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U62T Fuel Pump Question

Discussion in 'Mitsubishi Minicab' started by mdjackson, Dec 1, 2015.

  1. mdjackson

    mdjackson New Member

    I've got a 2002 U62T that I think . . . . the fuel pump has gone out. Would anyone who's got one, tell me if when you first turn the ignition on, can you hear the pump run? Mine used to do that, and now it's not and it will not crank. I don't smell fuel anywhere either, and it's 3/4 full.

    Or, could it be the relay?

    I'd appreciate any and all help.
  2. fmartin_gila

    fmartin_gila Active Member

    Check the fuse and relay first. As soon as you turn the key on you should hear the relay click on and should shut off after about 2 seconds to build fuel pump pressure. After the engine starts, the pump should run again to maintain the fuel pressure.

  3. mdjackson

    mdjackson New Member

    Thank you Fred.

    I have checked all of the fuses behind the glove box, with meter, all good. Didn't get a chance to finish checking the fuses under the seat. I've got the complete mechanical book from Danko. Book does not give me a good picture of what the fuel pump relay looks like, makes a reference to disconnect the connector (grey). I see two grey colored connectors where the picture says it should be, need to track down the relay position.

    Does the fuel pump relay appear as a turn signal solenoid?
  4. fmartin_gila

    fmartin_gila Active Member

    On mine (DG62Y) the relays and fuses under the seat are in one box which is hardwired and mounted so the only way to check would be to pull the relay and jumper across from the main feed(after making sure it is hot) to the fuel pump terminal. At least that would eliminate whether the relay is the problem or not. Then leaving the jumper in, you could check out the current path to the pump to determine whether you do get current to the pump. If your Connectors are removable from a solid mounted relay, you can still pull the connector and jumper across it and then check out the current path to the pump. Hope this helps a little.

  5. mdjackson

    mdjackson New Member

    Need to get a second set of eyes on the location of the relay. I've got to be looking at it and just not knowing what I'm seeing, compared to the drawing in the book. Really appreciate your instructions above, because it sounds like if the relay is bad, it leaves the circuit open and no voltage to the pump. This maybe my problem, I turned the ignition on and checked to see if I had voltage at the pump, and I did not. I'll take a camera with me and get a picture of the fuse block and electrical connections next, maybe that way someone could help me identify the relay.
  6. fmartin_gila

    fmartin_gila Active Member

    Take note of the wiring color at the fuel pump and see if you can find the same color/s at the relay connectors you are looking at, you may be able to identify the relay that way. You can jumper that connector to see if you have a current path to the pump. You should have the pump connection, a feed from the fuel pump fuse, and a feed from the ignition switch to the energizing coil in the relay. Kind of "process by elimination" as to where you will find the voltage loss point.

  7. mrfixitinoc

    mrfixitinoc New Member

    What a coincidence, I've been troubleshooting a friends' 2000 U62T. What I found was a burnt relay caused by a pump bound up with rust particles that passed thru a torn filter screen. I cant believe they don't have a 'real' fuel filter, just the filter screen (sock style) at the foot of the in-tank pump.
    You are looking in the right place for the relay; there are 2 mounted to the same bracket bolted to firewall above the fuse block. I unbolted the bracket (1 bolt) to better access the connector. The pump wire is BLK/BLU on my vehicle. You can make a jumper with 2 male spade terminals (jumper the 2 heavier gage wires in the connector housing) to see if your pump is fried.
    Good luck! Hopefully your pump is OK. I'm having a tough time sourcing one in the US. The only option I've found so far is a 'kit' (bare pump w/ filter screen) for $300 . . . are they serious!! Anyone have additional sources for a U62T in-tank pump???
  8. fmartin_gila

    fmartin_gila Active Member

    I have not looked up your model vehicle but on mine (DG62Y) the pump is in-tank. Is it possible to remove the pump part and use the rest as a pickup only and then use a frame mounted pump inline with a filter between the tank and pump to feed the fuel to the engine. Sure seems to me that this would be a lot less expensive than that. All my years as a fleet mechanic, the main thing was to keep the units in operation at minimum cost or without wasting money and I have used this method on a few occasions. Sometimes one has to think a bit differently on how to get things done.

