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MG MGB Technical - Pipes in the trunk???

I was working on the trunk of my 1971 B and noticed something that doesn't look like it belongs there.

Theres a small T fitting that comes through the bottom of the floor but has nothing connected to it. Then theres another small hose that has a T on it. This looks like aquarium hose size and fittings.

At least one of these routes under the right seat through a flexible rubber hose that looks original. I lost the pipe under the firewall and then got called away.

Anybody have any ideas what this is?

Thanks,

Rob
R Gallagher

I believe that this is a vent line for the fuel pump. midgets have similar fittings.
Bill Young

Bill is right. I've never really understood why these pipes were fitted. It comes from the cap of the fuel pump and terminates in the T-piece in the trunk as you say. For years it wasn't connected on my car either at the pump or the T-piece. Didn't notice any difference.

Mike H
Mike Howlett

The plumbing is for the two vents on the fuel pump (one on the end cover and one at the base of the coil housing. The only purpose that they serve is to route the vent into the trunk, where the atmosphere is somewhat dryer than under the car. Probably the majority of cars do not have the vent tubing any longer and I have not seen any detrimental effects on any of the pumps (the one exception to that is a pump I just restored for someone in Southern California, where he tried to play submarine commander with his MGB this winter on flooded roads - there was considerable fresh rust under the end cover of his pump). The only other purpose the vent tubing serves (and I don't know if this was a design consideration or a unintended consequence) is to provide a long enough column of air that there is no air exchange under the end cover, only a movement of the same air back and forth. This would insure a non combustable atmosphere under the end cover in case of a leaky diaphragm resulted in gas fumes accumulating under the cover. Cheers - Dave
David DuBois

Thanks guys!

I couldn't find it in any of my manuals/workshop books or catalogs.

Rob
R Gallagher

I have these in my 67 BGT.
Bruce Cunha

Well, well I found the same T piece and a hose in my trunk with a piece of hose hanging under the car now we know.
Henri
Henri Van Groningen

This thread was discussed between 20/06/2005 and 21/06/2005

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