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| | | Condensation under floor mat above fuel tank | Joined: Apr 2018 Posts: 18 stranger | OP stranger Joined: Apr 2018 Posts: 18 | 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 | | | Re: Condensation under floor mat above fuel tank | Joined: Jun 2010 Posts: 18,286 Likes: 557 | Joined: Jun 2010 Posts: 18,286 Likes: 557 | 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 | Joined: Nov 2013 Posts: 2,285 Likes: 153 veteran | veteran Joined: Nov 2013 Posts: 2,285 Likes: 153 | 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 | Joined: Apr 2018 Posts: 18 stranger | OP stranger Joined: Apr 2018 Posts: 18 | Has a rear heater but that's not leaking. No rear A/C unit
1990 GMC Sport Rally STX 4X4 Monster Van | | | Re: Condensation under floor mat above fuel tank | Joined: Mar 2011 Posts: 513 Likes: 55 addict | addict Joined: Mar 2011 Posts: 513 Likes: 55 | 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 | Joined: Apr 2018 Posts: 18 stranger | OP stranger Joined: Apr 2018 Posts: 18 | 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 | | | Re: Condensation under floor mat above fuel tank | Joined: Apr 2004 Posts: 2,027 Likes: 51 veteran | veteran Joined: Apr 2004 Posts: 2,027 Likes: 51 | 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. | | |
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