Question about 1992 Toyota Corolla

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On my toyota twincam 4 A-GE motor the fuel is not been returned to the tank. from the tuel rail. there is a high amount of pressure on the feul rail inlit.what could be the problem?

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With fuel pressure gauge hook up, check reading, then disconnect vacuum hose from fuel pressure regulator, regulator sit on injector fuel rail, fuel pressure should go up, if it don't fuel pressure regulator stuck close, and not letting fuel back into fuel tank, hope this was very helpful.

Posted on Aug 27, 2010

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I need a diagram to show me the routing of the petrol pipes on a citroen c3 from the petrol tank to the engine and back to the petrol tank please?


the fuel is constantly rotating round the fuel lines, the fuel is pressurized, so any fuel that is not used by the injectors is sent back to the tank.. this give a constant flow and pressure to the tank. the pressure in the tank is regulated by the pressure relay that lets air into the tank to lower the pressure. this is regulated by the ecu and your speed. if the pressure drops or is to high in the tank the engine can cut out on the fuel rail there is a fuel pressure regulator this keeps pressure on the fuel line coming into the injection system. some systems have duel line feeds from the tank for 2 rail systems, this system was not reliable due to the amount of feed pressure needed to fuel 2 lines. and can cause pressure leaks. some systems have a pressure regulator controlled by the ecu on the return line, this is more fuel efficient as it keeps the fuel at a steadier flow back to the tank and give a better fuel spray into the engine. hope this help you.

Jul 03, 2017 | Citroen Cars & Trucks

1 Answer

Toyota conquest 16v twincam problems


possible fuel filter fuel pump check the fuel pressure at the fuel rail it should be at 40 psi or more while running at 2000 rpm for two minutes then shut it off watch for leak down on gauge for five minutes it should actually go up not down

May 23, 2013 | Toyota Cars & Trucks

2 Answers

Cranks for a long time to start up when it has sat for a while.suspect fuel pressure not staying in feul rail.do i have to drop tank to replace feul pump? jgsabates@verizon.net


Check the Fuel Pressure at the fuel rail with a gauge first

Before you start replacing a fuel pump make sure
the other systems on your car are working correctly

Spark Plugs
Old Gas Filter
Old Air Filter
Dirty MAF Sensor
Old O2 Sensors
Clogged Exhaust Converter
Vacuum Leaks

Apr 24, 2011 | 2001 Ford Escort ZX2

1 Answer

Put in a fuel pump and fuel filter and now have no pressure in the fuel rail


I dont know the year so it is difficult to be specific.Is there enough feul in the tank for the feul pump to pick up.Some feul filters have the same connections on both sides and can be installed backwards, this will cause a restriction because feul will only flow one direction.Can you open the feul cap and hear feul pump turn on for 3 seconds when the ignition switch is cycled.Let me know if i can help?

Feb 09, 2011 | Cadillac DeVille Cars & Trucks

1 Answer

Fuel Gauge displays 1/4 tank, vehicle does not start, bled the injectors of air, vehicle started , next day same problem occured , it is a skoda octavia 1.9 TDI 2004 Please assist


nice car a skoda ,2004 so its common rail and whats happening is a valve in the pump on the common rail injector where it draws the fuel up is defective and its allowing the fuel to run back to the tank ,quick solution is is to fit a non return valve in the in side and one on the return that will cure your problem and its cheaper than having the high pressure injector pump overhauled

Nov 30, 2010 | Volkswagen Golf Cars & Trucks

1 Answer

I put a new fuel pump in my 97 concorde, it ran just fine all the way home, but in the morning i wouldnt start. i put another pump in and the same thing happend. could this be a short somewhere?


Well, the fuel pump relay may not be getting electricity to the fuel pump.

