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MG MGA - fuel pump in/out elbows

Should the brass compression ferrule be a sliding fit on the shaft of the fuel pump inlet and outlet elbow?

Thanks!

George
George G.

It is sliding fit when it's new.

Once the compression nut is tightened the ferrule gets crushed down onto the tube.

If the pipe is very strong and rigid, like a polished thick wall steel pipe, it is possible that the ferrule could compress to make the seal, but spring back a tiny amount when released to be free and slide off the pipe (barely).

If the tube is soft enough, like copper or brass tubing, the tube itself may get crushed a bit to become wasp waisted, in which case the ferrule will never come off without being cut.

In most cases you can expect the ferrule to become one with the tube after first installation.
barneymg

So, it seems the ferrule on the fuel pump elbow should not be reused (I was able to remove mine, although they were tight)...? And, a spare fuel pump for the car should have new elbows attached....?
George G.

There will be four olives on the MGA fuel pump connections, one between the elbow and pump, and one between pipe and elbow, times two for inlet and outlet.

They can be reused, as long as you don't remove the olive from the pipe. When first assembled the olive will be crushed onto the pipe, intended to become one with the pipe. Thereafter it works like a brake line flare fitting, secured in place by the cap nut, and sealing between the tapered nose of the olive and the tapered seat in the mating fitting.
barneymg

I have replaced fuel pumps many times on various cars using the existing elbows. New elbows have new olives as part of the assembly.

I just looked at a new supply pipe (tank to pump) and the pump end already has the nut and a cone end silver soldered to the pipe, so no olive to replace there either.
Dominic Clancy

This thread was discussed between 07/08/2018 and 11/08/2018

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