Fuel accumulator substitution

[prebordao]

I've just got a new fuel accumulator to replace the old one on my 74' 911S, but the new one has a small exit tube at the end (opposite to the 2 main fuel lines), which the old one doesn't seem to have...

What's it used for ? Where should I plug it ?

Thanks
Paulo

[don gilbert]

paulo, that is a later model accum. the bottlom hose was fitted back to the return fuel line going back to the tank, so incase of a ruptured diaphram, the fuel would not leak on hot parts. you can leave it be or just run a line down low and vent it to atmosphere.

[prebordao]

Thanks, it does make sense.

[cmonref]

Leaving it unplugged or vented overboard is an invitation to a disaster when the diaphram ruptures. Get the right fitting to cap it off, or figure out how to plumb it into the return line.

[don gilbert]

yeah paulo, dont vent it over the heat exchangers,duh