Leak coming from fuel injector

I see a leak coming from the fuel injector.
Experienced mechanics share their insights in answering this question :
Hello. If you see a leak in a fuel injector the car should not be driven until repaired since fuel is flammable. Along with replacing the fuel injector, all of the O-rings on the other injectors should be replaced to avoid any further leaks from being disturbed.

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Fuel Injector Problems

Leaks are generally caused by an o-ring failure between the injectors and fuel rails. Engine heat can make the o-rings brittle and crack them, which then causes the fuel injector leak.

Leaking fuel injectors can cause Oil Thinning

If an intake valve is in the open position that fuel will enter the cylinder where it will leak past the rings and eventually mix with the engine oil. Oil thinning can lead to engine bearing damage and scorched cylinder side walls.

Common Symptoms and Causes of Fuel Injector Seal Failure

These symptoms may include a rough idle or misfire, reduced power or acceleration, poor fuel economy, increased emissions, a fuel smell or smoke coming from the exhaust, and a fuel leak under the hood or on the ground.

There are many reasons for faulty fuel injectors but the three most common issues are clogging in your car`s fuel injectors, leaky and dirty injectors. You should remove the fuel injectors and clean them up before putting them back in for your car to function optimally.
One of the first symptoms of a problematic fuel injector o ring is a fuel smell. If the fuel injector o rings dry up or crack, they may leak fuel vapors that will cause a fuel smell from the engine bay. The smell will eventually get stronger as the leak grows larger.
If you have one or more faulty fuel injectors — due to wear or mechanical or electrical issues, driving for a long time can cause several problems: Stalling or failure for your car to start. Flooding of your engine. Pre-ignition of your fuel.
Common causes of injector failure

While many things can cause breakdowns, the most likely cause of premature failure is fuel contamination. Fuel contamination occurs when debris in the fuel gets past the filtration, destroying the sealing surfaces. Think microns, smaller than a human`s hair-sized, clearances.

The Engine Misfires

Dirty fuel injectors may cause your vehicle`s engine to misfire. This problem makes the motor feel as though it is sputtering — sending vibrations through the car. Such misfires can happen when a fuel injector problem mixes up the delicate balance between fuel and air entering the engine.

The customer can look out for a deeper, gravely engine sound, engine chugging, the whole vehicle might have a slight shake or vibration.
One of the first symptoms of a problematic fuel injector o ring is a fuel smell. If the fuel injector o rings dry up or crack, they may leak fuel vapors that will cause a fuel smell from the engine bay. The smell will eventually get stronger as the leak grows larger.
Common causes of injector failure

While many things can cause breakdowns, the most likely cause of premature failure is fuel contamination. Fuel contamination occurs when debris in the fuel gets past the filtration, destroying the sealing surfaces. Think microns, smaller than a human`s hair-sized, clearances.

Common causes of injector failure

While many things can cause breakdowns, the most likely cause of premature failure is fuel contamination. Fuel contamination occurs when debris in the fuel gets past the filtration, destroying the sealing surfaces. Think microns, smaller than a human`s hair-sized, clearances.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

I have a 1981 e-350 with dual fuel tanks the p.o. added a third tank and 3 electric fuel pumps along with sepparate gauges and swi
ANSWER : The switch you are referring to is vended with the required electrical and fuel schematic (I just looked in the box) that answers your installation question. If you want an advance view, here is a link as well. Yes, you need a return line and just refer to the aforementioned link. If you are retrofitting back to OEM, I strongly encourage you to buy the original Factory Service Manual (FSM). There are lots of details attending this system and obviously it is difficult to recount it all here. The FSM will make your life much easier and you can then make sure your installation is perfect. Alternatively, YourMechanic can dispatch a certified mechanic and perform the whole retrofit and check out if you desire. Just request and schedule a generic service such as fuel pump service and the mechanic will come to your location and estimate the parts and labor required. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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Why does my injector keep leaking?
ANSWER : Hello. If the rubber O-ring keeps burning off then it may be possible that the engine is running too hot. I would check to see if any heat shields or similar components are out of place, or if the engine is running hotter than normal. I would also make sure that the seals and o-rings you are using are quality components and are the correct type. If the incorrect o-rings are used, that may be why they are having issues. It may also be possible that the injector itself is faulty and needs to be replaced. If you need to have this looked at, a certified professional from YourMechanic can come to your home or office to diagnose the leak and assist with repairs.

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Just replaced my fuel pump but its not getting any power tested fuel pump relay and fuel fuse both good tested the wires all good.
ANSWER : You need to look at the theft light on dash to make sure it comes on and goes off when you turn the key to the on position. If light comes on and stays on then your theft system is causing the fuel pump to not be engaged. I recommend you check the theft system and then scan the computer for theft system codes. You may need to reprogram the keys to work or you have an bad sensor for the ignition key in the steering column.

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Rough idle and there is a raw fuel smell coming from the exhaust.
ANSWER : If the spark plugs were replaced and there is too much fuel in the exhaust system, then the injectors are leaking and not spraying (atomizing) the fuel properly. A leaking fuel o-ring will make the fuel puddle up outside of the injector and give a fuel smell under the hood. I recommend flushing the fuel system with a fuel injection cleaner. If you need further assistance with your engine idle being rough, then seek out a professional, such as one from Your Mechanic, to help you.

