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I need the name of the small circular object at the end of my fuel rail

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That is most likely the fuel pressure regulator.

Posted on Apr 17, 2009

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Does it have a fuel warning light??


It sounds like the float for the fuel gauge is probably damaged, bent or missing. It's part of the fuel pump assembly. You can try pulling the fuel pump out and inspecting the float, it will be a small square plastic object on the end of a long metal arm. Check the float itself for damage, and make sure the float arm moves freely. The other end of that arm will have an electrical contact that should be in contact with a semi-circular contact on the pump housing, usually on the inside. Make sure it's contacting that, and if those contacts look corroded, take a clean pencil eraser and rub it on the contact, just as if you were erasing a mistake. If all that checks out and the fuel gauge still isn't working, you'll need to replace it. Check to see if you can get just the gauge itself, but you'll probably have to purchase the fuel pump kit.

Jul 16, 2013 | 1996 Mazda Familia

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FPR - Fuel Pressure Regulator


<p><b><span>2.1) <span> </span><u>FPR - Fuel Pressure Regulator </u>(actuator/passive)<u></u></span></b><br /> <p><b><u><span><span> </span></span></u></b><br /> <p><b><span>What is it?</span></b><span><span> </span>The fuel pressure regulator is a mechanical device that maintains a well regulated level of pressure in the fuel rail to the fuel injectors. <span> </span></span><br /> <p><span> </span><br /> <p><b><span>Where is it located?</span></b><span><span> </span>The FPR is a metal circular device most usually located on the end of the fuel rail on the engine. Attached to its top is a vacuum line from the intake plenum. </span><br /> <p><span> </span><br /> <p><b><span>How does it work?</span></b><span> The fuel pump(s) supply fuel at high pressure to the fuel rail. Excess fuel pressure, above that required for satisfactory injector operation, is released by the FPR by allowing fuel to return to the tank via the fuel return pipe.<span> </span>The FPR consists of a diaphragm valve held closed by the constant force exerted by a spring.<span> </span>Once the pressure of the fuel in the fuel rail exceeds the force of the spring on the valve then fuel bleeds past into the return pipe.<span> </span>The action of the spring is opposed by the effect of a vacuum line (from the intake manifold) acting on the diaphragm.<span> </span><b><i>When the car is at idle the high vacuum conveyed in the line from the inlet manifold to the FPR ensures that only a modest pressure of fuel is allowed in the fuel rail to the injectors.<span> </span>As the engine speed increases there is reduction in vacuum, the spring action is less impeded and the fuel pressure increases.<span> </span>By governing the period of each injection cycle at a given fuel pressure the ECU is able to maintain appropriate and economical use of fuel in response to engine demand</i></b>.</span><br /> <p><b><u><span><span> </span></span></u></b><br /> <p><b><u><span>Symptoms of faulty FPR </span></u></b><br /> <p><b><u><span><span> </span></span></u></b><br /> <p><span>A faulty FPR has many similar effects to that of a faulty MAF namely:-</span><br /> <p><span> </span><br /> <ul> <li><b><span>Rough running</span></b><span> - if the diaphragm is inoperative or the vacuum line has a minor leak the fuel pressure in the fuel rail will be increased.<span> </span>The amount of fuel injected per cycle will be poorly regulated and this will make the engine 'lumpy' due to too rich mix.<span> </span>If the vacuum line to the FPR has a major leak or has become disconnected then the introduction of unmetered air into the inlet plenum will cause bad idling due to too lean mix.</span></li> <li><b><span>Difficulty in starting</span></b><span> - there are two effects here: </span></li> <ul> <li><span>1) If, as above, the effect of the vacuum line to the FPR has a small leak then the engine will run rich to the extent that excess fuel may flood the engine.<span> </span></span></li> <li><span>2) Fuel may exit a faulty FPR diaphragm via the vacuum line and enter the intake manifold again either flooding the engine or making it too rich to ignite.<span> </span>In this circumstance the opening of the throttle fully by pressing hard on the accelerator pedal may result in the engine firing as more air is introduced creating a better mixture ratio. </span></li> </ul> <li><b><span>Poor fuel economy - </span></b><span>Rich mixture due to a faulty FPR allowing high pressures in the fuel line will cause excessively high fuel consumption<b></b></span></li> </ul> <p><span><span> </span></span><br /> <p><b><span>How to check?</span></b><span><span> </span>When the engine is at idle, disconnecting the vacuum line to a healthy FPR should result in a temporary surge in engine revs for a few seconds as the immediate loss of vacuum to the FPR causes an immediate build up in fuel pressure. At each injection cycle a little more is injected causing the engine to build up revs.<span> </span>In the next few seconds the gradual ingress of unmetered air into the plenum, also caused by the disconnected vacuum tube, begins to upset the stable idle of the engine. <span> </span>The engine will suffer from rough idle until the vacuum line is reconnected. <span> </span>Most of the injection inputs will be crudely governed by signals received from the MAP sensor and feedback from the oxygen sensor. </span><br /> <p><span> </span><br /> <p><span>A technical check in FPR function is to connect a fuel pressure tester to the fuel rail.<span> </span>There is usually a threaded connection port on the fuel rail consisting of a Schrader type valve; more commonly seen on car tyres.<span> </span>Testing the fuel pressure not only shows whether or not the fuel pressure regulator is capable of maintaining a consistent pressure but it also checks the fuel pumps' capability of providing the necessary pressure. <span> </span>Pressure in the rail should be highest when the throttle is open and lowest at idle.<span> </span>Pressing the pin in the middle of the Schrader valve is a quick way of depressurizing the fuel rail, akin to letting the air out of a tyre. </span><br /> <p><span> </span><br /> <p><b><span>How to Fix?</span></b><span><span> </span>Check for the presence of fuel from the open end of the disconnected vacuum line to help ascertain the health of the FPR diaphragm.<span> </span>If the FPR is faulty it is simple and cheap to replace it.</span><br /> <p><span><br /></span><br /> <p><span><b>NEXT 2.2) ECT - Engine Coolant temperature sensor </b></span><br />

