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MG MGB Technical - replacing tubing between fuel pump and fuel line

I need to replace perished tubing (flexible hose) between the fuel pump and the fuel line to the engine. Apart from jacking up the car to gain access to the tubing, can I expect to find any problems when I come to replace the tubing ( I am renewing the clips at the same time)
Cheers

Stuart
si robathan

What year?

Unless you can leave the car for several hours without turning on the ignition before you start, run the engine for a while with the 12v feed wire to the fuel pump disconnected to lower the float chamber level and stop fuel running back from the front.

If chrome bumper you could well find fuel siphoning out from the pump via the tank as the fittings are usually below fuel level, unless the tank level is very low and you can raise the right rear corner quite a bit. If rubber bumper you should be fine, I've just changed one and got barely a drop out.

Chrome bumper usually come with the banjo fitting on the hose, but you can remove the hose from that and just replace the hose.

Make sure you get fuel grade hose (should be 5/16" in all cases), and if using worm clips make sure at their widest opening they are loose on the ends of the hose, but only just so. If they start off too loose you may not be able to tighten them up enough, being such a small diameter, but if you have to push them on when the hose isn't on the pipe, then when the pipe is in the hose which makes it bigger you may have difficulty getting the clips to the ends of the hose. Spring clips are actually preferable, much easier to fit, and apply a constant pressure as the hose deforms, unlike worm clips which will need retightening at some point.

Hopefully the metal pipe will be sound, although on a pals car it was the metal pipe between tank and pump that had rotted.
PaulH Solihull

Thanks Paul,
Yes I should have stated the year which is 1978, GT model. It is interesting to note the possibility of the syphoning action as it is still very wet around that area even though the car has been standing for a week (I have been away in Cornwall ), so that could be the reason that it is still wet. It is the bumper model. I did guess at the diameter of tubing needed as 3/16th so I will get 5/16th (£3.99!!)as a precaution. Many thanks for the advice I will post my progress on Monday.
Thanks
Stuart
si robathan

My pals wasn't wet in that area when I changed it, but then that was probably because he had run out of petrol just round the corner because of the leak!
PaulH Solihull

Si - Remove (or just loosen) the fuel line fitting at the fuel tank to prevent siphoning fuel out of a full tank. The only fuel that will spill out is what is in the line itself - same with the line from the pump to the carburetors. An oil catch pan is sufficient to catch whatever fuel is in the lines. Cheers - Dave
David DuBois

Thnaks everyone, job done with your help and advice. While at it I noticed the hose between the on-line fuel filter was also perished so replaced it at the same time
si robathan

This thread was discussed between 11/09/2010 and 13/09/2010

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