What could these hoses be for?
 

There are these hoses running underneath the Blazer, one end is not attached, rear of driver's side, and then goes into fitting and then works across to the other side, where it disappears above frame, so can't see what it goes to.

Any ideas what it could be for? The truck was used for camping I believe.

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Re: What could these hoses be for?
 

Augsilery spelling fuel tank or part of the evaporation system , but my guess is on the extra tank, does it have a switch by the drivers side floorboard

Re: What could these hoses be for?
 

That was one of our guesses, but no extra tank or evidence of one being mounted to be found?

Does anyone have a pic of switch I could be looking for?

Re: What could these hoses be for?
 

Here is a thread with some pictures and info.

Link: https://67-72chevytrucks.com/vboard/...el+tank+switch

Re: What could these hoses be for?
 

So after the responses here, went researching, so when I went to truck today have another look around.

Found the switch on the riser between front floor and rear floor

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Unable to get in to truck as is on a 2 post hoist, but thinking this toggle switch on bottom of dash might be for switching feed for fuel gauge

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The only place I think auxiliary tank was mounted was in rear of cabin, with hose going through hole in floor. Again couldn't gain acess to see if there are signs of mounting under carpet

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So will have a further poke around when I get truck back, but will probably leave alone and redo fuel lines when we remove body.

If anyone has seen a system like this one, let me know