Morris Minor Owners Club

100s of thousands of Minis say you are wrong ampwhu!

Dryad wrote:I never had a problem with the engine stalling due to vapourisation but the clicking gets on my nerves, especially when I'm in slow moving traffic, so I'll be converting my Minor to a mechanical fuel pump just as soon as I can get one! I have to say, until earlier this year I had an Austin 1300 with a mechanical pump and I never had a problem with it, despite it being the original one fitted in 1973!

i've found that excessive ticking means it's got an air leak. it's sucking air as well as fuel.

ampwhu wrote: i've found that excessive ticking means it's got an air leak. it's sucking air as well as fuel.

It ONLY ever does it when I've been stuck in slow moving traffic for more than about 3 minutes. My first Minor used to do exactly the same thing as well. I was told it was because the heat from the engine/exhaust vapourises the fuel in the carb float chamber.

bmcecosse wrote:100s of thousands of Minis say you are wrong ampwhu!

silly me. your never wrong.

The vapourisation occurs in the suction line - because the high mounted electric pump has to 'suck' hard to lift the fuel up from the low mounted tank - this puts the fuel in the line under a lower pressure than atmosphere - and so it can 'vapourise' more easily (esp in warm conditions) forming gas - which the pump can't move. The lower mounted mechanical pump (or indeed a low mounted electric pump) eliminates all these worries.

stuck in slow moving traffic for more than about 3 minutes

South Norfolk can't have much traffic, it would be undrivable in the smoke.

MarkyB wrote:

stuck in slow moving traffic for more than about 3 minutes

South Norfolk can't have much traffic, it would be undrivable in the smoke.

Long Stratton on the A140 has mile long tailbacks during rush hour, and Norwich city centre is a nightmare after 4.30pm.

I get upset if there are more than 3 cars in front of me at the lights.............