on Jul 22, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

Looking to take a look at the fuel filter on a 1998 Lincoln continental, and I'd like to know where exactly its located and how to remove with what tools required.


Replacing Lincoln Continental fuel filters requires a spring expander tool. The fuel filter and the fuel lines to the injectors are held in with a circular spring housed in the end of the line. The line itself that the spring clamp slides over has a raised part on the line, and when the spring connector is pushed over this section, the clamp expands to go over the raised section and then collapses once more on the other side, holding the two pieces together. The spring expander tool is a small L-shaped expander the fits over the line and when pushed into the spring expands the spring so it will enable the pieces to be separated.
  • Lift the hood and locate the Schrader valve on top of the fuel rail. The fuel rail sits on the injectors. It looks like a bicycle tire valve. Remove the cap and use a small screwdriver or similar tool and press in slightly on the valve stem to release any pressure in the fuel line. It is a good idea to put a rag in front of the valve for the escaping fuel, but there won't be much lost (mostly pressure).
    Raise and support the car on jack stands for safety. The fuel filter is on the driver's side about midway back on the frame rail. Loosen the pinch bolt that holds the filter to the bracket. Insert the fuel line tool onto the metal line with the long end facing the filter. Push the end of the tool into the spring with a little twisting motion, keeping a little pressure on the tool toward the filter. Once the spring is expanded over the tool, rotate the filter a little and pull it away from the line to separate the two. Once the one side is separated, do the same to the other side. Be careful--though there is no longer fuel pressure, the filter is still full of fuel and will pour out if tipped. Pull the filter out of the bracket.
  • Before installing the new filter, make sure that it is oriented properly. There is an arrow on the filter pointing toward the engine that says "flow." Install the filter into the bracket with the arrow pointing forward. Insert the fuel lines with the spring locks one at a time. Push the filter hard enough to hear or see the spring snap into place. Do the other line the same way and then tighten the pinch bolt in the bracket. Cycle the ignition key several times to prime the fuel line and check for leaks.

Jun 27, 2012 | Cars & Trucks

1 Answer

Free_Schematic_Diagram2000 toy tacoma fuel line


Don't have a diagram, but maybe I can help. Do you see the injectors? They are held on by o-rings to the "fuel rail". On a v-6, there would be two fuel rails connected together with piping. The line from your tank goes right into this fuel rail, and with the pump, keeps a steady pressure up to feed the injectors. On one end of the fuel rail is a small circular object with a vacuum line. That is your pressure regulator. It keeps the pressure constant, and the excess fuel goes out the regulator and into your fuel return line, back into the gas tank. The fuel rail would be on top of the intake manifold, bolted down. Hope this helps.

