[DeTomaso] Fuel tank ventilation - fuel spill

[Mike Drew]

Hartwig,

The vent hose originally ran across the engine bay beneath the rear window, into a charcoal canister.  Another hose ran from that canister to the engine, although at the moment I can’t quite remember what the scheme was. Was the engine also vented to the canister? Or was the canister providing vacuum that drew fumes from the tank, through the canister and into the engine, as modern cars do?

In any case, if you disconnect the vent hose from the canister and instead just point it at the ground, in certain rare circumstances, when the tank is completely filled, it can actually siphon the engine tire contents onto the ground! (I’ve only heard of that happening once). 

My car had an aluminum 1971 tank in it and used to dump fuel all the time. I discovered that the top of the tank where the vent is attached was very thin, and it was distorted by the attaching rivets, preventing a proper seal. As the vent is below the top of the tank (which is stupid), it is submerged when the tank is completely full. I know you have a 1971 car—is it early enough to have an aluminum tank also? (They are wrapped in fiberglass, ostensibly to prevent leaks). 

Mike

Sent from my iPad

> On Mar 6, 2022, at 07:41, HARTWIG ASSHAUER via DeTomaso <detomaso at server.detomasolist.com> wrote:
> 
>    Hi fromA Toulouse (France),
>   I noticed for quite some time that there is often a significant fuel
>   smell in the garage after having driven my Pantera. After some recent
>   investigation I found that the underside of the car was partially wet
>   from fuel that was releasedA from the fuel tank venting hose. That does
>   not look normal, right? Does the fuel tank venting have some device
>   installed that prevents liquid fuel leaving the tank?
>   Cheers
>   Hartwig
> 
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