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Fuel EVAP line that runs under car is kinked how do I know if it is leaking? Also can I drive it like that if it’s not leaking?
ANSWER : Hi Ricardo. We answered your question earlier. However, if you didn’t receive the reply, here is what we stated earlier. In most cases, an EVAP leak will create an OBD-II trouble code. The best way to detect an EVAP leak is by having a professional mobile mechanic complete a check engine light inspection, they will be able to download the code and determine the source of the leak. That’s the best advice we can offer you. Thanks.

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How long and what is the process to replace a fuel pressure sensor?
ANSWER : A professional mechanic would require roughly 5 hours. (If just the regulator is replaced that takes about 1 hour). Some parts, as noted below, cannot be re-used, you need a precision inch pound torque wrench, FSM instructions (and TSB updates if applicable; procedure was changed in 2007 for instance) and the system has to be bled when done.

Below is partial list of steps, copied and pasted directly from the service manual:

1. Disconnect battery and put protective material in front of the charge air cooler (CAC) or damage to the CAC may occur.

2. Remove air cleaner assembly.

3. Disconnect the oil drain tube from the crankcase vent oil separator.

4. Loosen the air cleaner outlet tube clamp and detach the air cleaner outlet tube from the turbocharger.

5. Remove the bolts, the crankcase vent oil separator and the air cleaner outlet pipe as an assembly.

6. Remove and discard the crankcase vent oil separator press-in-place gasket. (To re-install, tighten to 13 Nm (115 lb-in).

7. Disconnect the PCM electrical connector (BE SURE BATTERY IS DISCONNECTED FIRST!) and retainer. Disconnect the in-line electrical connector and position the engine wiring harness on the engine.

8. Remove the pushnuts and the glow plug module heat shield.

9. Disconnect the high-pressure fuel injection pump electrical connector and detach the retainer from the glow plug module bracket. Disconnect the glow plug module and the exhaust gas recirculation temperature (EGRT) sensor electrical connectors, detach the wiring retainer and position the wiring harnesses aside.

10. Remove the nut and position the ground strap aside. To install, tighten to 13 Nm (115 lb-in).

11. Remove the engine wiring harness bolt. To install, tighten to 13 Nm (115 lb-in).

12. Remove the heater supply tube nut. To install, tighten to 13 Nm (115 lb-in).

13. Remove the bolts and the glow plug module bracket. To install, tighten to 13 Nm (115 lb-in).

14. Remove the nut and position the transmission fluid indicator tube aside. To install, tighten to 8 Nm (71 lb-in).

Warning: Do NOT disconnect the glow plug electrical connector before dislodging the seal from the valve cover or the wiring harness may be damaged.

15. Using an appropriate tool, dislodge the glow plug wiring harness seals from the valve cover.

16. Disconnect the glow plug electrical connectors by pulling on the glow plug wiring harness tee above the seal. Remove the glow plug wiring harness.

17. Remove the nut and position the crankcase ventilation drain tube aside.

18. Disconnect the wiring harness retainer from the valve cover stud.

19. Disconnect the wiring harness retainer from the generator bracket.

20. Disconnect the A/C pressure switch electrical connector. Position the harness aside.

Warning: Do not bend or flex the heater supply tube or damage to the tube may occur.

21. Remove the stud bolts, bolts and the valve cover. Remove and discard the valve cover gasket. To install, tighten to 9 Nm (80 lb-in).

Warning: Contact with exposed fuel injector wiring, if energized, may result in electric shock.

Use care when working on or around energized fuel injector wiring. Fuel injector wiring supplies HIGH VOLTAGE to operate the fuel injectors of course, you disconnected the battery though.

22. Disconnect the fuel rail pressure (FRP) sensor electrical connector.

Warning: Fuel injection equipment is manufactured to VERY precise tolerances and fine clearances (think space shuttle). To prevent fuel system damage, it is essential that absolute cleanliness is observed when working with these components. Always install fuel system caps on any open orifices or tubes.

23. Remove the FRP sensor. To install, tighten the FRP sensor in 2 stages.

Stage 1: Tighten to 7 Nm (62 lb-in).
Stage 2: Tighten an additional 40 degrees.

24. Bleed the high-pressure fuel system.

If you feel like this job may be too overwhelming or run into any issues, consider YourMechanic to get it done. One of our mobile technicians can come to your home and replace the fuel pressure sensor at your own convenience.

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i have a 98 lincoln mark8 v8 and apparently it has an oil leak. now i dont know where the leak is coming from but i was told it co
ANSWER : Hi there. The first thing that any mechanic would do is determine where the oil leak is coming from before quoting you a maximum price estimate. In general, most oil leaks are caused by front crankshaft seals that become worn out, especially on vehicles that are nearly 20 years old. This type of replacement could cost up to $800 to $1,200 depending on what else might be damaged. You might want to have a professional mechanic come to your location to complete a car is leaking oil inspection, so they can pinpoint the source and recommend repairs.

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Fuel pressure
ANSWER : Hello,
You may want to try checking the fuel pump relay. The relay wires should have ground on two wires, power on one wire and switched power on another wire. To activate the fuel pump your ECU actually connects one of the ground wires to complete the circuit and send power to the fuel pump. If the wires all have power running through them, then it is likely you have a faulty relay. The wire coming from the fuel pump is the other ground wire. I would recommend having an expert from YourMechanic come to your location to diagnose your wiring as this can be very difficult and time consuming without the proper wiring diagram.

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