Question about 2000 Pontiac Montana

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Fuel gage does not work - 2000 Pontiac Montana

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Typical of GM products like one post on here mentioned the Pump and Fuel Quantity sending unit are located in the top of the fuel tank. Also typical of GMs on this subject is a problem of corrossion of the conncetions for the fuel sending unit in the tank. Because of the cool invironment in the tank, and the temperature changes associated, also because water vapor is present in the wet environment of the tank inside, corrossion is an issue.
I have this same issue with my GMC Sonoma Pick-up. I plan to remove the bed to gain access to the top of the fuel tank. The removal of the bad (in my oppinion) is a better choice (work wise) then dropping the tank all the way out. Next I will undo the large circular plug in the top of the tank. This mounts the pump and sending unit. Once I gain access to the connection to the sending unit I plan to solder them directly after cleaning the corrossion off. I anticipate some safety issues doing this, as you want to keep heat and flames away from the gas tank (obvious explosive reasons for that). If a big safety margin cannot be adhered to I recommend not attempting this, because you won't even need the car if your a kripy criter and dead.
This is a fix I have heard about, and makes the most sense of anything else I've heard tell of.
I checked on a GM dealer replacing the Pump/Sending unit, and they wanted $900. to do it. What I am talking about would cost my time, and the price of solder, and a new seal for the tank top. Probably in the neighborhood of about $12.00, and a day of work.
On your vehicle a tank drop is almost certain, as you have no bed to remove. You would want to drain the fuel, as it weighs around 6-7 lbs per gallon, and you could see that if you have say 20 gallons in there it would weigh about 140 gallons, and you would probably get hurt trying to drop it. I would recommend driving the gas out, keeping a cell phone with you so you aren't walking. Perhaps have a gallon of gas in the vehicle with you, so that when you run out you have enough to get back home. By doing this you minimize how much fuel is in the tank.
There are several things to take loose/off to drop the tank. You have the filling hose, the supply and return lines, and the electrical connections for the sending unit. Then you have the mounting strap nuts to take loose. I recommend having a floor jack under the tank prior to taking it loose. Put an appropriate sized piece of playwood between the tank and jack. Run the jack up just until it makes contact with the tank. When you get everything loose lower the tank slowly so that you can check to make sure everything is trully loose.
I wouldn't recommend you do this if you can't change your own tires when you have a flat, but anyone who can do general automotive things like oil changes, minor tune-ups and the like can handle this. It really is pretty straight forward. Just think about it logically.
If you can't do this yourself, and you aren't prepared to shell out serious cash, than I recommend you follow the posted advice of filling up and reseting your trip odometer, and not putting any more than 200-300 miles between fill ups. I've been doing this with my truck and have not been stranded, although it is always a risk due to a mileage change not seen.

Posted on Sep 12, 2009

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The fuel gage and pump assemebly is in the fuel tank. This is a very costly fix. you should have a trip gage on the dash, reset it when you gas up, head to a station when you get up to 200 miles. I know it sucks to do this, but it is better then paying out around 500.00 bucks to fix it.

Posted on Jul 28, 2009

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Behind the drivers seat under the floor is a big plug box.
Had it replaced At $328 bill $55.00 used part 4 hrs labor$280.00
Could be it or not thats just one of the problems
Had fuel pump replaced at $517.00
NOW AGAIN Calling A tow truck 4TH time in two weeks for no fuel.
I love my van but this is sad!!!

Posted on Sep 08, 2009

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