Question about 1990 Mitsubishi Mighty Max

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My 1990 mighty max is leaking gas out of one of the steel lines from the fuel sending unit on top of the gas tank. where can i get a new fuel sending unit or what should i do?

My truck also started to act like it didnt have power and ran weird would this gas leak be the problem?

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  • 37 Answers

Yes it is more than likely the hole problem. haha. but yes it can be fixed . If you can take the tank down one way to fix the leak is to wash it down with soapy water to get rid of any gas fumes, including inside the lines. Check the entire tube for holes on either side ,if the unit is badly rusted its not worth fixing, if not, sand leaking area down with plumbers tape and if you can solder water pipes then simply solder it. re -install unit . However if you cant or would not rather solder it a new one can be purchased at your local parts store in many cases or definately the dealership at the cost of a couple hundred dollars. Personally, I solder many of these as well as fuel tanks at less than a fourth the cost. Make sure you blow compressed air through the liner on the unit and filter sack to get rid of unwanted water.

Posted on Apr 18, 2013

  • cody Apr 18, 2013

    I have the tank already off thats how i know there is a hole in it. im pretty sure the hole is on one of the lines itself or where it goes threw the fuel sending unit. so i can soder on the tank and fuel line? also i have been looking for the past two hours for a fuel sending unit and haven't been able to find the right one yet.



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Posted on Jan 02, 2017

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SOURCE: wheres the fuel filter on my 1987 mitsubishi mighty max

Hi Paulvilla13,

I'm not sure if your '87 is the same as my '88 or not, but mine is located just in front of the tank. I also have to remove the rear driver-side wheel to get at it.

Hope I've helped, don't forget to rate.


Posted on Feb 24, 2009

  • 523 Answers

SOURCE: I have a 1987 mighty max truck that has been

I expect the carb has become heavily fouled, old gas will quickly gum things up. I'd drain the tank, add new fuel and rebuild the carb. Also insure you have fuel to the carb (possible failed fuel pump)

If I may help further, please let me know,

Posted on Apr 17, 2010

  • 2309 Answers

SOURCE: 1991 Mitsubishi Mighty Max 2D 4X4 V6 3.0L No Start.

you can get pressure specs from your local parts dept, and check injector signal with a noid light

Posted on Apr 23, 2010

  • 523 Answers

SOURCE: No Fuel??? Not starting.

You have fuel flow but the question now is are the injectors pulsing. Given the year of the truck my gut says your ECU, Engine Control Unit, has failed. Mitsubishi had issues with the capacitors in their early 90's cars, trucks SUVs. I have been thru this with two monteros and one 3000GT, very common. To check your injectors rent a set of NOID lites from Autozone our such. Remove an injector plug and itstall a noid light. Turn the engine over, if no flash, no pulse. Remove the ECU and carefully open it up. Look for the capacitors, there should be 3, look under the capacitors on the board; if there is a grease like substance, often time it has a green hew to it, then the capacitor(s) have failed. It may be possible to replace the capacitors or simply purchase a rebuilt ECU. Be ceratin the MD number matches on the new unit.
Please let me know your results and if this had assisted you.
Thanks, Tom

Posted on Apr 25, 2010

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  • 2 Answers

SOURCE: I can't find the fuel filter on my pickup truck

Here's what has to say; In front of the fuel tank. You will likely have to remove the rear driver side wheel to get to it.
On mine it's in front of the rear drivers side wheel and it's tucked in there pretty high. There should be 2 lines going into the top of it.

Posted on May 05, 2010

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