Question about 2001 Mitsubishi Montero Sport 4WD

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3 gallons of diesel were inadvertently poured into a nearly empty gas tank on a 2001 Mitsubishi Montero Sport (3.0,, 4WD, Auto.). Car ran for about 3 minutes at idle after error; one brief attempt to restart; then no action.. Need to get car running again. Plan to isolate gas line at fuel filter and **** out with pump all fuel in tank. An attempt to go through gas filler tube was unsuccessful - could not reach fuel. How do I get to and remove fuel filter. After this I plan to fill filter and gas tank with 10 gal gas. Will then try to restart with use of starting fluid (ether) through air intake until gas reaches injectors and fires normally. Is this a good plan or do you have better ides?

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  • the_nuts Apr 03, 2011

    Hi jturcotte. Thanks for the quick and precise response to my problem. Unfortunately my limitations are preventing its application. First, I can hear the fuel pump cycling with either the key or using the battery terminal connect/disconnect. Unfortunately I can not identify the return line? from the small picture or the array of lines on my Mitsubishi. For example below the steering shaft and bolted to the frame rail is what appears to be a 3-port fuel line organizer. One of these line runs up and across the top of the engine (across the air intake manifold) and connects to a black plastic-like connector with 2 ports. The rubber hose on this line has no clamps on it of any kind but is simply slipped over the metal tubing. Breaking this line and running the fuel pump produced no discharge. The second line from the 3-organizer comes across the front of the engine, under the spark plugs and enters the injector manifold? at mid engine. This line has pressure fittings on all ends and I assumed that it probably was the intake line as i could not easily break it anyplace. The third line leaves the engine not far from where the second line enters. This line has hose clamps on the tubing to hose connections. I guessed this might be the return line, but when breaking this line and running the fuel pump, it did not produce any discharge. However when I did turn the engine over some amount of fuel was discharged from this break.
    Sorry to be so stupid. Maybe you could dirrect me to a better picture of my engine which clearly shows the position of the return line and relay. Thanks..

  • the_nuts Apr 04, 2011

    thanks for the details. Glad to hear I was on the right track with the fuel lines. Regarding your questions: I could hear what sounded like a fuel pump running (series of clicks) when the ignition was in the run (not start) position. Unfortunately nothing came out of any of the lines I was testing, even with the fuel pump running. After a short time the clicking stopped which I assumed the relay to be cutting in. If I turned the key off and then on again, the clicking started again with the same duration and results. Unfortunately it is now night/dark here and we are forecast to have tornadoes in the area. I will have to work on this tomorrow, providing the Montero has not blown away. I will start with the relay jumpers, but given I was getting no fuel flow from the return line, I am not optimistic. In the meantime, I recognize your time and effort and I will accept your solution when you send me any reply - even a goodbye.

  • the_nuts Apr 04, 2011

    responsive and quick solutions for each comment. would use this expert again and again. thanks.

  • the_nuts Apr 06, 2011

    Dear jturcotte: I did survive the tornadoes. However after much time trying to figure out your diagram for the fuel pump relay, I was informed that the relay is not in the engine compartment but rather behind the kick panel on the passenger side floor (inside the cabin). Removing the cover did reveal a couple of relays. The first one I came to did me the description I now have for the fuel pump relay. (3 black and white wires and one red and white wire. Labels in the relay are COM, OT ON, and two reading COIL. I jumped the OT ON and COIL wire, and then turned the key on. A few drops of fuel came out the return fuel line, but then no more. So I am now back were I started - with diesel in the gas engine. Any new suggestions?

  • the_nuts Apr 06, 2011

    Sorry it took so long for me to get back to you but I have a course on auto body repair ( can you believe it?) from 8 am to 2 pm daily. Now the relay. I read it wrong. Inside the relay are 4 pins reading N.O, COM. and 2 reading COIL. With the relay removed I tried jumping the N.O. with both of the COIL receptacles. Turning the key produced only a small squirt of fuel from the return line then nothing when I turned the key. I DID NOT try any other combination of jumpers such as N.O. - COM and COM - COIL for fear of causing a short. Maybe this fear is unfounded and I should try one or both of these jumper combinations before I try the solutions with the high pressure line, as you discussed in your last paragraph to me. What are your thoughts and which jumper should I try first? Thanks.

  • the_nuts Apr 08, 2011

    Hard to believe but i finally got the car running. I made up a jumper wire with similar connectors as the relay. I jumped across the COM and the OT terminals, ignoring the COIL. Turning the car key to run position finally produced a trickle out of the return gas line. You would think the fuel pump had a prostrate problem. 3 hours later it had managed to pump out 4 gallons of fuel from the gas tank when it ran dry. This was after running the battery dead in mid stream and requiring a charge. At this point I turned off the key but left everything in place. I then added 5 gallons of gas to the tank and restarted the fuel pump with the key. 20 minutes later after the pump had delivered an additional quarts from the fuel tank, I shut everything down and re hooked up the return fuel line, replaced the relay, etc. My thoughts were to run additional "pure" gas through the system to additionally dilute/clean out any remaining diesel in the system. At this point I tried to start the car as normal, and low and behold, it started immediately. The first 2 minutes of running produced significant white exhaust smoke, but afterwards, normal operation. On a 10 mile immediate drive the engine quit at the first 3 stop signs, but immediately restarted. Since that time, all is OK.
    Thanks for your help, I really appreciated the continued support. By the way, I am not sure you would want to hire me when I finish my auto body repair course, as I am older than you. Having worked as a environmental/civil engineer for 40+ years, I retired and now am running a small classic car restoration business. My two man shop specializes in "top of the line autos", especially TBirds, Continentals, Imperials, and Cadillacs of the 50's and 60s.
    Best Regards, Larry