Oct 21, 2011 | Cars & Trucks

1 Answer

How to seat fuel injecters


Assuming the injectors are already installed in the fuel rail, put a little fuel on the injector seals, position the injector rail in front of the holes in the head.
Start from one end of the rail and work the first injector into its hole a little bit, but not all the way. then do the same for the second and third. Work them in a little at a time so the injectors dont come loose from the fuel rail.
Once you get all injectors completely into the holes, rotate each of them back and forth until the injector turns smoothly when you rotate it. Once an injector rotates smoothly its seated correctly. But only rotate them a small amount back and forth.
If the injectors are removed from the fuel rail, do it the same way. Just install them in the fuel rail first, then install the rail/injectors into the cylinder head.

Sep 26, 2011 | 1995 Oldsmobile Cutlass Ciera

2 Answers

I need to access the fuel injectors in my 98 wrangler, but i dont know how to get to them


FIRST NEED TO RELIEF FUEL PRESSURE REMOVE GAS CAP RELIEF GAS PRESSURE IN FUEL TANK.THEN REMOVE FUEL PUMP RELAY THEN START ENGINE UNTIL IT DIES LACK OF FUEL,CRANK ENGINE OVER FEW MORE TIMES MAKE SURE FUEL OUT OF FUEL LINES. THEN YOU NEED TO REMOVE AIR CLEANER CROSS OVER TUBE ABOVE FUEL RAILS. DISCONNECT LINES AT THE ENDS OF THE FUELS RAILS ASSEMBLY. MARK AND DISCONNECT THE FUEL INJECTOR WIRE HARNESS CONNECTORS. REMOVE THE FUEL RAIL RETAINING BOLTS, DISCONNECT THE VACUUM LINE FROM THE FUEL PRESSURE REGULATOR. REMOVE THE FUEL RAIL ASSEMBLY FROM THE ENGINE. IF YOU HAVE AUTOMATIC TRANSMISSION REMOVE THE THROTTLE PRESSURE CABLE AND BRACKET TO REMOVE THE FUEL RAIL ASSEMBLY.TO REMOVE FUEL INJECTORS JUST REMOVE CLIPS THAT RETAIN FUEL INJECTORS IN FUEL RAIL. BESURE GO TO DEALERSHIP BUY NEW FUEL INJECTORS O - RINGS.APPLY A SMALL AMOUNT OF ENGINE OIL TO THE O - RINGS TO AID IN INSTALLATION. TORQUE FUEL RAIL BOLTS TO 100 INCH LBS.

Jun 19, 2011 | 1998 Jeep Wrangler

1 Answer

Where is the fuel filter on a 1999chevy truck?


Hello, my name is Ben. Your fuel filter is under the driver's side of the truck, mounted to the inside of the frame. It's directly under the driver's door. If you get under the truck just under your door and look at the inside of the frame rail you will see the filter. You will see two nuts on the outside which hold a small plastic cradle which holds the actual filter. Make sure to use two wrenches on each end of the filter so as to not break the fittings on the end of the filter. I recommend changing fuel filters every 10,000 miles, even though the book says 30,000. I consider it cheap insurance. Good luck.

May 13, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Leaking gas on top of motor not sure what the part is


check for leak at fuel fittings on injector rail, faulty fuel pressure regulator (small round canister type valve on end of fuel rail, has vacuum line attached to top) leaking o-rings on injectors.

Dec 26, 2009 | 2001 Oldsmobile Alero

1 Answer

Where on the engine is the fuel regulator located. 2000 jeep cherokee


If you mean the fuel pressure regulator, it's on the fuel rail where the top of the fuel injectors are connected to. It's round in shape and has a small vaccum line connected to it, it's usually on the end of the fuel rail.

Aug 12, 2009 | 2000 Jeep Grand Cherokee

2 Answers

Fuel Pressure Regulator


All Fuel Pressure Regulators are usually attached to the Fuel Rail. In any case, they have a return line to the fuel tank. On your engine you may have to remove the pretty "Plastic Cover" that covers the top of the engine to see the fuel rail and the pressure regulator. Look for a "tube" that has fuel injectors going from the bottom of it and into the top of the intake manifold. The fuel pressure regulator is a round looking device attached to the end of the fuel rail with a small fuel line coming out the botttom and a vacuum line attached to the top of it. At least in most cases this is what it will look like.

Aug 18, 2008 | 1990 Buick Century

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