Also, use the following procedure to test the fuel pump before changing it again:

TESTING Fig. 1: Connect the fuel pressure gauge C4799B or equivalent to the fuel rail service valve - 3.3L shown 88175g09.gif
Fig. 2: Checking the fuel pressure with a gauge - 3.5L shown 88175g10.gif
Fig. 3: Checking the pressure between the pump and the filter 88175g11.gif
Fig. 4: Place the other end of the adapter 6668 into an approved gasoline container 88175g12.gif
  1. Release the fuel system pressure as described in earlier in this section.
  2. Remove the protective cover from the service valve on the fuel rail.
  3. Connect fuel pressure gauge C-4799B or equivalent to the fuel rail service valve.
  4. Place the ignition key in the ON position. Using the DRB III tester or equivalent, access the ASD fuel system test. (The ASD fuel system test will activate the fuel pump and pressurize the system.)
  5. If the gauge reading equals the specifications, then further testing is not required. Without vacuum applied to the regulator, the 3.3L engine fuel system operates at 55 psi (379 kPa). With the engine idling and the manifold vacuum applied to the regulator, the system operates at approximately 46 psi (317 kPa). Without vacuum applied to the regulator, the 3.5L engine fuel system operates at 48 psi (331 kPa). With the engine idling and the manifold vacuum applied to the regulator, the system operates at approximately 39 psi (269 kPa). The fuel system pressure varies with the different amounts of manifold vacuum applied to the regulator. If the pressure is not correct, record the pressure and remove the gauge.
  6. Ensure that the fuel does not leak from the fuel rail service valve. Install the protective cover onto the fuel rail service valve.
  7. If the fuel pressure reading was below the specifications, test the system according to the following procedure:
    1. Perform the fuel pressure release procedure.
    2. Install a fuel gauge C4799 and fuel adapter 6631 or equivalent in the fuel supply line between the tank and the fuel filter.
    3. Using the DRB III scan tool or equivalent, with the ignition key in the ON position, repeat the ASD fuel system test.
  8. If the pressure is at least 5 psi (1 kPa) or higher than the reading recorded, replace the fuel filter.
  9. If no change is observed, gently squeeze the return hose. If the pressure increases, replace the pressure regulator. If the gauge reading does not change when the return hose is squeezed, the problem is either a plugged inlet strainer or defective fuel pump.
  10. If the fuel pressure reading was above the specifications test the system according to the following procedure:
    1. Perform the pressure release procedure.
    2. Install fuel pressure gauge C4799 and adapter 6631 or equivalent in the fuel supply line between the fuel tank and the fuel filter.
    3. Remove the fuel return line hose from the pump at the tank. Connect pressure test adapter 6668 or equivalent to the return line. Place the other end of adapter 6668 into an approved gasoline container. A minimum of 2 gallon tank should be sufficient. All return fuel will flow into the container.
    4. Using the DRB III scan tool or its equivalent, with the ignition key in the ON position, repeat the ASD fuel system test.
  11. If the pressure is now correct, replace the fuel pump.
  12. If the pressure is still above specifications, remove the fuel return hose from the chassis fuel tubes (at the engine) and attach fuel pressure test adapter 6668 or equivalent to the return tube. Place the other end of the hose in the clean container, repeat the test. If the pressure is now correct, check for a restricted fuel return line. If there is no change observed, replace the fuel pressure regulator.
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Oct 08, 2010 | 1997 Chrysler Concorde

3 Answers

Drive 1988 ford f150 on the highway it dies and won,t start back. It acts like it is out of gas. Let it set 30 mins. and it starts right up


Fuel Pump-a possible. The time frame of 30 minutes will vary.
The armature on the pump motor is worn, as well as the tiny bearing,so it seizes or just stops conducting current.
Drop fuel tank and replace. May be able to remove all bed bolts but rear ones, and tip bed up.

Sep 28, 2010 | 1988 Ford F 150

2 Answers

My 1990 chrysler imperial will idle fine but it dies when you give it gas.I changed the fuel pump and both computers and i'm still having the problem.