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  • Mitsubishi Master
  • 8,273 Answers

Hi, you're going to want to purge the system from the fuel rail. This is most easily done by removing the fuel return line from the tank or from the fuel pressure regulator and adding a hose there to guide the fuel into a container. Then you can run the fuel pump and the fuel will pass thru the system all the way around the fuel rail and out the return port of the regulator. If the pump does not stay on, you can either cycle the key or jump the relay (connect terminals 1 and 3 of the relay socket) to keep it running. Once you have done this, the only diesel fuel remaining is the syste, is a thimbleful at each injector manifold port. This will pass thru after cranking the engine for a few minutes. You might want to hold the throttle wide open while cranking. Please let me know if you have any questions, and thanks for using FixYa.

3 gallons of diesel were inadvertently poured into - jturcotte_1448.gif

jturcotte_1449.gif

Posted on Apr 03, 2011

  • 4 more comments 
  • Jeff Turcotte
    Jeff Turcotte Apr 04, 2011

    Sorry that pic was so small, but you're not stupid at all. You got it exactly right. The first one was the evap purge line--only vapor in that one. That second one was the high pressure line to the fuel rail. That one may be too difficult to get loose. The third was the return line, though I'm surprised it didn't blow more fuel out when the pump was running. Did the pump shut off when you let the key off of the start position? If that is happening, you will need to jumper those terminals in the pump relay socket. Is there a fuse or relay box in the engine compartment? Were you having trouble finding the relay?

  • Jeff Turcotte
    Jeff Turcotte Apr 04, 2011

    Fuel pump relay should be here:


  • Jeff Turcotte
    Jeff Turcotte Apr 04, 2011

    The pump should make more of a humming rather than a clicking sound. My guess is it was only priming but not running. With the pump running, there should be fuel coming out. I think it ran when you had the key in start, and it should run continously with a jumper wire in the relay socket.
    Don't worry about my time, I'm here to help until the job is done. I don't actually do this for the money. Let's get your truck running again.
    Now be safe and go to the basement...your Montero will survive the weather.

  • Jeff Turcotte
    Jeff Turcotte Apr 06, 2011

    Hi, glad you survived. Also sorry about the misinformation--my manual must be wrong. Let's get this fixed. Did the pump come on when you jumped the relay? If not, did you try other combination of juming the wires? If the pump IS coming on but nothing's coming out the return, then we'll need to take the regulator off to get the diesel out. If you go to where that line connects at the engine, that's the regulator. It is held on by 2 bolts. Remove those bolts and pull the regulator off the fuel rail. It has an o-ring seal on the end. Be careful as you pull it off as there may be fuel pressuse in the rail. Use a rag over it when you pull it out to avoid the fuel getting on you. Once the regulator is off, the pump should be able to pump the fuel out rapidly. Unfortunately, the fuel will spill out all over the engine unless you can hold a hose up to the fuel rail and drain it into a bucket or other container. You will need an assistant to turn the key on while you hold the hose to the fuel rail. If you can find a hose that fits snugly inside the rail, that might make it easier. Maybe that vacuum hose that's slipped onto the regulator would work. If it fits snug inside, take the other end off the intake manifold and guide it into a container. Your container will need to be several gallons in size. Once you have a hose in there, have someone turn the key on while you hold it in. You'll need to hold it in, or it may push out and spill the fuel. Have the assistant ready to shut off the key in case that happens.
    Now, what it you can't get the regulator off? Maybe it's too hard to get to. In that case, we will not be able to fully drain the diesel from the fuel rail, but we can get it out of the tank and line this way: disconnect the high pressure fuel line at the fuel rail by pushing the quick disconnect tabs in and pulling the line off/apart. Again, this will squirt fuel, so use a rag. Once you have it loose, guide the hose into your container and have your assistant turn the key on. Please let me know if this isn't clear or if you get stuck again. Sorry this is such an ordeal.

  • Jeff Turcotte
    Jeff Turcotte Apr 06, 2011

    OK, we are not going to use the coil, so jump the other other 2 wires together--that should turn the pump on. I think one of the coil wires is connected to the COM, so you might have had it on before. We'll see. And maybe when you're finished with body school I can hire you to do some work for me. I'm no good at body work.

  • Jeff Turcotte
    Jeff Turcotte Apr 08, 2011

    Cool beans! Well, I never said it would come out fast now did I. The regulator serves as an oversized prostate. 4 hours does seem a bit long, though. Yes, you did right by repriming with gas--I should have told you that. Congrats on your retirement. I recently retired from the USAF after 30 years as a mechanical engineer. And anybody would be better at body work than me. It's a great idea to open up a little shop. I've been doing a lot of volunteer work and that kind of thing on the side. Alas, my retirement pay is not enough to live on, so I have to start another job soon.

    It's nice to have the freedom to do what you like. Enjoy life!!

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