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MG MG Y Type - Leaking Fuel Pump

Getting UHK 111 ready for a rally on Saturday I noticed a strong smell of petrol coming from near the fuel pumps. I found one dripping wet with petrol and evidence of the other having leaked in the past (part of the wiring loom below the pump had lost its insulation as had one wire in the loom whose core was exposed!). The fuel pumps also tick excessively when ignition is switched on and continue to tick even after the pumps are charged. I thought that might signify an air leak? Might that leak also lead to a leak of petrol? When I dried out the pumps and ran the car for five minutes I could see no leak and indeed things stayed dry. Might it only be happening when the pumps are getting charged at first ignition after a while standing? What is the most likely source of the leak? The filter at the bottom? Thanks.

Marc Hanson

Check the metal braided fuel lines to the carb(s) - the inner part is rubber and it deteriorates when the car is out of use for a while, so replace this/these. The only other would be the various joints (carb to fuel hose) and where the petrol pipe connects - sometimes a bit of PTFE tape helps. Also check that fuel does not leak from the bottom of the carb(s).When its all dry sprinkle chalk dust on the area and look for leaks. If the fuel pump ticks over excessively it's either an air leak or a fuel leak somewhere. Check the carb overflow pipe too.
D MULLEN

Thanks for your comments. The leak was coming from the filters under the pumps and stopped when these were tightened up. Presumably these were letting air in as well as the ticking has now settled down too.
Marc Hanson

David

I love the simplicity of the chalk dust idea - that is great as I have a car in at the moment that is loosing brake fluid but cannot find from where!

If you cannot get hold of enough chalk dust I am guessing you could actually use baking flour too.

On a Y that would of course have to be SELF RAISING FLOUR because the Y has the Jackall system!

Paul
Paul Barrow

This thread was discussed between 04/08/2010 and 12/08/2010

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