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Thread: Rear Underbody Resto/Gas Tank Install

  1. #1
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    Default Rear Underbody Resto/Gas Tank Install

    Well ... the car has been out of commission for over a year now. It wouldn't start one day and I eventually diagnosed a fuel pressure issue. Pulled the tank to find the fuel hose inside of the tank had split and thus not allowing the system to build much/any pressure. In classic "while I'm at it" fashion, I decided to take it further ...

    Once I pulled the tank, I figured it was a good time to address some corrosion on the underside of the car. A little history ... my parents bought the car brand new around Christmas of '84 and pretty much gave it to me when I graduated from high school in '97. It needed some minor stuff at the time, but they gifted it to me versus trading it in on their next vehicle, and I worked on addressing the minor stuff it needed. The "bad" thing in all of this was that we lived in northern lower Michigan at the time ... a place where winter can last months (from October to May one year while we lived there). The car got driven in plenty of foul weather and was exposed to a lot of salty roads. I tried to keep it clean and wash it, but there's only so much you can do when it's below freezing. I undercoated it at least twice, but I knew I was just covering up some of the issue.

    So ... with the tank out, I decided I would scrape and chisel off all of the undercoating (from the rear seats back) and wire wheel any rusty areas I came across to clean them up. I then used the POR-15 three part process to address the rust and re-coat the underside of the car. After all of the wire wheeling, I degreased the underside, rinsed it, then treated it with a metal prep solution that etches the metal and leaves a white residue in the diseased areas. When that's all done, you rinse it all off again and let it dry. These areas aren't horrible, but here's a little of what it looked like before I started the painting process:
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  2. #2
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    Here's a few shots of the progress on the painting. I would consider the POR-15 more of a coating then a paint. You can brush it on, but I typically used a foam brush. You can kind of just dab it on and it smooths out pretty nicely ... almost self leveling in a way. I'm hoping to get a good portion completed this weekend.
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  3. #3
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    That was pretty clean underneath for a Michigan car.

    That looks like it's coming out really nicely so far.
    It's Gumby's fault.

  4. #4
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    Quote Originally Posted by Tbird232ci View Post
    That was pretty clean underneath for a Michigan car.

    That looks like it's coming out really nicely so far.
    Thanks. I spent a lot of time cleaning it up and there are worse areas than those on the trunk well. Sucks, but hopefully I can get it addressed and then won't have to deal with it again. Car doesn't see snow anymore and only sees water to get washed ... so I'm hoping this holds up for a long time to come.

  5. #5
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    Today's progress thus far ... made it over to the passenger's side ... pluggin' away.
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  6. #6
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    that house shaped stamping into the trunk area,,

    thats the part you cut out and convert it into a water tight hinged door.

    this way in the future you simply open it up from inside the trunk to go in after your fuel pump next time it goes bad. no more droping the tank

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