Yepper this is Charlie, Formerly Charlies84380SE.
I got Mariah the '89 560 SEC in March and the Bluebird the '84 Euro 500 SEC in August.
I don't believe that CS's car has the Hydraulic suspension as an option.
That tube is you main fuel hose and it is leaking at the tank connection. It is either the hose or the fuel strainer seal.
Either way, Enrique should be able to help you. I'd replace the hose and the strainer seal and have him clean the strainer(which he will anyway I'm sure).

I forget how far you are from Enrique's but if it isn't too far(25 miles) you'd probably be OK to drive it. You have driven it(the last time out) without a problem, Right?

Put on the parking brake, start the car up, put(leave) shifter in park, then look under there when it's running to see if you see gasoline coming out. My guess is not leaking when running, but, leaking when shut off and there is a bit of pressure in the tank.....

IF it isn't leaking when running, then you can drive it to Enrigue's.

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1986 Euro 500SEC "RUF" 9:1CR, "Rose"
1985 Euro 500SEC Cabriolet AMG Widebody
1982 Euro 500SEL "Blue"
2001 Texas Heeler (Aussie/Queensland X) "Sulphie",
2012 Queensland Red Heeler "Squeak"
Best dogs I've ever had.