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Condensation under floor mat above fuel tank #738314
July 16th 2018 10:07 am
July 16th 2018 10:07 am
Joined: Apr 2018
Posts: 18
NW Washington
KaijuHunter Offline OP
stranger
KaijuHunter  Offline OP
stranger
Joined: Apr 2018
Posts: 18
NW Washington
Hello, I have a unique situation. In the back of the van (1990 GMC Rally STX) the floor mat above the fuel tank keeps getting damp. It's only slightly damp and I've had the entire floor mat out and dried it completely, put it back it, and after a couple of drives it wet again. No rain to speak of and the van is parked in a garage.

Anyone else ever seen this in their van?


1990 GMC Sport Rally STX 4X4 Monster Van
[Linked Image]
Re: Condensation under floor mat above fuel tank [Re: KaijuHunter] #738318
July 16th 2018 10:24 am
July 16th 2018 10:24 am
Joined: Jun 2010
Posts: 13,711
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 13,711
Van Diego California
Does it have a rear heater ?


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: Condensation under floor mat above fuel tank [Re: frscke1] #738333
July 16th 2018 3:58 pm
July 16th 2018 3:58 pm
Joined: Nov 2013
Posts: 1,002
West Texas
W
Wedgy Online content
old hand
Wedgy  Online Content
old hand
W
Joined: Nov 2013
Posts: 1,002
West Texas
Originally Posted by frscke1
Does it have a rear heater ?


Or a leaky condensation drain from a rear air unit above the back doors?

Re: Condensation under floor mat above fuel tank [Re: KaijuHunter] #738381
July 18th 2018 11:53 am
July 18th 2018 11:53 am
Joined: Apr 2018
Posts: 18
NW Washington
KaijuHunter Offline OP
stranger
KaijuHunter  Offline OP
stranger
Joined: Apr 2018
Posts: 18
NW Washington
Has a rear heater but that's not leaking. No rear A/C unit


1990 GMC Sport Rally STX 4X4 Monster Van
[Linked Image]
Re: Condensation under floor mat above fuel tank [Re: KaijuHunter] #738407
July 18th 2018 7:30 pm
July 18th 2018 7:30 pm
Joined: Mar 2011
Posts: 315
NY
J
jcd74 Offline
enthusiast
jcd74  Offline
enthusiast
J
Joined: Mar 2011
Posts: 315
NY
Check the temp of the floor the next time you drive it, is the area warm? Hot fuel returning from the engine warming up tank attracting moisture, tank cools condenses moisture? Exhaust leak around tank heating floor same thing? How is the humidity by you?

Re: Condensation under floor mat above fuel tank [Re: KaijuHunter] #738434
July 19th 2018 10:27 am
July 19th 2018 10:27 am
Joined: Apr 2018
Posts: 18
NW Washington
KaijuHunter Offline OP
stranger
KaijuHunter  Offline OP
stranger
Joined: Apr 2018
Posts: 18
NW Washington
I'll check the temp of the floor the next time I drive it and also look for any exhaust leaks too. I'll report back what I find.


1990 GMC Sport Rally STX 4X4 Monster Van
[Linked Image]
Re: Condensation under floor mat above fuel tank [Re: KaijuHunter] #738436
July 19th 2018 10:57 am
July 19th 2018 10:57 am
Joined: Apr 2004
Posts: 1,711
Ireland
shaggy Offline
veteran
shaggy  Offline
veteran
Joined: Apr 2004
Posts: 1,711
Ireland
The 70s tanks aren’t welded in place. I’ve removed mine (79 G30) before and it is just held on b the tank straps. I have no info on if a swap is possible though.


79 chevy G30 cobra camper conversion.
[Linked Image]

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