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What's the easiest way to seal a fuse box leak?


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What's the easiest way to seal a fuse box leak? I have water leaking in through the firewall onto the backside fuse box and running in. I'm 100% sure that this has been the cause of many electrical issues / gremlins that I have been having. I was thinking that a few good coatings of RTV on the fuse box seam on the inside of the engine bay compartment should do the trick. Who has done this or who has a better fix? More to follow later.

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If yours is a 5 speed, it's more likely a leaking clutch master cylinder than leakin at the firewall.

 

That said, unbolt the bulkhead connector (1/4" bolt in the middle from the engine bay side, and two gold colored phillips heads on the firewall), pull it out, silicon the sealing edges after you remove any rust from the firewall, and put it back together.

 

 

Disconnect the battery just for safety

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Gotcha!

FYI... I was able to duplicate the leak prior to my posting the original question by spraying that side of the vehicle with a hose. I could see the water dripping in from the firewall side just above the fuse box and running down the fuse box on the inside. Question is this.....when refering to the clutch master cylinder leaking is everyone saying that the actual leak is a leaky clutch master cylinder or that the leak is a water leak coming from behind where the cylinder mounts?

I am going to take your advice and do what you said to do, as well as sealing around the firewall side of the fusebox (the top, bottom and both sides). I also found a factory made hole (that is plugged with some seam sealer) that has a hole in the sealant...it's on the vertical part of the floorboard, almost behind the brake pedal. There is a pin hole size hole that some dripping was also observed from.

So....any other input would be appreciated.

Thanks

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  • 9 months later...

 

That said, unbolt the bulkhead connector (1/4" bolt in the middle from the engine bay side, and two gold colored phillips heads on the firewall), pull it out, silicon the sealing edges after you remove any rust from the firewall, and put it back together.

 

 

 

Are you talking about the fuse box itself? Because I have this same problem. I sprayed some water on the fuse box under the hood, moved inside and saw water coming down the back side of the fuse box..

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:smart: Just a reminder about RTV silcone sealant ....Do not use acedic cure (type 1-smells like vinegar ) on anything electrical . Use only neutral cure (type 2-very little odor ) as the curing will not corrode elec. connecters , also adheres to plastics better. :thumbsup:

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  • 3 months later...
  • 8 years later...
If yours is a 5 speed, it's more likely a leaking clutch master cylinder than leakin at the firewall.
 
That said, unbolt the bulkhead connector (1/4" bolt in the middle from the engine bay side, and two gold colored phillips heads on the firewall), pull it out, silicon the sealing edges after you remove any rust from the firewall, and put it back together.
 
 
Disconnect the battery just for safety
Thanks for this! My (new to me) 92 is leaking from the behind fuse (it's raining right now, and i can see the drips coming in plus some previous work done to try to seal it).

Sent from my SM-G965U using Tapatalk

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  • 6 months later...

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