Sounds as though it may be your fuel pressure regulator. Easy fix and you can troubleshoot it easily also. Check the fuel pressure first. This is your part....

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Fig. 13: Compression gauge and a combination vacuum/fuel pressure test gauge

5bd50f2.jpg
TESTING Except Premier and Monaco NOTE: To perform this test, you will need a pressure gauge capable of reading pressures above 55 psi (379 kPa). The gauge must have a connection that will fit the fuel rail service valve. The gauge must be the equivalent of Chrysler pressure gauge No. C-4799 and the connector fitting compatible with pressure test adapter 6539. You may also need a T and the fittings necessary to connect the gauge into the fuel supply line at the tank, as well as a 2 gallon container suitable for collecting fuel.
  1. Release the fuel system pressure as described in Section 1.
  2. Disconnect and plug the vacuum line going to the fuel pressure regulator.
  3. Remove fuel hose quick connector from the chassis line.
  4. Install the adapter between the fuel supply hose and chassis fuel line assembly for the 3.0L engines or into the service port of the fuel rail for 3.3L and 3.8L engines.
  5. Hold the gauge and have someone start the engine. Run the engine at idle speed in Neutral (manual transaxles) or Park (automatic transaxles). CAUTION
    Exercise extreme caution while under the hood with the engine running. Keep clear of all moving belts, fans, exhaust manifolds, etc.
  6. Read the pressure. It should be 48 psi (330 kPa). If it is outside the range, take note of it.
  7. Stop the engine.
  8. Once again depressurize the system, disconnect the gauge and replace the protective cover.
  9. If the pressure was correct, the test is complete. If the pressure is below the range, proceed with the next step; if it is too high, skip to Step 13. WARNING
    In the next step, note that fuel may drain from the lines as you disconnect them. Make sure all surrounding exhaust system parts are cool and that all sources of ignition are removed from the area. Collect fuel and dispose of it safely.
  10. Connect the gauge into the fuel supply line running between the tank and the filter which is located at the rear of the vehicle. WARNING
    Make sure all connections are secure.
  11. Have an assistant start the engine, then read the pressure gauge. If the pressure has risen more than 5 psi (35 kPa), replace the filter. If the pressure is now within range, allow the engine to cool and remove all sources of ignition; depressurize the system; disconnect the gauge from the lines; replace the fuel filter; and restore all connections.
  12. If the pressure is still too low, gently and gradually pinch the fuel return line closed as you watch the gauge. If the pressure increases, the fuel pressure regulator is at fault. If there is no change, the problem is either clogging of the filter sock mounted on the pump or a defective pump itself.
  13. If the pressure is too high, follow this procedure:
    1. Shut off the engine and allow it to cool.
    2. Depressurize the fuel system, then disconnect the fuel return hose at the chassis, near the fuel tank.
    3. Connect a 3 ft. (91cm) length of hose to the open end of the line running along the chassis. Position the open end of the line into a container suitable for collecting fuel.
    4. Have a helper start the engine, then check the pressure again. If it is now correct, check the in-tank fuel return hose for kinking.
    5. If the in-tank fuel return hose is okay, and the system still exhibits excessive pressure with the tank half full or more, the fuel pump reservoir check valve or aspirator jet may be obstructed and the assembly must be replaced.
  14. If the pressure is still too high, perform the following:
    1. Shut the engine OFF, and allow it to cool.
    2. Depressurize the system once again and reconnect the fuel lines at the rear.
    3. Disconnect the fuel return hose at the pressure regulator. Collect all fuel that drains.
    4. Run the open connection into a large metal container.
    5. Reconnect the fuel gauge to the fuel rail.
    6. Start the engine and repeat the test. If the fuel pressure is now correct, clean a clogged return line or replace pinched or kinked sections of the return line. If no such problems exist, replace the fuel pressure regulator.
Premier and Monaco CAUTION
Wear eye protection when servicing the fuel system. Do not smoke or allow open flame near fuel system components during fuel system service.
  1. Remove the fuel tank filler cap to relieve the fuel tank pressure. NOTE: System fuel pressure will be released when disconnecting the fuel supply tube. Have shop towels handy to absorb spilled fuel.
  2. Use the quick disconnect tool 6182, or equivalent, to remove the black fuel supply tube from the fuel rail. Slide the tool over the nipple and up into the connector until the handle fits the connector. Pull the fuel supply tube off the fuel rail.
  3. Install the fuel tube pressure adapter tool 6175, or equivalent.
  4. Push the female end with the quick-connect fitting over the fuel rail until a click is heard. Pull the connector back to ensure that it is locked in place.
  5. Push the male end with the nipple into the black fuel supply tube until a click is heard. Pull the nipple back to ensure that it is locked in place.
  6. Attach a 0–60 psi (0–415 kPa) gauge from the fuel pressure test kit 5069, or equivalent, to the port on the fuel tube pressure adapter tool.
  7. Start the engine and check the fuel pressure. It should be 28–30 psi (193–207 kPa) for early models and 43 psi (300 kPa) for late models. The fuel pressure regulator on these vehicles is non-adjustable.
  8. If the fuel pressure is low, check for fuel flow through the return tube.
    1. If fuel is returning to the fuel tank through the fuel return tube, replace the fuel pressure regulator with a new one.
    2. If the fuel is not returning to the fuel tank or just trickling out, inspect for a faulty fuel pump, possible clogged fuel filter or other restriction between the fuel pressure regulator and the fuel pump.
  9. If the fuel pressure is high, check the pressure regulator vacuum hose for leaks, and for a kink or restriction in the fuel return hose. If the pressure regulator vacuum hose is not leaking, the return tube is not kinked and does not have a restriction, the fuel pressure regulator should be replaced with a new one.
  10. Remove the pressure gauge.
  11. Disconnect the fuel tube pressure adapter tool with the quick disconnect tool.
  12. Prior to installing the fuel tubes to the regulator and fuel rail the tube ends must be lightly lubricated with clean SAE 30 weight engine oil. Refer to the procedures describing the removal and installation of the fuel tubes.
  13. Install the black fuel supply tube to the fuel rail and the gray fuel return tube to the pressure regulator.
  14. Install the fuel tank filler cap.
  15. Start the vehicle and check for fuel leaks. NOTE: When starting the engine, allow extra time for the system to pressurize itself.

