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Heat Shrink Application - Inside Fuel Tank

Sarumatix

By Sarumatix,
in General Maintenance

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Sarumatix Veteran

Sarumatix

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I did something really stupid and cut the power cables inside the fuel tank to the fuel pump on the plug to the Walbro pump. Given that it has a harness rather than just direct wire on terminals like the Bosch units I had installed in the past :) I can't see any way to fix it without soldering bare cable which will be inside the tank. The risk of shorting is obviously a very serious problem so I will need to insulate it. Other than put the cable inside a piece of fuel hose, I thought there might be heat shrink that is resistant to fuel. I have found ISO 1817 heat shrink is what I need but I can't find any supplier in Victoria (Bursons, Pirtek and Repco). Any ideas?

In case you didn't know, petrol is very good a dissolving adhesives and breaking down a lot of plastics. I haven't tested the heatshrink I have as to whether it degrades but I am concerned that even after an hour it might not have changed, that doesn't necessarily mean it wont be effected 2 months later.

Aberax Grand Master

Aberax

Posted
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When i installed my Bosch 040, i extended the cables a little bit by soldering some extra on. I used heat shrink over the solder join, i checked the pump a few days later, and the heat shrink was still there. It should be fine, i got it from Supercheap Auto. If you really are concerned, get a glass jar, put some petrol in there with some heat shrink, put the lid on, and leave it a few days and see what happens.

tridentt150v Grand Master

tridentt150v

Posted
Posted

Replace the plastic on the joiner with fuel line rubber hose then. But those plastic covered crimps are OK, I've seen them used in some hostile environments and they are unaffected.

Aberax Grand Master

Aberax

Posted
Posted

The plastic crimps on joints SHOULD be fine, the wire inside the fuel tank is just normal electrical wire - I asked a Auto electrician before i did my 040 install. When i put the eyelets on my wire, it did have the plastic crimps on there, but i cut them off and soldered the wires to the eyelets as i wanted maximum connection, also didn't want them dissolving.

Sarumatix Veteran

Sarumatix

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The sample in fuel didn't degrade over night. So I used heatshrink and then cable tied a piece of fuel hose over the top as well. I will take it off and inspect in a few months to make sure it's all hunky dory :).

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