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AWD Fuel Pump Sending Unit - sealing around wires V70-XC70 1998

Hello folks,

I recently did the dreaded AWD fuel pump job. It was a long haul, but I did get it done and it's working well. Described here: http://www.brickboard.com/AWD/volvo/1360913/V70/help_start.html

Unfortunately, when I was taking everything apart, the little plug for the fuel pump power/ground wires busted off (it must have been cracked/weak before) and so I drilled a hole in the top of the assembly (the part that plugs the tank up when installed) to thread my new power/ground wires in.

I have had a terrible time sealing this hole up!

The first time I used silicone because it was the best I had on hand. I figured it would last a couple of days until I got some real gas tank sealer stuff, but it didn't even last that long. It did buy me enough time to get to Canadian Tire and buy some Permatex gas tank repair epoxy.

But I have not been able to seal it up using this either. I tried both the 'stick' style where you mash the two parts of the stick together to form an epoxy paste/dough and mash that in to seal thing up.
http://www.permatex.com/products/Automotive/specialized_maintenance_repair/radiator_fuel_tank_repair/Permatex_Instant_Gas_Tank_Repair.htm
I think it sealed to the metal part but leaked around the wires.

I then tried another Permatex product that is more liquid - again an epoxy that you mix together, this time applied with a little brush.
http://www.permatex.com/products/Automotive/specialized_maintenance_repair/professional_repair_systems/Permatex_Fuel_Tank_Repair_Kit.htm
I had to apply it over top of the old stuff, which is now hard as a rock and bonded well to the metal. I was sure I had it this time, but I see it's still leaking a bit, though not as much.

I need some help!

Should I try to seal it again with more of this Permatex stuff (I have lots of the 'stick' stuff left)?

Should I stop right now and take it to a gas tank repair place? Will they be able to help me? Do they have better sealants than the Permatex epoxy stuff?

Has anyone ever done anything like this before?

Any other products/methods to look at?
--
1998 V70 AWD Turbo 195k+








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    AWD Fuel Pump Sending Unit - sealing around wires V70-XC70 1998

    I think I might finally have this under control. I was very discouraged there for a while, but it seems to be sealed up properly now.

    I am going to recommend against drilling through that plug/cap if at all possible. If you can get the power through without removing/drilling then do it. It was not possible in my case as the plastic plug broke off...

    I went through two sticks of the permatex mash-together epoxy repair stuff.

    Here's my advice for using this stuff:

    - clean your hands well. Any dirt/grease/etc on your hands will quickly contaminate the material and make it not mix as well and not be as sticky.

    - clean your work. Same thing as with your hands - any dirt etc will get into this stuff quickly.

    - it's not very sticky to begin with so be sure to really mash it in to the places you need it to go so that it contacts all surfaces properly.. But don't mash it too thin or it won't seal anything either.

    - don't work it too long - it starts to harden after a couple of minutes, and it turns crusty and flaky. You want it all applied before this happens.

    - use lots of it. Don't be afraid to buy two sticks. I mixed in little batches of about 1/2 inch pieces of the stick so I could get it applied before it started to set up.

    - I think the liquid stuff worked better around the wires than the past/stick stuff. In general I think the liquid stuff was better, but you have to apply it REALLY fast, as it clumps up quickly. And it gets REALLY hot, so either wear a glove with the hand holding the pouch or find some way to hold it close without coming into close contact with your skin. Man this stuff gets hot!

    If this holds up until tomorrow I'll button the whole thing up.
    --
    1998 V70 AWD Turbo 195k+








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      AWD Fuel Pump Sending Unit - sealing around wires V70-XC70 1998

      I am still waiting for a few words on how you got the pump out.

      With all of that sticky stuff, you will need a hammer and chisle next time :)

      Klaus
      --
      The more I learn, the more I forget. So why learn?








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        AWD Fuel Pump Sending Unit - sealing around wires V70-XC70 1998

        THe epoxy is only on the assembly itself, so it slides in and out of the tank no problem.

        And go***mn this stuff dries hard! It's like metal!
        --
        1998 V70 AWD Turbo 195k+







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