Oct 06, 2009 | 1990 Chrysler Imperial

1 Answer

Gas smell when starting and small dripage when back up from under engine


It sounds like the return fuel line is leaking. There are two fuel line and one is the high pressure line which goes to the fuel pressure regulator then to the fuel rails. There is then a return line from the fuel rail to the gas tank.
With the amount of fuel leak, it's going to be the return line since it's not that bad compared to the high pressure side. Follow the fuel lines from the drivers side around the steering shaft to the engine. The high side and low side (return) run side by side and you should see it leaking when the engine is running.
Good luck and hope this helps.

May 25, 2009 | 1994 Chevrolet Beretta

2 Answers

Won't keep running


Hi

It sounds to me as though you have a case of excessive fuel pressure, which could be due to a faulty fuel pressure regulator or a blocked fuel return line.

I don't know whether or not there is a Schraeder valve on the fuel rail of your car (it looks like a tyre valve) but if there is then it may be worth connecting a fuel pressure gauge to it and observing the fuel pressure build up.

You could also disconnect the fuel return line from the fuel rail, push another length of rubber pipe onto the rail, hold the end in a suitable glass container, and then have someone start the engine whilst you gauge the fuel flow from the pipe. It should be a good steady flow, and, if the engine doesn't cut out with the return line disconnected then you know there is a blockage in the return line and you can make arrangements to blow it through.

Very best regards

Geordie

Jun 07, 2008 | 1987 Toyota Celica

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