  9. mdjackson

    mdjackson New Member

    MrFixItInOc Thanks! For confirming that I'm looking in the right place . . . . I saw those two blocks, connected and above the fuse block. I just thought the black box "ON" the fuse block would be the relay. Which of the two above the fuse block is the relay? Left one or Right / Near the fender or the heater fan? I'm working at home today and will go to farm this afternoon and try to get my big hand up in that little space.

    Fred I'll pick up an inline filter and add that to the mix.

    Took pictures last time out to the farm shed. These pictures are really big, hope that doesn't give anyone a problem with this thread. link to pic.
    What about the corrosion on this plug? Is the relay the black box plugged in?

    Link to image:http://i.imgur.com/KDHUFDT.jpg
    Better view: [​IMG]

    Link to image: http://i.imgur.com/IVO8ZBZ.jpg
    Better view: [​IMG]

    Link to image: http://i.imgur.com/NOEzH7h.jpg
    View from bottom: [​IMG]
  10. mrfixitinoc

    mrfixitinoc New Member

    In your last photo (above), you can see part of the fuel pump relay, it's connector & the same of the relay mounted adjacent (ECU main relay I think) on the same bracket. Look above the ECU (black box behind fuse block) connectors; there are 2 connectors, first one is dark the upper one is light. On the lower one you can even see the BLK/BLU wire which on my U62T goes to the fuel tank. Verify yours is the same. I took a photo of this pair of relays unbolted from firewall showing the connector with jumper installed.
    On the corrosion issue . . . I would pull the connector out see if contacts are corroded. The individual wires/contacts can be removed for cleaning or replacement. If you haven't done this before check with you local parts store, they should have an 'extraction kit' or at least be able to describe how its done. For generic info google 'automotive connector pin extraction'.
  11. mrfixitinoc

    mrfixitinoc New Member

    Thanks for the idea(s). The U62T I'm working on has the in- tank pump/bracket & could be modified; any suggestions where to shop for an external pump that might work? The manual I'm working from (2000 U62T with 3G83 engine, MT, 4WD) specs the fuel pump pressure @ 35-38psi unregulated, 27psi regulated @ fuel rail. The closest thing I found was 45-65psi unregulated with a ridiculous flow rate.
    I did find a lower price for the stock pump kit ($200) but would rather go with the superior external system for the same $ if I can find the right pieces.
  12. fmartin_gila

    fmartin_gila Active Member

    Sorry I can't be more help but I have been retired since 1990 and no longer familiar with what is available from all the newer vehicles and I now live in the Philippines. Find out what type of fuel pump (in-tank or frame mount) and the method of regulating pressure that some different vehicles use and go from there.

  13. mdjackson

    mdjackson New Member

    MrFixItInoc: Thanks for the great picture! Getting that relay bolt out was fun. I worked on the relay yesterday and the jumper trick worked. My fuel pump is dead, got one from FG Procurement and a box of maintenance parts. Part of my problem was I didn't have a really good battery, when I jumped the truck from a tractor battery, I could hear the relay click. I jumpered the relay after checking the wire color, it was the same, and I had power to the pump, it just never worked.

    You're right about those connectors, never saw the corrosion until I'm under there. Another day, another thing to fix.

    Fred: Congratulations on being retired! I'm getting closer by the day, not quite 60 yet, but getting there.

    Thank you both for all of your assistance. There are no Mitsubishi dealers in the state of Mississippi at all, nearest one is in Louisiana (131 miles).
  14. mdjackson

    mdjackson New Member

    Installed the new fuel pump, amazed at all of the rust inside the tank. Guess when they ship these trucks over to the USA they have the tanks dry and they just rust away from condensation.
    Picture of the new pump installed.

    Picture of the rust inside the tank, it's not the best shot, but you can still see the rust in the bottom.

    Charged up the battery and will run it some today while I'm working on a drain to the farm pond.

    Thanks for all your help.
    MD Jackson
  15. Jonathan collett

    Jonathan collett New Member

    Where did you get your in tank fuel pump? I've been looking for a while for one. I have a U15t 89 model.
  16. mdjackson

    mdjackson New Member

    I got mine from G&R in Missouri. Here is their website. https://www.grimports.com/ Call them if you don't see your model listed, they will tell you if it's available in the USA.

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