCHRAEDER VALVE WITH CAP.ITS ON THE FUEL PRESSURE REGULATOR ASSEMBLY.USE A SHOP TOWEL AROUND CONNECTION TO CATCH FUEL SPRAY.YOU CAN USE A SMALL TINY SCREW DRIVER AT PORT ALSO BUT COVER IT WITH TOWEL TO CATCH FUEL SPRAY.WARNING GO TO DEALERSHIP TO BUY O- RING THAT GOES ON THE FUEL LINE TO FUEL FILTER.IT LOOKS TAN.TAKE THE OLD O-RING TO GET THE CORRECT SIZE O- RING TO FUEL LINE TO FILTER.DONT USE ANY KIND O - RING GASOLINE WILL DISSOLVE IT YOU WILL HAVE A MASSIVE GAS LEAK.WHEN YOU FINISH PUTTING NEW FUEL FILTER IN PLACE ALL FUEL LINES CONNECTED.MAKE SURE WHEN YOU INSTALL NEW FUEL FILTER YOU HEAR OR FEEL THE DISCONNECT SNAP IN PLACE ON THE FUEL FILTER.PULL IT A LITTLE MAKE SURE ITS IN PLACE.WHEN ALL FINISH AND DONE.TURN IGNITION SWITCH ON POSITION ENGINE OFF 3 SECONDS CHECK FOR LEAKS.IF YOU GET LEAK FUEL LINE O - RING LEAKING BECAUSE TOO BIG TOO LOOSE OVER TIGHTEN DAMAGE O - RING.

Mar 09, 2010 | 1997 Oldsmobile Achieva

1 Answer

Is it easy to replace fuel filter?


Fuel Filters are very simple to change. Changing the filter will probably eliminate a suspect in a rough idle, but may not fix the rough idle. The filter is under the driver's side, next to the frame rail on the inside. You will need some shop rags, a pair of pliers, an adjustable crescent wrench, or a wrench set (I can't remember the exact size) and a plan to bleed off the fuel pressure, unless of course you enjoy spraying your self with fuel.

Disconnect the battery and relieve the fuel pressure. Under the hood there is a pressure releif valve (it's a schrader valve, similar to a valve stem on a tire). You can get a kit at parts store that will capture the fluid or you can use the shop rags and hold them over the valve while you depress the pin. Honestly, I would get the kit. After my last experience changing my filter I wouldn't go any other way.

Once you have relieved the fuel pressure, crawl under the truck and change the filter by loosening the nut on the tank side and with the pliers pinching the release tabs on the the motor side of the filter and remove the filter. Have a couple of shop rags and or a small pan to catch the residual fluid that will drain out of the lines.

Install the new filter and make sure your connections are tight, then make sure all the gas is cleaned up from both under the vehicle and under the hood (if needed spray degreaser and hose off. You don't want gas puddled somewhere in the engine bay.) Make sure your pressure relief kit is removed and the cap covering the relief valve replaced. Reconnect the battery and turn on the key. Let the pump run (the whine you hear when you first turn the key) till it shuts off to build up a little bit pressure then crank the motor to start the truck. The truck will take longer to start than normal as you have emptied the gas lines and so it will take a few cranks to get the truck started. But once the truck is started, make sure there are no leaks in the fuel system. Don't stick your head under the truck in case the you accidently didn't tighten something properly and the minute you stick your head under there it decides to come apart. Just look without sticking your head under the vehicle.

Feb 18, 2010 | 2002 Chevrolet S-10

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