return line to gas tank

[Shannen Durphey]

mrvette wrote:
> 
> Nah, I can attest with my'72 vette that the reutren line on a full tank of gas
> tends to heat up the gas, and expand the tank, forcing a leak conditon....when
> the tank is somewhat enptied,  the fumes disappear....
> believe me I have monitored this condition VERY carefully over the 3 years this
> mod with DPFI has been in effect, and tried all sorts of thigs....it's not
> really a leak, just escaping fumes...a real pain in the ass....you know the cold
> gas goes through the warming of the FI rails on the engine, and goes back heated
> to the tank,  gradually it all heats up, and forces gasses to escape,,.....the
> old type of evap canister, allthough operationg correctly is not up to the job,
> hence the late model FI cars have a bunch of capillary tubes in the system...
> a real weird piece of engineering, of which I have no knowledge....
> anyone out there who knows of these things....?
> 
I have the same problem on my 57 pickup, only worse (for me) because
the tank is in the cab.  My solution is to put a small power steering
cooler in the fuel return line.  Chevy cavaliers were some of the
first GM cars that I know of with a "spring loaded" sending unit. 
That way the pump stays in the fuel when the tank expands.
Shannen